[LLVMbugs] [Bug 12941] New: -O2 causes: Assertion `S < E && "Cannot create empty or backwards range"' failed.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12941

             Bug #: 12941
           Summary: -O2 causes: Assertion `S < E && "Cannot create empty
                    or backwards range"' failed.
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: stefan.thiede at gmx.net
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 8634
  --> http://llvm.org/bugs/attachment.cgi?id=8634
minimal testcase

rhe5
clang 3.0 built using gcc 4.6.2
clang 3.1 built using 4.1.2 20080704 (Red Hat 4.1.2-48)

clang-3.0/bin/clang -O2 -o clang31core.o -c clang31core.c

creates object file, clang 3.1 doesn't when -O2 is present, works without -O2

clang-3.1/bin/clang -O2 -o clang31core.o -c clang31core.c

clang: llvm-3.1.src/include/llvm/CodeGen/LiveInterval.h:130:
llvm::LiveRange::LiveRange(llvm::SlotIndex, llvm::SlotIndex, llvm::VNInfo*):
Assertion `S < E && "Cannot create empty or backwards range"' failed.
0  clang           0x000000000234338f
1  clang           0x00000000023440a7
2  libpthread.so.0 0x000000350ac0eb10
3  libc.so.6       0x000000350a030265 gsignal + 53
4  libc.so.6       0x000000350a031d10 abort + 272
5  libc.so.6       0x000000350a0296e6 __assert_fail + 246
6  clang           0x0000000001dde283
7  clang           0x0000000001ddecc4
8  clang           0x0000000001ddf3b2
9  clang           0x0000000001de2c5d
10 clang           0x0000000001d444ce
11 clang           0x0000000001e47084 llvm::RegAllocBase::allocatePhysRegs() +
324
12 clang           0x0000000001d3fa4f
13 clang           0x0000000001cf0945
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 53
14 clang           0x00000000022d2604
llvm::FPPassManager::runOnFunction(llvm::Function&) + 596
15 clang           0x00000000022d269d
llvm::FPPassManager::runOnModule(llvm::Module&) + 45
16 clang           0x00000000022d215c
llvm::MPPassManager::runOnModule(llvm::Module&) + 556
17 clang           0x00000000022d22af llvm::PassManagerImpl::run(llvm::Module&)
+ 159
18 clang           0x00000000022d239d llvm::PassManager::run(llvm::Module&) +
13
19 clang           0x00000000008250ec
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::Module*,
clang::BackendAction, llvm::raw_ostream*) + 1388
20 clang           0x0000000000822643
21 clang           0x00000000009dd509 clang::ParseAST(clang::Sema&, bool, bool)
+ 489
22 clang           0x0000000000820812 clang::CodeGenAction::ExecuteAction() +
66
23 clang           0x000000000067162b
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 331
24 clang           0x000000000065150e
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1166
25 clang           0x0000000000647e0f cc1_main(char const**, char const**, char
const*, void*) + 1519
26 clang           0x00000000006502e6 main + 4054
27 libc.so.6       0x000000350a01d994 __libc_start_main + 244
28 clang           0x0000000000646229
Stack dump:
0.      Program arguments: clang-3.1/bin/clang -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -disable-free -main-file-name clang31core.c
-mrelocation-model static -masm-verbose -mconstructor-aliases -munwind-tables
-target-cpu x86-64 -target-linker-version 2.17.50.0.6 -momit-leaf-frame-pointer
-coverage-file clang31core.o -resource-dir clang-3.1/bin/../lib/clang/3.1
-fmodule-cache-path /var/tmp/clang-module-cache -internal-isystem
/usr/local/include -internal-isystem clang-3.1/bin/../lib/clang/3.1/include
-internal-externc-isystem /include -internal-externc-isystem /usr/include -O2
-fdebug-compilation-dir /home/usb06529/snoopy -ferror-limit 19 -fmessage-length
137 -mstackrealign -fgnu-runtime -fobjc-runtime-has-arc -fobjc-runtime-has-weak
-fobjc-fragile-abi -fdiagnostics-show-option -fcolor-diagnostics -o
clang31core.o -x c clang31core.c

-- 
Configure bugmail: http://llvm.org/bugs/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.