[llvm] r222039 - Reapply r221924: "[GVN] Perform Scalar PRE on gep indices that feed loads before
bmakam at codeaurora.org
bmakam at codeaurora.org
Mon Nov 24 09:32:23 PST 2014
Thanks Manman,
I will try to build libcxx and reproduce it.
Thanks again,
Balaram
>
> I got the same error with the new patch.
> 0 0 clang clang 0x0000000102b8e259
> 0x0000000106d9c259 llvm::sys::PrintStackTrace(__sFILE*) + 57
> llvm::sys::PrintStackTrace(__sFILE*) + 57
> 1 clang 0x0000000106d9cdab 1 SignalHandler(int) clang
> 0x0000000102b8edab + 347
> SignalHandler(int)2 + 347 libsystem_platform.dylib
> 0x00007fff8ad0af1a _sigtramp2 + 26
> libsystem_platform.dylib3 0x00007fff8ad0af1a libsystem_platform.dylib
> 0xffffffffffffffff_sigtramp + 26_sigtramp
> + 1966035199
> 3 libsystem_platform.dylib 0xffffffffffffffff _sigtramp + 1966035199
> 4 libsystem_c.dylib 0x00007fff8eafbb73 abort + 129
> 4 libsystem_c.dylib 5 0x00007fff8eafbb73 libsystem_malloc.dylib
> 0x00007fff8cdc0937abort + 129nano_size
> + 0
> 5 libsystem_malloc.dylib 0x00007fff8cdc0937 nano_size + 0
> 6 clang 0x00000001063f67a9 6 clang
> 0x00000001021e87a9 (anonymous
> namespace)::X86TTI::getIntImmCost(llvm::APInt const&, llvm::Type*) const +
> 601
> (anonymous namespace)::X86TTI::getIntImmCost(llvm::APInt const&,
> llvm::Type*) const + 601
> 7 clang 0x00000001063f5cc87 clang
> 0x00000001021e7cc8 non-virtual thunk to (anonymous
> namespace)::X86TTI::getIntImmCost(unsigned int, unsigned int, llvm::APInt
> const&, llvm::Type*) const + 216non-virtual thunk to (anonymous
> namespace)::X86TTI::getIntImmCost(unsigned int, unsigned int, llvm::APInt
> const&, llvm::Type*) const
> + 216
> 8 8 clang clang 0x00000001067b2323
> 0x00000001025a4323 (anonymous
> namespace)::ConstantHoisting::collectConstantCandidates(llvm::DenseMap<llvm::ConstantInt*,
> unsigned int, llvm::DenseMapInfo<llvm::ConstantInt*> >&,
> llvm::Instruction*, unsigned int, llvm::ConstantInt*)(anonymous
> namespace)::ConstantHoisting::collectConstantCandidates(llvm::DenseMap<llvm::ConstantInt*,
> unsigned int, llvm::DenseMapInfo<llvm::ConstantInt*> >&,
> llvm::Instruction*, unsigned int, llvm::ConstantInt*) + 211 + 211
>
> 9 9 clang clang 0x00000001067adce4
> 0x000000010259fce4 (anonymous
> namespace)::ConstantHoisting::runOnFunction(llvm::Function&)(anonymous
> namespace)::ConstantHoisting::runOnFunction(llvm::Function&) + 516 + 516
>
> 1010 clang clang 0x0000000106d22a25
> 0x0000000102b14a25
> llvm::FPPassManager::runOnFunction(llvm::Function&)llvm::FPPassManager::runOnFunction(llvm::Function&)
> + 549 + 549
>
> Manman
>
>> On Nov 21, 2014, at 3:57 PM, Balaram Makam <bmakam at codeaurora.org>
>> wrote:
>>
>> Hi Manman,
>>
>> Thanks for trying out.
>>
>> I agree that I need to reproduce the issue first but since I was not
>> able to reproduce the issue I inspected my code and found that call to
>> performScalarPRE should be guarded by the flags EnablePRE &&
>> EnableLoadPRE.
>> I assume when you initialize the pass manager in LTO you turn off
>> EnableLoadPRE flag, I suspect when the flag is off this could be an
>> issue but this is only speculation at this point since I cannot
>> reproduce your issue.
>>
>> Thanks,
>> Balaram
>>
>> From: Manman Ren [mailto:manman.ren at gmail.com]
>> Sent: Friday, November 21, 2014 6:39 PM
>> To: Balaram Makam; llvm-commits at cs.uiuc.edu
>> Subject: Re: [llvm] r222039 - Reapply r221924: "[GVN] Perform Scalar PRE
>> on gep indices that feed loads before
>>
>>
>> I locally applied your patch, its only difference from r222039 is:
>> Index: lib/Transforms/Scalar/GVN.cpp
>> ===================================================================
>> --- lib/Transforms/Scalar/GVN.cpp (revision 222239)
>> +++ lib/Transforms/Scalar/GVN.cpp (working copy)
>> @@ -1732,12 +1732,15 @@
>> }
>>
>> // If this load follows a GEP, see if we can PRE the indices before
>> analyzing.
>> - if (GetElementPtrInst *GEP =
>> dyn_cast<GetElementPtrInst>(LI->getOperand(0))) {
>> - for (GetElementPtrInst::op_iterator OI = GEP->idx_begin(),
>> - OE = GEP->idx_end();
>> - OI != OE; ++OI)
>> - if (Instruction *I = dyn_cast<Instruction>(OI->get()))
>> - performScalarPRE(I);
>> + if (EnablePRE && EnableLoadPRE) {
>> + if (GetElementPtrInst *GEP =
>> + dyn_cast<GetElementPtrInst>(LI->getOperand(0))) {
>> + for (GetElementPtrInst::op_iterator OI = GEP->idx_begin(),
>> + OE = GEP->idx_end();
>> + OI != OE; ++OI)
>> + if (Instruction *I = dyn_cast<Instruction>(OI->get()))
>> + performScalarPRE(I);
>> + }
>> }
>>
>> // Step 2: Analyze the availability of the load
>>
>> I don't quite get why this can fix the lto selfhost. You probably need
>> to reproduce the issue first.
>>
>> Manman
>>
>> On Fri, Nov 21, 2014 at 3:24 PM, Manman Ren <manman.ren at gmail.com
>> <mailto:manman.ren at gmail.com>> wrote:
>> Hi Balaram,
>>
>> I didn't do anything special about libcxx. All I did was "configure +
>> make".
>> Maybe someone else can help you with this error.
>>
>> I will try to very the patch today, it is going to lock up my computer
>> for 2 hours.
>> If I can't, I will try it after the Thanksgiving break.
>>
>> Manman
>>
>>
>> On Fri, Nov 21, 2014 at 11:58 AM, Balaram Makam <bmakam at codeaurora.org
>> <mailto:bmakam at codeaurora.org>> wrote:
>> Hi Manman,
>>
>> Could you please point me out how to build libcxx and libcxxabi on linux
>> to build lto selfhost?
>>
>> I keep getting the following error when trying to build libcxx and
>> libcxxabi:
>>
>> CMake Error at cmake/modules/HandleLLVMOptions.cmake:38 (message):
>> Host Clang must be able to find libstdc++4.7 or newer!
>>
>> Thanks,
>> Balaram
>>
>> -----Original Message-----
>> From: llvm-commits-bounces at cs.uiuc.edu
>> <mailto:llvm-commits-bounces at cs.uiuc.edu>
>> [mailto:llvm-commits-bounces at cs.uiuc.edu
>> <mailto:llvm-commits-bounces at cs.uiuc.edu>] On Behalf Of Hao Liu
>> Sent: Friday, November 21, 2014 2:25 AM
>> To: Manman Ren
>> Cc: llvm-commits at cs.uiuc.edu <mailto:llvm-commits at cs.uiuc.edu>
>> Subject: Re: [llvm] r222039 - Reapply r221924: "[GVN] Perform Scalar PRE
>> on gep indices that feed loads before
>>
>> Hi Manman,
>>
>> Unfortunately, I still have such build failures. It seems not related to
>> the source. Something must be wrong with my process.
>>
>> As you can easily reproduce it, maybe you can help Balaram to verify his
>> new patch,
>>
>> Thanks,
>> -Hao
>>
>> 2014-11-21 0:42 GMT+08:00 Manman Ren <manman.ren at gmail.com
>> <mailto:manman.ren at gmail.com>>:
>> > Hi Hao,
>> >
>> > Sorry about missing the step of acquiring source. What I did was
>> > trying to replicate what the build bot is doing.
>> >
>> > Yes, libcxx is part of the source acquiring. See
>> >
>> > http://lab.llvm.org:8080/green/job/clang-Rlto_master_acquire/514/conso
>> <http://lab.llvm.org:8080/green/job/clang-Rlto_master_acquire/514/conso>
>> > le
>> >
>> > for a list of projects.
>> >
>> > If you still have problem reproducing, let me know.
>> >
>> > Manman
>> >
>> > On Thu, Nov 20, 2014 at 2:49 AM, Hao Liu <Hao.Liu at arm.com
>> <mailto:Hao.Liu at arm.com>> wrote:
>> >>
>> >> Hi Manman,
>> >>
>> >>
>> >>
>> >> I tried your steps on the same revision as yours: r222239 at trunk. But
>> >> failed to reproduce it. Is it related to libc++ version? If so, what
>> >> revision is used in your test.
>> >>
>> >>
>> >>
>> >> I tired libc++ reversion of r222425 and r222425 and followed your
>> steps.
>> >>
>> >> But it had build failures on 1st step:
>> >>
>> >> llvm[2]: Linking Release+Asserts executable FileCheck (without
>> >> symbols)
>> >>
>> >>
>> >> build/utils/FileCheck/Release+Asserts/FileCheck.o:llvm/utils/FileChec
>> >> k/FileCheck.cpp:function llvm::cl::list<std::__1::basic_string<char,
>> >> std::__1::char_traits<char>, std::__1::allocator<char> >, bool,
>> >> llvm::cl::parser<std::__1::basic_string<char,
>> >> std::__1::char_traits<char>, std::__1::allocator<char> > >
>> >> >::~list(): error: undefined reference to 'operator delete(void*)'
>> >>
>> >> â¦
>> >>
>> >>
>> >>
>> >> Also I tried to configure without â--enable-libcppâ, both steps
>> were
>> >> finished. But can not reproduce the failures on fixxfti.c and
>> fixunsxfti.c.
>> >> So I think libc++ is necessary.
>> >>
>> >>
>> >>
>> >> Thanks,
>> >>
>> >> -Hao
>> >>
>> >>
>> >>
>> >> From: llvm-commits-bounces at cs.uiuc.edu
>> <mailto:llvm-commits-bounces at cs.uiuc.edu>
>> >> [mailto:llvm-commits-bounces at cs.uiuc.edu
>> <mailto:llvm-commits-bounces at cs.uiuc.edu>] On Behalf Of Manman Ren
>> >> Sent: Thursday, November 20, 2014 8:29 AM
>> >> To: Balaram Makam
>> >> Cc: llvm-commits at cs.uiuc.edu <mailto:llvm-commits at cs.uiuc.edu>
>> >>
>> >>
>> >> Subject: Re: [llvm] r222039 - Reapply r221924: "[GVN] Perform Scalar
>> >> PRE on gep indices that feed loads before
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> On Nov 19, 2014, at 3:46 PM, Balaram Makam <bmakam at codeaurora.org
>> <mailto:bmakam at codeaurora.org>> wrote:
>> >>
>> >>
>> >>
>> >> Hi Manman,
>> >>
>> >> I have a patch with a potential fix to the problem, but I cannot
>> >> reproduce the original failure with the preprocessed source files you
>> provided.
>> >>
>> >>
>> >>
>> >> Hi Balaram,
>> >>
>> >>
>> >>
>> >> You need to build a lto selfhost to reproduce.
>> >>
>> >>
>> >>
>> >> 1> make a release+assert build with your patch (install the compiler
>> >> 1> to a
>> >> directory clang-install for example).
>> >>
>> >>
>> >>
>> >> create directory clang-build and clang-install under llvm
>> >>
>> >> under clang-build, do:
>> >> ./llvm/configure --enable-assertions --enable-optimized
>> >> --disable-bindings --enable-targets=x86,x86_64 --enable-libcpp
>> >> --prefix=Users/manmanren/llvm/clang-install
>> >>
>> >> make -j 12 VERBOSE=1
>> >> CLANG_REPOSITORY_STRING=clang-stage1-configure-RA_build
>> SVN_REVISION=222059
>> >> make install-clang -j 4
>> >>
>> >>
>> >>
>> >> 2> use clang-install binary and library to build the same repo with
>> lto.
>> >>
>> >>
>> >> create directory selfhost, under selfhost, do:
>> >>
>> >> ../llvm/configure --disable-assertions --with-extra-options="-flto
>> >> -gline-tables-onlyâ --enable-optimized --disable-bindings
>> >> --enable-targets=x86,x86_64 --enable-libcpp
>> >> CC=/Users/manmanren/llvm/clang-install/bin/clang
>> >> CXX=/Users/manmanren/gmail/clang-install/llvm/clang++
>> >>
>> >>
>> >>
>> >> make -j 4 VERBOSE=1
>> >> CLANG_REPOSITORY_STRING=clang-Rlto_master_build
>> >> SVN_REVISION=222059
>> >> DYLD_LIBRARY_PATH=/Users/manmanren/llvm_gmail/clang-install/lib/
>> >>
>> >>
>> >>
>> >> The whole process takes a few hours to run.You can also commit the
>> >> patch if you are confident enough and then watch the bot (phase 2
>> lto).
>> >>
>> >>
>> >>
>> >> Manman
>> >>
>> >>
>> >>
>> >> Could you please test this patch (attached) and let me know if it
>> works?
>> >>
>> >> Thanks,
>> >> Balaram
>> >>
>> >>
>> >> -----Original Message-----
>> >> From: Chad Rosier [mailto:mcrosier at codeaurora.org
>> <mailto:mcrosier at codeaurora.org>]
>> >> Sent: Tuesday, November 18, 2014 9:09 PM
>> >> To: Manman Ren
>> >> Cc: mcrosier at codeaurora.org <mailto:mcrosier at codeaurora.org>;
>> llvm-commits at cs.uiuc.edu <mailto:llvm-commits at cs.uiuc.edu>; Balaram
>> Makam;
>> >> James Molloy
>> >> Subject: Re: [llvm] r222039 - Reapply r221924: "[GVN] Perform Scalar
>> >> PRE on gep indices that feed loads before
>> >>
>> >> Thanks, Manman. Balaram or another one of our team members will
>> >> investigate.
>> >>
>> >> Chad
>> >>
>> >>
>> >>
>> >>
>> >> Hi Chad,
>> >>
>> >> I reverted the commit in r222287.
>> >>
>> >> The lto self host of r222239 without this commit succeeded.
>> >> And I have finished the lto self host of r222239 including this
>> >> commit, it failed. If you need any more files, let me know.
>> >>
>> >> Thanks,
>> >> Manman
>> >>
>> >> clang(59539,0x7fff7c035300) malloc: *** error for object
>> 0x7fa438648450:
>> >> pointer being freed was not allocated
>> >> *** set a breakpoint in malloc_error_break to debug
>> >> COMPILE: clang_darwin/cc_kext/x86_64:
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/fixxfti.c
>> >> COMPILE: clang_darwin/cc_kext/x86_64:
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/x86_64/
>> >> f loatdidf.c /Users/manmanren/gmail/selfhost/Release/bin/clang -fPIC
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/lib
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/include -arch
>> >> x86_64 -fvisibility=hidden -DVISIBILITY_HIDDEN -mkernel -DKERNEL_USE
>> >> -Wall -Werror -O3 -fomit-frame-pointer -mmacosx-version-min=10.4
>> >> -isysroot
>> >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/
>> >> D
>> >> eveloper/SDKs/MacOSX10.10.sdk
>> >> -c -o
>> >> /Users/manmanren/gmail/selfhost/tools/clang/runtime/compiler-rt/clang
>> >> _ darwin/cc_kext/x86_64/SubDir.lib__builtins/fixxfti.o
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/fixxfti.c
>> >> COMPILE: clang_darwin/cc_kext/x86_64:
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/x86_64/
>> >> f loatdisf.c /Users/manmanren/gmail/selfhost/Release/bin/clang -fPIC
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/lib
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/include -arch
>> >> x86_64 -fvisibility=hidden -DVISIBILITY_HIDDEN -mkernel -DKERNEL_USE
>> >> -Wall -Werror -O3 -fomit-frame-pointer -mmacosx-version-min=10.4
>> >> -isysroot
>> >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/
>> >> D
>> >> eveloper/SDKs/MacOSX10.10.sdk
>> >> -c -o
>> >> /Users/manmanren/gmail/selfhost/tools/clang/runtime/compiler-rt/clang
>> >> _ darwin/cc_kext/x86_64/SubDir.lib__builtins__x86_64/floatdisf.o
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/x86_64/
>> >> f loatdisf.c /Users/manmanren/gmail/selfhost/Release/bin/clang -fPIC
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/lib
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/include -arch
>> >> x86_64 -fvisibility=hidden -DVISIBILITY_HIDDEN -mkernel -DKERNEL_USE
>> >> -Wall -Werror -O3 -fomit-frame-pointer -mmacosx-version-min=10.4
>> >> -isysroot
>> >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/
>> >> D
>> >> eveloper/SDKs/MacOSX10.10.sdk
>> >> -c -o
>> >> /Users/manmanren/gmail/selfhost/tools/clang/runtime/compiler-rt/clang
>> >> _ darwin/cc_kext/x86_64/SubDir.lib__builtins__x86_64/floatdidf.o
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/x86_64/
>> >> f
>> >> loatdidf.c
>> >> clang(59547,0x7fff7c035300) malloc: *** error for object
>> 0x7f9410f1c0d0:
>> >> pointer being freed was not allocated
>> >> *** set a breakpoint in malloc_error_break to debug
>> >> 0 clang 0x000000010c15d259
>> >> llvm::sys::PrintStackTrace(__sFILE*) + 57
>> >> 1 clang 0x000000010c15ddab SignalHandler(int) +
>> 347
>> >> 2 libsystem_platform.dylib 0x00007fff980faf1a _sigtramp + 26
>> >> 3 libsystem_platform.dylib 0xffffffffffffffff _sigtramp + 1743802623
>> >> 4 libsystem_c.dylib 0x00007fff982ccb73 abort + 129
>> >> 5 libsystem_malloc.dylib 0x00007fff98e7b937 nano_size + 0
>> >> 6 clang 0x000000010b7b77b9 (anonymous
>> >> namespace)::X86TTI::getIntImmCost(llvm::APInt const&, llvm::Type*)
>> >> const +
>> >> 601
>> >> 7 clang 0x000000010b7b6cd8 non-virtual thunk to
>> >> (anonymous namespace)::X86TTI::getIntImmCost(unsigned int, unsigned
>> >> int, llvm::APInt const&, llvm::Type*) const + 216
>> >> 8 clang 0x000000010bb73333 (anonymous
>> >> namespace)::ConstantHoisting::collectConstantCandidates(llvm::DenseMa
>> >> p
>> >> <llvm::ConstantInt*, unsigned int,
>> >> llvm::DenseMapInfo<llvm::ConstantInt*> >&, llvm::Instruction*,
>> >> unsigned int, llvm::ConstantInt*) + 211
>> >> COMPILE: clang_darwin/cc_kext/x86_64:
>> >>
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/x86_64/floatdixf.c
>> >> 9 clang 0x000000010bb6ecf4 (anonymous
>> >> namespace)::ConstantHoisting::runOnFunction(llvm::Function&) + 516
>> >> COMPILE: clang_darwin/cc_kext/x86_64:
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/floatti
>> >> d f.c /Users/manmanren/gmail/selfhost/Release/bin/clang -fPIC
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/lib
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/include -arch
>> >> x86_64 -fvisibility=hidden -DVISIBILITY_HIDDEN -mkernel -DKERNEL_USE
>> >> -Wall -Werror -O3 -fomit-frame-pointer -mmacosx-version-min=10.4
>> >> -isysroot
>> >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/
>> >> D
>> >> eveloper/SDKs/MacOSX10.10.sdk
>> >> -c -o
>> >> /Users/manmanren/gmail/selfhost/tools/clang/runtime/compiler-rt/clang
>> >> _ darwin/cc_kext/x86_64/SubDir.lib__builtins__x86_64/floatdixf.o
>> >>
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/x86_64/floatdixf.c
>> >> 10 clang 0x000000010c0e3a25
>> >> llvm::FPPassManager::runOnFunction(llvm::Function&) + 549
>> >> 11 clang 0x000000010c0e3c9b
>> >> llvm::FPPassManager::runOnModule(llvm::Module&) + 43
>> >> 12 clang 0x000000010c0e412a
>> >> llvm::legacy::PassManagerImpl::run(llvm::Module&) + 922
>> >> 13 clang 0x000000010a445430
>> >> clang::EmitBackendOutput(clang::DiagnosticsEngine&,
>> >> clang::CodeGenOptions const&, clang::TargetOptions const&,
>> >> clang::LangOptions const&, llvm::StringRef, llvm::Module*,
>> >> clang::BackendAction, llvm::raw_ostream*)
>> >> + 12208
>> >> 0 clang 0x00000001059d5259
>> >> llvm::sys::PrintStackTrace(__sFILE*) + 57
>> >> 14 clang 0x000000010a5cda44
>> >> clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) +
>> >> 516 /Users/manmanren/gmail/selfhost/Release/bin/clang -fPIC
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/lib
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/include -arch
>> >> x86_64 -fvisibility=hidden -DVISIBILITY_HIDDEN -mkernel -DKERNEL_USE
>> >> -Wall -Werror -O3 -fomit-frame-pointer -mmacosx-version-min=10.4
>> >> -isysroot
>> >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/
>> >> D
>> >> eveloper/SDKs/MacOSX10.10.sdk
>> >> -c -o
>> >> /Users/manmanren/gmail/selfhost/tools/clang/runtime/compiler-rt/clang
>> >> _ darwin/cc_kext/x86_64/SubDir.lib__builtins/floattidf.o
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/floattidf.c
>> >> 1 clang 0x00000001059d5dab SignalHandler(int) +
>> 347
>> >> 2 libsystem_platform.dylib 0x00007fff980faf1a _sigtramp + 26
>> >> 3 libsystem_platform.dylib 0xffffffffffffffff _sigtramp + 1743802623
>> >> 15 clang 0x000000010a6864c5 4 libsystem_c.dylib
>> >> 0x00007fff982ccb73 clang::ParseAST(clang::Sema&, bool, bool)abort +
>> >> 661 +
>> >> 129
>> >>
>> >> 5 libsystem_malloc.dylib 0x00007fff98e7b937 nano_size + 0
>> >> 16 clang 0x000000010a1f2b7e
>> >> clang::FrontendAction::Execute() + 62
>> >> 6 clang 0x000000010502f7b9 (anonymous
>> >> namespace)::X86TTI::getIntImmCost(llvm::APInt const&, llvm::Type*)
>> >> const +
>> >> 601
>> >> 17 clang 0x000000010a1ba8d3
>> >> clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 915
>> >> 7 clang 0x000000010502ecd8 non-virtual thunk to
>> >> (anonymous namespace)::X86TTI::getIntImmCost(unsigned int, unsigned
>> >> int, llvm::APInt const&, llvm::Type*) const + 216
>> >> 18 clang 0x000000010a16a3fa
>> >> clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 2890
>> >> 8 clang 0x00000001053eb333 (anonymous
>> >> namespace)::ConstantHoisting::collectConstantCandidates(llvm::DenseMa
>> >> p
>> >> <llvm::ConstantInt*, unsigned int,
>> >> llvm::DenseMapInfo<llvm::ConstantInt*> >&, llvm::Instruction*,
>> >> unsigned int, llvm::ConstantInt*) + 211
>> >> 19 clang 0x000000010a16000c
>> >> cc1_main(llvm::ArrayRef<char const*>, char const*, void*) + 1836
>> >> 9 clang 0x00000001053e6cf4 (anonymous
>> >> namespace)::ConstantHoisting::runOnFunction(llvm::Function&) + 516
>> >> 20 clang 0x000000010a168b21 main + 13745
>> >> 21 libdyld.dylib 0x00007fff8b4215c9 start + 1
>> >> 22 libdyld.dylib 0x0000000000000045 start + 1958603389
>> >> 10 clang 0x000000010595ba25
>> >> llvm::FPPassManager::runOnFunction(llvm::Function&) + 549 Stack dump:
>> >> 0. Program arguments:
>> >> /Users/manmanren/gmail/selfhost/Release/bin/clang
>> >> -cc1 -triple x86_64-apple-macosx10.4.0 -emit-obj -disable-free
>> >> -disable-llvm-verifier -main-file-name fixunsxfti.c -static-define
>> >> -mrelocation-model static -mthread-model posix -masm-verbose
>> >> -fforbid-guard-variables -target-cpu core2 -disable-red-zone
>> >> -no-implicit-float -target-linker-version 242 -dwarf-column-info
>> >> -coverage-file
>> >> /Users/manmanren/gmail/selfhost/tools/clang/runtime/compiler-rt/clang
>> >> _ darwin/cc_kext/x86_64/SubDir.lib__builtins/fixunsxfti.o
>> >> -resource-dir
>> >> /Users/manmanren/gmail/selfhost/Release/bin/../lib/clang/3.6.0
>> >> -isysroot
>> >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/
>> >> D
>> >> eveloper/SDKs/MacOSX10.10.sdk
>> >> -D VISIBILITY_HIDDEN -D KERNEL_USE -I
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib -I
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/include -O3 -Wall
>> >> -Werror -fdebug-compilation-dir
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt
>> >> -ferror-limit 19 -fmessage-length 164 -fvisibility hidden
>> >> -ffreestanding -mstackrealign -fno-builtin -fblocks
>> >> -fblocks-runtime-optional -fno-rtti -fno-use-cxa-atexit
>> >> -fobjc-runtime=macosx-10.4.0 -fobjc-dispatch-method=non-legacy
>> >> -fencode-extended-block-signature
>> >> -fmax-type-align=16 -fno-common -fdiagnostics-show-option
>> >> -fcolor-diagnostics -vectorize-loops -vectorize-slp -o
>> >> /Users/manmanren/gmail/selfhost/tools/clang/runtime/compiler-rt/clang
>> >> _ darwin/cc_kext/x86_64/SubDir.lib__builtins/fixunsxfti.o
>> >> -x c
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/fixunsxfti.c
>> >> 1. <eof> parser at end of file
>> >> 2. Code generation
>> >> 3. Running pass 'Function Pass Manager' on module
>> >>
>> >> '/Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/fixunsxfti.c'.
>> >> 4. Running pass 'Constant Hoisting' on function
>> '@__fixunsxfti'
>> >> 11 clang 0x000000010595bc9b
>> >> llvm::FPPassManager::runOnModule(llvm::Module&) + 43
>> >> 12 clang 0x000000010595c12a
>> >> llvm::legacy::PassManagerImpl::run(llvm::Module&) + 922
>> >> 13 clang 0x0000000103cbd430
>> >> clang::EmitBackendOutput(clang::DiagnosticsEngine&,
>> >> clang::CodeGenOptions const&, clang::TargetOptions const&,
>> >> clang::LangOptions const&, llvm::StringRef, llvm::Module*,
>> >> clang::BackendAction, llvm::raw_ostream*)
>> >> + 12208
>> >> 14 clang 0x0000000103e45a44
>> >> clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) +
>> 516
>> >> 15 clang 0x0000000103efe4c5
>> >> clang::ParseAST(clang::Sema&, bool, bool) + 661
>> >> 16 clang 0x0000000103a6ab7e
>> >> clang::FrontendAction::Execute() + 62
>> >> 17 clang 0x0000000103a328d3
>> >> clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 915
>> >> 18 clang 0x00000001039e23fa
>> >> clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 2890
>> >> 19 clang 0x00000001039d800c
>> >> cc1_main(llvm::ArrayRef<char const*>, char const*, void*) + 1836
>> >> 20 clang 0x00000001039e0b21 main + 13745
>> >> 21 libdyld.dylib 0x00007fff8b4215c9 start + 1
>> >> 22 libdyld.dylib 0x0000000000000045 start + 1958603389
>> >> Stack dump:
>> >> 0. Program arguments:
>> >> /Users/manmanren/gmail/selfhost/Release/bin/clang
>> >> -cc1 -triple x86_64-apple-macosx10.4.0 -emit-obj -disable-free
>> >> -disable-llvm-verifier -main-file-name fixxfti.c -static-define
>> >> -mrelocation-model static -mthread-model posix -masm-verbose
>> >> -fforbid-guard-variables -target-cpu core2 -disable-red-zone
>> >> -no-implicit-float -target-linker-version 242 -dwarf-column-info
>> >> -coverage-file
>> >> /Users/manmanren/gmail/selfhost/tools/clang/runtime/compiler-rt/clang
>> >> _ darwin/cc_kext/x86_64/SubDir.lib__builtins/fixxfti.o
>> >> -resource-dir
>> >> /Users/manmanren/gmail/selfhost/Release/bin/../lib/clang/3.6.0
>> >> -isysroot
>> >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/
>> >> D
>> >> eveloper/SDKs/MacOSX10.10.sdk
>> >> -D VISIBILITY_HIDDEN -D KERNEL_USE -I
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib -I
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/include -O3 -Wall
>> >> -Werror -fdebug-compilation-dir
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt
>> >> -ferror-limit 19 -fmessage-length 164 -fvisibility hidden
>> >> -ffreestanding -mstackrealign -fno-builtin -fblocks
>> >> -fblocks-runtime-optional -fno-rtti -fno-use-cxa-atexit
>> >> -fobjc-runtime=macosx-10.4.0 -fobjc-dispatch-method=non-legacy
>> >> -fencode-extended-block-signature
>> >> -fmax-type-align=16 -fno-common -fdiagnostics-show-option
>> >> -fcolor-diagnostics -vectorize-loops -vectorize-slp -o
>> >> /Users/manmanren/gmail/selfhost/tools/clang/runtime/compiler-rt/clang
>> >> _ darwin/cc_kext/x86_64/SubDir.lib__builtins/fixxfti.o
>> >> -x c
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/fixxfti.c
>> >> 1. <eof> parser at end of file
>> >> 2. Code generation
>> >> 3. Running pass 'Function Pass Manager' on module
>> >> '/Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/fixxfti.c'.
>> >> 4. Running pass 'Constant Hoisting' on function '@__fixxfti'
>> >> COMPILE: clang_darwin/cc_kext/x86_64:
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/floatti
>> >> s f.c /Users/manmanren/gmail/selfhost/Release/bin/clang -fPIC
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/lib
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/include -arch
>> >> x86_64 -fvisibility=hidden -DVISIBILITY_HIDDEN -mkernel -DKERNEL_USE
>> >> -Wall -Werror -O3 -fomit-frame-pointer -mmacosx-version-min=10.4
>> >> -isysroot
>> >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/
>> >> D
>> >> eveloper/SDKs/MacOSX10.10.sdk
>> >> -c -o
>> >> /Users/manmanren/gmail/selfhost/tools/clang/runtime/compiler-rt/clang
>> >> _ darwin/cc_kext/x86_64/SubDir.lib__builtins/floattisf.o
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/floatti
>> >> s
>> >> f.c
>> >>
>> >> COMPILE: clang_darwin/cc_kext/x86_64:
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/powidf2.
>> >> c /Users/manmanren/gmail/selfhost/Release/bin/clang -fPIC
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/lib
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/include -arch
>> >> x86_64 -fvisibility=hidden -DVISIBILITY_HIDDEN -mkernel -DKERNEL_USE
>> >> -Wall -Werror -O3 -fomit-frame-pointer -mmacosx-version-min=10.4
>> >> -isysroot
>> >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/
>> >> D
>> >> eveloper/SDKs/MacOSX10.10.sdk
>> >> -c -o
>> >> /Users/manmanren/gmail/selfhost/tools/clang/runtime/compiler-rt/clang
>> >> _ darwin/cc_kext/x86_64/SubDir.lib__builtins/popcountti2.o
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/popcoun
>> >> t ti2.c /Users/manmanren/gmail/selfhost/Release/bin/clang -fPIC
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/lib
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/include -arch
>> >> x86_64 -fvisibility=hidden -DVISIBILITY_HIDDEN -mkernel -DKERNEL_USE
>> >> -Wall -Werror -O3 -fomit-frame-pointer -mmacosx-version-min=10.4
>> >> -isysroot
>> >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/
>> >> D
>> >> eveloper/SDKs/MacOSX10.10.sdk
>> >> -c -o
>> >> /Users/manmanren/gmail/selfhost/tools/clang/runtime/compiler-rt/clang
>> >> _ darwin/cc_kext/x86_64/SubDir.lib__builtins/powidf2.o
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/powidf2.
>> >> c
>> >> clang: error: unable to execute command: Abort trap: 6
>> >> clang: error: clang frontend command failed due to signal (use -v to
>> >> see
>> >> invocation)
>> >> clang version 3.6.0 (clang-Rlto_master_build 222059) (llvm/trunk
>> >> 222239)
>> >> Target: x86_64-apple-darwin14.0.0
>> >> Thread model: posix
>> >> clang: note: diagnostic msg: PLEASE submit a bug report to
>> >> http://llvm.org/bugs/ <http://llvm.org/bugs/> and include the crash
>> backtrace, preprocessed
>> >> source, and associated run script.
>> >> COMPILE: clang_darwin/cc_kext/x86_64:
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/powisf2.
>> >> c /Users/manmanren/gmail/selfhost/Release/bin/clang -fPIC
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/lib
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/include -arch
>> >> x86_64 -fvisibility=hidden -DVISIBILITY_HIDDEN -mkernel -DKERNEL_USE
>> >> -Wall -Werror -O3 -fomit-frame-pointer -mmacosx-version-min=10.4
>> >> -isysroot
>> >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/
>> >> D
>> >> eveloper/SDKs/MacOSX10.10.sdk
>> >> -c -o
>> >> /Users/manmanren/gmail/selfhost/tools/clang/runtime/compiler-rt/clang
>> >> _ darwin/cc_kext/x86_64/SubDir.lib__builtins/powisf2.o
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/powisf2.
>> >> c
>> >> clang: note: diagnostic msg:
>> >> ********************
>> >>
>> >> PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
>> >> Preprocessed source(s) and associated run script(s) are located at:
>> >> clang: note: diagnostic msg:
>> >> /var/folders/8d/mksp0c9x6yngd578zj_s72ym0000gn/T/fixxfti-868934.c
>> >> clang: note: diagnostic msg:
>> >> /var/folders/8d/mksp0c9x6yngd578zj_s72ym0000gn/T/fixxfti-868934.sh
>> >> clang: note: diagnostic msg:
>> >>
>> >> ********************
>> >> COMPILE: clang_darwin/cc_kext/x86_64:
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/powixf2.
>> >> c
>> >> make[5]: ***
>> >> [/Users/manmanren/gmail/selfhost/tools/clang/runtime/compiler-rt/clan
>> >> g _darwin/cc_kext/x86_64/SubDir.lib__builtins/fixxfti.o]
>> >> Error 254
>> >> make[5]: *** Waiting for unfinished jobs....
>> >> /Users/manmanren/gmail/selfhost/Release/bin/clang -fPIC
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/lib
>> >> -I/Users/manmanren/gmail/llvm/projects/compiler-rt/include -arch
>> >> x86_64 -fvisibility=hidden -DVISIBILITY_HIDDEN -mkernel -DKERNEL_USE
>> >> -Wall -Werror -O3 -fomit-frame-pointer -mmacosx-version-min=10.4
>> >> -isysroot
>> >> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/
>> >> D
>> >> eveloper/SDKs/MacOSX10.10.sdk
>> >> -c -o
>> >> /Users/manmanren/gmail/selfhost/tools/clang/runtime/compiler-rt/clang
>> >> _ darwin/cc_kext/x86_64/SubDir.lib__builtins/powixf2.o
>> >> /Users/manmanren/gmail/llvm/projects/compiler-rt/lib/builtins/powixf2.
>> >> c
>> >> clang: error: unable to execute command: Abort trap: 6
>> >> clang: error: clang frontend command failed due to signal (use -v to
>> >> see
>> >> invocation)
>> >> clang version 3.6.0 (clang-Rlto_master_build 222059) (llvm/trunk
>> >> 222239)
>> >> Target: x86_64-apple-darwin14.0.0
>> >> Thread model: posix
>> >> clang: note: diagnostic msg: PLEASE submit a bug report to
>> >> http://llvm.org/bugs/ <http://llvm.org/bugs/> and include the crash
>> backtrace, preprocessed
>> >> source, and associated run script.
>> >> clang: note: diagnostic msg:
>> >> ********************
>> >>
>> >> PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
>> >> Preprocessed source(s) and associated run script(s) are located at:
>> >> clang: note: diagnostic msg:
>> >> /var/folders/8d/mksp0c9x6yngd578zj_s72ym0000gn/T/fixunsxfti-33f776.c
>> >> clang: note: diagnostic msg:
>> >> /var/folders/8d/mksp0c9x6yngd578zj_s72ym0000gn/T/fixunsxfti-33f776.sh
>> >> clang: note: diagnostic msg:
>> >>
>> >> ********************
>> >>
>> >>
>> >>
>> >> On Nov 18, 2014, at 2:53 PM, Chad Rosier <mcrosier at codeaurora.org
>> <mailto:mcrosier at codeaurora.org>>
>> >> wrote:
>> >>
>> >> Hi Manman,
>> >> Feel free to revert the patch if you're convinced this is the
>> problem.
>> >> Please keep Balaram, James, and I updated on the progress. This is a
>> >> performance critical fix, so we need to make sure it doesn't get lost
>> >> in the mix.
>> >>
>> >> Chad
>> >>
>> >>
>> >> Hi Chad,
>> >>
>> >> About the buildbot phase 2 failure, I now think this commit is the
>> >> root cause.
>> >>
>> >> What I did was:
>> >> 1> update the repo to r222239, then "svn merge -c -r222039 .â⬠,
>> made
>> >> 1> a
>> >> release+assert build (installed to clang-install).
>> >> 2> use clang-install binary and library to build the same repo with
>> >> lto.
>> >> make -j 4 VERBOSE=1
>> >> CLANG_REPOSITORY_STRING=clang-Rlto_master_build
>> >> SVN_REVISION=222059
>> >> DYLD_LIBRARY_PATH=/Users/manmanren/llvm_gmail/clang-install/lib/
>> >> 3> the build completed
>> >> make[1]: Nothing to be done for `all'.
>> >> make[1]: Nothing to be done for `all'.
>> >> llvm[0]: ***** Completed Release Build
>> >>
>> >> Is it okay for us to revert this commit and watch the bot? If the bot
>> >> is still red, we can re-submit it.
>> >>
>> >> If you want me to do more testing (maybe a lto self host with
>> >> r22239), let me know,
>> >>
>> >> Thanks,
>> >> Manman (The build czar)
>> >>
>> >>
>> >> On Nov 14, 2014, at 1:09 PM, Chad Rosier <mcrosier at codeaurora.org
>> <mailto:mcrosier at codeaurora.org>>
>> >> wrote:
>> >>
>> >> Author: mcrosier
>> >> Date: Fri Nov 14 15:09:13 2014
>> >> New Revision: 222039
>> >>
>> >> URL: http://llvm.org/viewvc/llvm-project?rev=222039&view=rev
>> <http://llvm.org/viewvc/llvm-project?rev=222039&view=rev>
>> >> Log:
>> >> Reapply r221924: "[GVN] Perform Scalar PRE on gep indices that feed
>> >> loads before doing Load PRE"
>> >>
>> >> This commit updates the failing test in
>> >> Analysis/TypeBasedAliasAnalysis/gvn-nonlocal-type-mismatch.ll
>> >>
>> >> The failing test is sensitive to the order in which we process loads.
>> >> This
>> >> version turns on the RPO traversal instead of the while DT traversal
>> >> in GVN.
>> >> The new test code is functionally same just the order of loads that
>> >> are eliminated is swapped.
>> >>
>> >> This new version also fixes an issue where GVN splits a critical edge
>> >> and potentially invalidate the RPO/DT iterator.
>> >>
>> >> Added:
>> >> llvm/trunk/test/Transforms/GVN/pre-gep-load.ll
>> >> Modified:
>> >> llvm/trunk/lib/Transforms/Scalar/GVN.cpp
>> >>
>> >> llvm/trunk/test/Analysis/TypeBasedAliasAnalysis/gvn-nonlocal-type-m
>> >> ismatch.ll
>> >>
>> >> Modified: llvm/trunk/lib/Transforms/Scalar/GVN.cpp
>> >> URL:
>> >> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scala
>> <http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scala>
>> >> r/GVN.cpp?rev=222039&r1=222038&r2=222039&view=diff
>> >> ===================================================================
>> >> ===========
>> >> --- llvm/trunk/lib/Transforms/Scalar/GVN.cpp (original)
>> >> +++ llvm/trunk/lib/Transforms/Scalar/GVN.cpp Fri Nov 14 15:09:13
>> >> +++ 2014
>> >> @@ -20,6 +20,7 @@
>> >> #include "llvm/ADT/DepthFirstIterator.h"
>> >> #include "llvm/ADT/Hashing.h"
>> >> #include "llvm/ADT/MapVector.h"
>> >> +#include "llvm/ADT/PostOrderIterator.h"
>> >> #include "llvm/ADT/SetVector.h"
>> >> #include "llvm/ADT/SmallPtrSet.h"
>> >> #include "llvm/ADT/Statistic.h"
>> >> @@ -709,6 +710,7 @@ namespace {
>> >> void dump(DenseMap<uint32_t, Value*> &d);
>> >> bool iterateOnFunction(Function &F);
>> >> bool performPRE(Function &F);
>> >> + bool performScalarPRE(Instruction *I);
>> >> Value *findLeader(const BasicBlock *BB, uint32_t num);
>> >> void cleanupGlobalSets();
>> >> void verifyRemoved(const Instruction *I) const; @@ -1729,6
>> >> +1731,15 @@ bool GVN::processNonLocalLoad(LoadInst *
>> >> return false;
>> >> }
>> >>
>> >> + // If this load follows a GEP, see if we can PRE the indices
>> >> + before
>> >> analyzing.
>> >> + if (GetElementPtrInst *GEP =
>> >> dyn_cast<GetElementPtrInst>(LI->getOperand(0))) {
>> >> + for (GetElementPtrInst::op_iterator OI = GEP->idx_begin(),
>> >> + OE = GEP->idx_end();
>> >> + OI != OE; ++OI)
>> >> + if (Instruction *I = dyn_cast<Instruction>(OI->get()))
>> >> + performScalarPRE(I);
>> >> + }
>> >> +
>> >> // Step 2: Analyze the availability of the load AvailValInBlkVect
>> >> ValuesPerBlock; UnavailBlkVect UnavailableBlocks; @@ -2431,175
>> >> +2442,182 @@ bool GVN::processBlock(BasicBlock *BB) { return
>> >> ChangedFunction; }
>> >>
>> >> -/// performPRE - Perform a purely local form of PRE that looks for
>> >> diamond -/// control flow patterns and attempts to perform simple PRE
>> >> at the join point.
>> >> -bool GVN::performPRE(Function &F) {
>> >> - bool Changed = false;
>> >> +bool GVN::performScalarPRE(Instruction *CurInst) {
>> >> SmallVector<std::pair<Value*, BasicBlock*>, 8> predMap;
>> >> - for (BasicBlock *CurrentBlock : depth_first(&F.getEntryBlock())) {
>> >> - // Nothing to PRE in the entry block.
>> >> - if (CurrentBlock == &F.getEntryBlock()) continue;
>> >>
>> >> - // Don't perform PRE on a landing pad.
>> >> - if (CurrentBlock->isLandingPad()) continue;
>> >> + if (isa<AllocaInst>(CurInst) || isa<TerminatorInst>(CurInst) ||
>> >> + isa<PHINode>(CurInst) || CurInst->getType()->isVoidTy() ||
>> >> + CurInst->mayReadFromMemory() ||
>> >> + CurInst->mayHaveSideEffects()
>> >> ||
>> >> + isa<DbgInfoIntrinsic>(CurInst))
>> >> + return false;
>> >>
>> >> - for (BasicBlock::iterator BI = CurrentBlock->begin(),
>> >> - BE = CurrentBlock->end(); BI != BE; ) {
>> >> - Instruction *CurInst = BI++;
>> >> + // Don't do PRE on compares. The PHI would prevent CodeGenPrepare
>> >> from
>> >> + // sinking the compare again, and it would force the code
>> >> + generator
>> >> to
>> >> + // move the i1 from processor flags or predicate registers into a
>> >> general
>> >> + // purpose register.
>> >> + if (isa<CmpInst>(CurInst))
>> >> + return false;
>> >>
>> >> - if (isa<AllocaInst>(CurInst) ||
>> >> - isa<TerminatorInst>(CurInst) || isa<PHINode>(CurInst) ||
>> >> - CurInst->getType()->isVoidTy() ||
>> >> - CurInst->mayReadFromMemory() ||
>> >> CurInst->mayHaveSideEffects()
>> >> ||
>> >> - isa<DbgInfoIntrinsic>(CurInst))
>> >> - continue;
>> >> + // We don't currently value number ANY inline asm calls.
>> >> + if (CallInst *CallI = dyn_cast<CallInst>(CurInst))
>> >> + if (CallI->isInlineAsm())
>> >> + return false;
>> >>
>> >> - // Don't do PRE on compares. The PHI would prevent
>> >> CodeGenPrepare
>> >> from
>> >> - // sinking the compare again, and it would force the code
>> >> generator to
>> >> - // move the i1 from processor flags or predicate registers
>> into
>> >> a
>> >> general
>> >> - // purpose register.
>> >> - if (isa<CmpInst>(CurInst))
>> >> - continue;
>> >> + uint32_t ValNo = VN.lookup(CurInst);
>> >>
>> >> - // We don't currently value number ANY inline asm calls.
>> >> - if (CallInst *CallI = dyn_cast<CallInst>(CurInst))
>> >> - if (CallI->isInlineAsm())
>> >> - continue;
>> >> + // Look for the predecessors for PRE opportunities. We're //
>> >> + only trying to solve the basic diamond case, where // a value is
>> >> + computed in the successor and one predecessor, // but not the
>> >> + other. We also explicitly disallow cases // where the successor
>> >> + is its own predecessor, because they're // more complicated to get
>> >> + right.
>> >> + unsigned NumWith = 0;
>> >> + unsigned NumWithout = 0;
>> >> + BasicBlock *PREPred = nullptr;
>> >> + BasicBlock *CurrentBlock = CurInst->getParent(); predMap.clear();
>> >> +
>> >> + for (pred_iterator PI = pred_begin(CurrentBlock), PE =
>> >> pred_end(CurrentBlock);
>> >> + PI != PE; ++PI) {
>> >> + BasicBlock *P = *PI;
>> >> + // We're not interested in PRE where the block is its
>> >> + // own predecessor, or in blocks with predecessors
>> >> + // that are not reachable.
>> >> + if (P == CurrentBlock) {
>> >> + NumWithout = 2;
>> >> + break;
>> >> + } else if (!DT->isReachableFromEntry(P)) {
>> >> + NumWithout = 2;
>> >> + break;
>> >> + }
>> >>
>> >> - uint32_t ValNo = VN.lookup(CurInst);
>> >> + Value *predV = findLeader(P, ValNo);
>> >> + if (!predV) {
>> >> + predMap.push_back(std::make_pair(static_cast<Value
>> >> + *>(nullptr),
>> >> P));
>> >> + PREPred = P;
>> >> + ++NumWithout;
>> >> + } else if (predV == CurInst) {
>> >> + /* CurInst dominates this predecessor. */
>> >> + NumWithout = 2;
>> >> + break;
>> >> + } else {
>> >> + predMap.push_back(std::make_pair(predV, P));
>> >> + ++NumWith;
>> >> + }
>> >> + }
>> >>
>> >> - // Look for the predecessors for PRE opportunities. We're
>> >> - // only trying to solve the basic diamond case, where
>> >> - // a value is computed in the successor and one predecessor,
>> >> - // but not the other. We also explicitly disallow cases
>> >> - // where the successor is its own predecessor, because they're
>> >> - // more complicated to get right.
>> >> - unsigned NumWith = 0;
>> >> - unsigned NumWithout = 0;
>> >> - BasicBlock *PREPred = nullptr;
>> >> - predMap.clear();
>> >> -
>> >> - for (pred_iterator PI = pred_begin(CurrentBlock),
>> >> - PE = pred_end(CurrentBlock); PI != PE; ++PI) {
>> >> - BasicBlock *P = *PI;
>> >> - // We're not interested in PRE where the block is its
>> >> - // own predecessor, or in blocks with predecessors
>> >> - // that are not reachable.
>> >> - if (P == CurrentBlock) {
>> >> - NumWithout = 2;
>> >> - break;
>> >> - } else if (!DT->isReachableFromEntry(P)) {
>> >> - NumWithout = 2;
>> >> - break;
>> >> - }
>> >> + // Don't do PRE when it might increase code size, i.e. when // we
>> >> + would need to insert instructions in more than one pred.
>> >> + if (NumWithout != 1 || NumWith == 0)
>> >> + return false;
>> >>
>> >> - Value* predV = findLeader(P, ValNo);
>> >> - if (!predV) {
>> >> - predMap.push_back(std::make_pair(static_cast<Value
>> >> *>(nullptr), P));
>> >> - PREPred = P;
>> >> - ++NumWithout;
>> >> - } else if (predV == CurInst) {
>> >> - /* CurInst dominates this predecessor. */
>> >> - NumWithout = 2;
>> >> - break;
>> >> - } else {
>> >> - predMap.push_back(std::make_pair(predV, P));
>> >> - ++NumWith;
>> >> - }
>> >> - }
>> >> + // Don't do PRE across indirect branch.
>> >> + if (isa<IndirectBrInst>(PREPred->getTerminator()))
>> >> + return false;
>> >>
>> >> - // Don't do PRE when it might increase code size, i.e. when
>> >> - // we would need to insert instructions in more than one pred.
>> >> - if (NumWithout != 1 || NumWith == 0)
>> >> - continue;
>> >> + // We can't do PRE safely on a critical edge, so instead we
>> >> schedule
>> >> + // the edge to be split and perform the PRE the next time we
>> >> iterate
>> >> + // on the function.
>> >> + unsigned SuccNum = GetSuccessorNumber(PREPred, CurrentBlock); if
>> >> + (isCriticalEdge(PREPred->getTerminator(), SuccNum)) {
>> >> + toSplit.push_back(std::make_pair(PREPred->getTerminator(),
>> >> SuccNum));
>> >> + return false;
>> >> + }
>> >>
>> >> - // Don't do PRE across indirect branch.
>> >> - if (isa<IndirectBrInst>(PREPred->getTerminator()))
>> >> - continue;
>> >> + // Instantiate the expression in the predecessor that lacked it.
>> >> + // Because we are going top-down through the block, all value
>> >> numbers
>> >> + // will be available in the predecessor by the time we need them.
>> >> Any
>> >> + // that weren't originally present will have been instantiated
>> >> earlier
>> >> + // in this loop.
>> >> + Instruction *PREInstr = CurInst->clone(); bool success = true;
>> >> + for (unsigned i = 0, e = CurInst->getNumOperands(); i != e; ++i) {
>> >> + Value *Op = PREInstr->getOperand(i);
>> >> + if (isa<Argument>(Op) || isa<Constant>(Op) ||
>> >> isa<GlobalValue>(Op))
>> >> + continue;
>> >>
>> >> - // We can't do PRE safely on a critical edge, so instead we
>> >> schedule
>> >> - // the edge to be split and perform the PRE the next time we
>> >> iterate
>> >> - // on the function.
>> >> - unsigned SuccNum = GetSuccessorNumber(PREPred, CurrentBlock);
>> >> - if (isCriticalEdge(PREPred->getTerminator(), SuccNum)) {
>> >> - toSplit.push_back(std::make_pair(PREPred->getTerminator(),
>> >> SuccNum));
>> >> - continue;
>> >> - }
>> >> + if (Value *V = findLeader(PREPred, VN.lookup(Op))) {
>> >> + PREInstr->setOperand(i, V);
>> >> + } else {
>> >> + success = false;
>> >> + break;
>> >> + }
>> >> + }
>> >>
>> >> - // Instantiate the expression in the predecessor that lacked
>> >> it.
>> >> - // Because we are going top-down through the block, all value
>> >> numbers
>> >> - // will be available in the predecessor by the time we need
>> >> them.
>> >> Any
>> >> - // that weren't originally present will have been instantiated
>> >> earlier
>> >> - // in this loop.
>> >> - Instruction *PREInstr = CurInst->clone();
>> >> - bool success = true;
>> >> - for (unsigned i = 0, e = CurInst->getNumOperands(); i != e;
>> >> ++i)
>> >> {
>> >> - Value *Op = PREInstr->getOperand(i);
>> >> - if (isa<Argument>(Op) || isa<Constant>(Op) ||
>> >> isa<GlobalValue>(Op))
>> >> - continue;
>> >> + // Fail out if we encounter an operand that is not available in //
>> >> + the PRE predecessor. This is typically because of loads which //
>> >> + are not value numbered precisely.
>> >> + if (!success) {
>> >> + DEBUG(verifyRemoved(PREInstr));
>> >> + delete PREInstr;
>> >> + return false;
>> >> + }
>> >>
>> >> - if (Value *V = findLeader(PREPred, VN.lookup(Op))) {
>> >> - PREInstr->setOperand(i, V);
>> >> - } else {
>> >> - success = false;
>> >> - break;
>> >> - }
>> >> - }
>> >> + PREInstr->insertBefore(PREPred->getTerminator());
>> >> + PREInstr->setName(CurInst->getName() + ".pre");
>> >> + PREInstr->setDebugLoc(CurInst->getDebugLoc());
>> >> + VN.add(PREInstr, ValNo);
>> >> + ++NumGVNPRE;
>> >> +
>> >> + // Update the availability map to include the new instruction.
>> >> + addToLeaderTable(ValNo, PREInstr, PREPred);
>> >> +
>> >> + // Create a PHI to make the value available in this block.
>> >> + PHINode *Phi =
>> >> + PHINode::Create(CurInst->getType(), predMap.size(),
>> >> + CurInst->getName() + ".pre-phi",
>> >> CurrentBlock->begin());
>> >> + for (unsigned i = 0, e = predMap.size(); i != e; ++i) {
>> >> + if (Value *V = predMap[i].first)
>> >> + Phi->addIncoming(V, predMap[i].second);
>> >> + else
>> >> + Phi->addIncoming(PREInstr, PREPred); }
>> >>
>> >> - // Fail out if we encounter an operand that is not available
>> in
>> >> - // the PRE predecessor. This is typically because of loads
>> >> which
>> >> - // are not value numbered precisely.
>> >> - if (!success) {
>> >> - DEBUG(verifyRemoved(PREInstr));
>> >> - delete PREInstr;
>> >> - continue;
>> >> - }
>> >> + VN.add(Phi, ValNo);
>> >> + addToLeaderTable(ValNo, Phi, CurrentBlock);
>> >> + Phi->setDebugLoc(CurInst->getDebugLoc());
>> >> + CurInst->replaceAllUsesWith(Phi); if
>> >> + (Phi->getType()->getScalarType()->isPointerTy()) {
>> >> + // Because we have added a PHI-use of the pointer value, it has
>> >> now
>> >> + // "escaped" from alias analysis' perspective. We need to
>> inform
>> >> + // AA of this.
>> >> + for (unsigned ii = 0, ee = Phi->getNumIncomingValues(); ii !=
>> >> + ee;
>> >> ++ii) {
>> >> + unsigned jj = PHINode::getOperandNumForIncomingValue(ii);
>> >> + VN.getAliasAnalysis()->addEscapingUse(Phi->getOperandUse(jj));
>> >> + }
>> >>
>> >> - PREInstr->insertBefore(PREPred->getTerminator());
>> >> - PREInstr->setName(CurInst->getName() + ".pre");
>> >> - PREInstr->setDebugLoc(CurInst->getDebugLoc());
>> >> - VN.add(PREInstr, ValNo);
>> >> - ++NumGVNPRE;
>> >> -
>> >> - // Update the availability map to include the new instruction.
>> >> - addToLeaderTable(ValNo, PREInstr, PREPred);
>> >> -
>> >> - // Create a PHI to make the value available in this block.
>> >> - PHINode* Phi = PHINode::Create(CurInst->getType(),
>> >> predMap.size(),
>> >> - CurInst->getName() +
>> ".pre-phi",
>> >> - CurrentBlock->begin());
>> >> - for (unsigned i = 0, e = predMap.size(); i != e; ++i) {
>> >> - if (Value *V = predMap[i].first)
>> >> - Phi->addIncoming(V, predMap[i].second);
>> >> - else
>> >> - Phi->addIncoming(PREInstr, PREPred);
>> >> - }
>> >> -
>> >> - VN.add(Phi, ValNo);
>> >> - addToLeaderTable(ValNo, Phi, CurrentBlock);
>> >> - Phi->setDebugLoc(CurInst->getDebugLoc());
>> >> - CurInst->replaceAllUsesWith(Phi);
>> >> - if (Phi->getType()->getScalarType()->isPointerTy()) {
>> >> - // Because we have added a PHI-use of the pointer value, it
>> >> has
>> >> now
>> >> - // "escaped" from alias analysis' perspective. We need to
>> >> inform
>> >> - // AA of this.
>> >> - for (unsigned ii = 0, ee = Phi->getNumIncomingValues(); ii
>> !=
>> >> ee;
>> >> - ++ii) {
>> >> - unsigned jj = PHINode::getOperandNumForIncomingValue(ii);
>> >> -
>> >> VN.getAliasAnalysis()->addEscapingUse(Phi->getOperandUse(jj));
>> >> - }
>> >> + if (MD)
>> >> + MD->invalidateCachedPointerInfo(Phi);
>> >> + }
>> >> + VN.erase(CurInst);
>> >> + removeFromLeaderTable(ValNo, CurInst, CurrentBlock);
>> >>
>> >> - if (MD)
>> >> - MD->invalidateCachedPointerInfo(Phi);
>> >> - }
>> >> - VN.erase(CurInst);
>> >> - removeFromLeaderTable(ValNo, CurInst, CurrentBlock);
>> >> + DEBUG(dbgs() << "GVN PRE removed: " << *CurInst << '\n');
>> >> + if (MD)
>> >> + MD->removeInstruction(CurInst);
>> >> + DEBUG(verifyRemoved(CurInst));
>> >> + CurInst->eraseFromParent();
>> >> + return true;
>> >> +}
>> >> +
>> >> +/// performPRE - Perform a purely local form of PRE that looks for
>> >> diamond
>> >> +/// control flow patterns and attempts to perform simple PRE at the
>> >> join point.
>> >> +bool GVN::performPRE(Function &F) {
>> >> + bool Changed = false;
>> >> + for (BasicBlock *CurrentBlock : depth_first(&F.getEntryBlock())) {
>> >> + // Nothing to PRE in the entry block.
>> >> + if (CurrentBlock == &F.getEntryBlock())
>> >> + continue;
>> >>
>> >> - DEBUG(dbgs() << "GVN PRE removed: " << *CurInst << '\n');
>> >> - if (MD) MD->removeInstruction(CurInst);
>> >> - DEBUG(verifyRemoved(CurInst));
>> >> - CurInst->eraseFromParent();
>> >> - Changed = true;
>> >> + // Don't perform PRE on a landing pad.
>> >> + if (CurrentBlock->isLandingPad())
>> >> + continue;
>> >> +
>> >> + for (BasicBlock::iterator BI = CurrentBlock->begin(),
>> >> + BE = CurrentBlock->end();
>> >> + BI != BE;) {
>> >> + Instruction *CurInst = BI++;
>> >> + Changed = performScalarPRE(CurInst);
>> >> }
>> >> }
>> >>
>> >> @@ -2637,25 +2655,21 @@ bool GVN::iterateOnFunction(Function &F)
>> >>
>> >> // Top-down walk of the dominator tree bool Changed = false; -#if
>> >> 0
>> >> - // Needed for value numbering with phi construction to work.
>> >> - ReversePostOrderTraversal<Function*> RPOT(&F);
>> >> - for (ReversePostOrderTraversal<Function*>::rpo_iterator RI =
>> >> RPOT.begin(),
>> >> - RE = RPOT.end(); RI != RE; ++RI)
>> >> - Changed |= processBlock(*RI);
>> >> -#else
>> >> // Save the blocks this function have before transformation begins.
>> >> GVN may
>> >> // split critical edge, and hence may invalidate the RPO/DT iterator.
>> >> //
>> >> std::vector<BasicBlock *> BBVect;
>> >> BBVect.reserve(256);
>> >> - for (DomTreeNode *X : depth_first(DT->getRootNode()))
>> >> - BBVect.push_back(X->getBlock());
>> >> + // Needed for value numbering with phi construction to work.
>> >> + ReversePostOrderTraversal<Function *> RPOT(&F); for
>> >> + (ReversePostOrderTraversal<Function *>::rpo_iterator RI =
>> >> RPOT.begin(),
>> >> + RE =
>> >> RPOT.end();
>> >> + RI != RE; ++RI)
>> >> + BBVect.push_back(*RI);
>> >>
>> >> for (std::vector<BasicBlock *>::iterator I = BBVect.begin(), E =
>> >> BBVect.end();
>> >> I != E; I++)
>> >> Changed |= processBlock(*I);
>> >> -#endif
>> >>
>> >> return Changed;
>> >> }
>> >>
>> >> Modified:
>> >> llvm/trunk/test/Analysis/TypeBasedAliasAnalysis/gvn-nonlocal-type-m
>> >> ismatch.ll
>> >> URL:
>> >> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/TypeBa
>> <http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Analysis/TypeBa>
>> >> sedAliasAnalysis/gvn-nonlocal-type-mismatch.ll?rev=222039&r1=222038
>> >> &r2=222039&view=diff
>> >> ===================================================================
>> >> ===========
>> >> ---
>> >> llvm/trunk/test/Analysis/TypeBasedAliasAnalysis/gvn-nonlocal-type-m
>> >> ismatch.ll
>> >> (original)
>> >> +++
>> >> llvm/trunk/test/Analysis/TypeBasedAliasAnalysis/gvn-nonlocal-type-m
>> >> ismatch.ll
>> >> Fri Nov 14 15:09:13 2014
>> >> @@ -46,12 +46,12 @@ entry:
>> >> br i1 %c, label %if.else, label %if.then
>> >>
>> >> if.then:
>> >> - %t = load i32* %p, !tbaa !4
>> >> + %t = load i32* %p, !tbaa !3
>> >> store i32 %t, i32* %q
>> >> ret void
>> >>
>> >> if.else:
>> >> - %u = load i32* %p, !tbaa !3
>> >> + %u = load i32* %p, !tbaa !4
>> >> store i32 %u, i32* %q
>> >> ret void
>> >> }
>> >> @@ -61,11 +61,11 @@ if.else:
>> >>
>> >> ; CHECK: @watch_out_for_another_type_change
>> >> ; CHECK: if.then:
>> >> -; CHECK: %t = load i32* %p
>> >> -; CHECK: store i32 %t, i32* %q
>> >> +; CHECK: store i32 0, i32* %q
>> >> ; CHECK: ret void
>> >> ; CHECK: if.else:
>> >> -; CHECK: store i32 0, i32* %q
>> >> +; CHECK: %u = load i32* %p
>> >> +; CHECK: store i32 %u, i32* %q
>> >>
>> >> define void @watch_out_for_another_type_change(i1 %c, i32* %p, i32*
>> >> %p1,
>> >> i32* %q) nounwind {
>> >> entry:
>> >> @@ -74,12 +74,12 @@ entry:
>> >> br i1 %c, label %if.else, label %if.then
>> >>
>> >> if.then:
>> >> - %t = load i32* %p, !tbaa !3
>> >> + %t = load i32* %p, !tbaa !4
>> >> store i32 %t, i32* %q
>> >> ret void
>> >>
>> >> if.else:
>> >> - %u = load i32* %p, !tbaa !4
>> >> + %u = load i32* %p, !tbaa !3
>> >> store i32 %u, i32* %q
>> >> ret void
>> >> }
>> >>
>> >> Added: llvm/trunk/test/Transforms/GVN/pre-gep-load.ll
>> >> URL:
>> >> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/GVN/
>> <http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/GVN/>
>> >> pre-gep-load.ll?rev=222039&view=auto
>> >> ===================================================================
>> >> ===========
>> >> --- llvm/trunk/test/Transforms/GVN/pre-gep-load.ll (added)
>> >> +++ llvm/trunk/test/Transforms/GVN/pre-gep-load.ll Fri Nov 14
>> >> +++ 15:09:13
>> >> 2014
>> >> @@ -0,0 +1,49 @@
>> >> +; RUN: opt < %s -basicaa -gvn -enable-load-pre -S | FileCheck %s
>> >> +target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
>> >> +target triple = "aarch64--linux-gnu"
>> >> +
>> >> +define double @foo(i32 %stat, i32 %i, double** %p) { ;
>> >> +CHECK-LABEL: @foo(
>> >> +entry:
>> >> + switch i32 %stat, label %sw.default [
>> >> + i32 0, label %sw.bb <http://sw.bb/>
>> >> + i32 1, label %sw.bb <http://sw.bb/>
>> >> + i32 2, label %sw.bb2
>> >> + ]
>> >> +
>> >> +sw.bb <http://sw.bb/>: ;
>> preds = %entry,
>> >> %entry
>> >> + %idxprom = sext i32 %i to i64
>> >> + %arrayidx = getelementptr inbounds double** %p, i64 0
>> >> + %0 = load double** %arrayidx, align 8
>> >> + %arrayidx1 = getelementptr inbounds double* %0, i64 %idxprom
>> >> + %1 = load double* %arrayidx1, align 8 %sub = fsub double %1,
>> >> + 1.000000e+00 %cmp = fcmp olt double %sub, 0.000000e+00 br i1
>> >> + %cmp, label %if.then, label %if.end
>> >> +
>> >> +if.then: ; preds = %sw.bb
>> <http://sw.bb/>
>> >> + br label %return
>> >> +
>> >> +if.end: ; preds = %sw.bb
>> <http://sw.bb/>
>> >> + br label %sw.bb2
>> >> +
>> >> +sw.bb2: ; preds = %if.end,
>> >> %entry
>> >> + %idxprom3 = sext i32 %i to i64
>> >> + %arrayidx4 = getelementptr inbounds double** %p, i64 0
>> >> + %2 = load double** %arrayidx4, align 8
>> >> + %arrayidx5 = getelementptr inbounds double* %2, i64 %idxprom3
>> >> + %3 = load double* %arrayidx5, align 8 ; CHECK: sw.bb2:
>> >> +; CHECK-NEXT-NOT: sext
>> >> +; CHECK-NEXT: phi double [
>> >> +; CHECK-NOT: load
>> >> + %sub6 = fsub double 3.000000e+00, %3
>> >> + br label %return
>> >> +
>> >> +sw.default: ; preds = %entry
>> >> + br label %return
>> >> +
>> >> +return: ; preds =
>> >> %sw.default, %sw.bb2, %if.then
>> >> + %retval.0 = phi double [ 0.000000e+00, %sw.default ], [ %sub6,
>> >> %sw.bb2 ], [ %sub, %if.then ]
>> >> + ret double %retval.0
>> >> +}
>> >>
>> >>
>> >> _______________________________________________
>> >> llvm-commits mailing list
>> >> llvm-commits at cs.uiuc.edu <mailto:llvm-commits at cs.uiuc.edu>
>> >> http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
>> <http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> <0001-Reapply-r221924-GVN-Perform-Scalar-PRE-on-gep-indice.patch>
>> >>
>> >>
>> >>
>> >>
>> >> _______________________________________________
>> >> llvm-commits mailing list
>> >> llvm-commits at cs.uiuc.edu <mailto:llvm-commits at cs.uiuc.edu>
>> >> http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
>> <http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits>
>> >>
>> >
>> >
>> > _______________________________________________
>> > llvm-commits mailing list
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>> > http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
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>> >
>>
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