[llvm-bugs] [Bug 45301] New: 'Can't simplify this node' when building ppc64_defconfig Linux kernel
via llvm-bugs
llvm-bugs at lists.llvm.org
Wed Mar 25 03:34:20 PDT 2020
https://bugs.llvm.org/show_bug.cgi?id=45301
Bug ID: 45301
Summary: 'Can't simplify this node' when building
ppc64_defconfig Linux kernel
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: PowerPC
Assignee: unassignedbugs at nondot.org
Reporter: natechancellor at gmail.com
CC: llvm-bugs at lists.llvm.org, nemanja.i.ibm at gmail.com
When building the powerpc64 Linux kernel (ppc64_defconfig) with a build of LLVM
with assertions enabled:
$ curl -LSs https://git.kernel.org/torvalds/t/linux-5.6-rc7.tar.gz | tar xzf -
$ cd linux-5.6-rc7
$ make -j$(nproc) -s ARCH=powerpc CC=clang CROSS_COMPILE=powerpc64-linux-gnu-
O=out/ppc64 distclean defconfig drivers/net/ethernet/emulex/benet/be_cmds.o
Can't simplify this node
UNREACHABLE executed at
/home/nathan/cbl/git/tc-build-master/llvm-project/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp:809!
Stack dump:
0. Program arguments:
/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10 -cc1
-triple powerpc64-unknown-linux-gnu -S -disable-free -main-file-name be_cmds.c
-mrelocation-model static -mthread-model posix -fno-delete-null-pointer-checks
-mllvm -warn-stack-size=2048 -mframe-pointer=all -relaxed-aliasing -fmath-errno
-masm-verbose -no-integrated-as -mconstructor-aliases -fuse-init-array
-mcode-model large -target-cpu pwr5 -target-feature -altivec -target-feature
-vsx -target-feature -spe -target-feature -hard-float -msoft-float -mfloat-abi
soft -target-abi elfv1 -dwarf-column-info -debugger-tuning=gdb
-coverage-notes-file
/tmp/tmp.ioF70h70K2/linux-5.6-rc7/out/ppc64/drivers/net/ethernet/emulex/benet/be_cmds.gcno
-nostdsysteminc -nobuiltininc -resource-dir
/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/lib/clang/10.0.0
-dependency-file drivers/net/ethernet/emulex/benet/.be_cmds.o.d -MT
drivers/net/ethernet/emulex/benet/be_cmds.o -sys-header-deps -isystem
/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/lib/clang/10.0.0/include
-include /tmp/tmp.ioF70h70K2/linux-5.6-rc7/include/linux/kconfig.h -include
/tmp/tmp.ioF70h70K2/linux-5.6-rc7/include/linux/compiler_types.h -I
/tmp/tmp.ioF70h70K2/linux-5.6-rc7/arch/powerpc/include -I
./arch/powerpc/include/generated -I /tmp/tmp.ioF70h70K2/linux-5.6-rc7/include
-I ./include -I /tmp/tmp.ioF70h70K2/linux-5.6-rc7/arch/powerpc/include/uapi -I
./arch/powerpc/include/generated/uapi -I
/tmp/tmp.ioF70h70K2/linux-5.6-rc7/include/uapi -I ./include/generated/uapi -D
__KERNEL__ -I /tmp/tmp.ioF70h70K2/linux-5.6-rc7/arch/powerpc -D
HAVE_AS_ATHIGH=1 -D _TASK_CPU=300 -I
/tmp/tmp.ioF70h70K2/linux-5.6-rc7/drivers/net/ethernet/emulex/benet -I
./drivers/net/ethernet/emulex/benet -D MODULE -D KBUILD_BASENAME="be_cmds" -D
KBUILD_MODNAME="be2net" -O2 -Wall -Wundef -Werror=strict-prototypes
-Wno-trigraphs -Werror=implicit-function-declaration -Werror=implicit-int
-Wno-format-security -Werror=unknown-warning-option
-Wno-address-of-packed-member -Wno-format-invalid-specifier -Wno-gnu
-Wno-tautological-compare -Wno-unused-const-variable
-Wdeclaration-after-statement -Wvla -Wno-pointer-sign -Werror=date-time
-Werror=incompatible-pointer-types -Wno-initializer-overrides -Wno-format
-Wno-sign-compare -Wno-format-zero-length -std=gnu89 -fno-dwarf-directory-asm
-fdebug-compilation-dir /tmp/tmp.ioF70h70K2/linux-5.6-rc7/out/ppc64
-ferror-limit 19 -fmessage-length 0 -pg -fwrapv -fno-signed-char
-fwchar-type=short -fno-signed-wchar -fobjc-runtime=gcc -fno-common
-fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp
-o /tmp/be_cmds-d1737c.s -x c
/tmp/tmp.ioF70h70K2/linux-5.6-rc7/drivers/net/ethernet/emulex/benet/be_cmds.c
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module
'/tmp/tmp.ioF70h70K2/linux-5.6-rc7/drivers/net/ethernet/emulex/benet/be_cmds.c'.
4. Running pass 'PowerPC DAG->DAG Pattern Instruction Selection' on
function '@be_cmd_rss_config'
#0 0x00000000025383b4 PrintStackTraceSignalHandler(void*)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x25383b4)
#1 0x00000000025362ce llvm::sys::RunSignalHandlers()
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x25362ce)
#2 0x00000000025387c5 SignalHandler(int)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x25387c5)
#3 0x00007f84b246c890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x00007f84b113fe97 raise (/lib/x86_64-linux-gnu/libc.so.6+0x3ee97)
#5 0x00007f84b1141801 abort (/lib/x86_64-linux-gnu/libc.so.6+0x40801)
#6 0x00000000024e2961
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x24e2961)
#7 0x00000000032b5371
llvm::TargetLowering::SimplifyDemandedBits(llvm::SDValue, llvm::APInt const&,
llvm::APInt const&, llvm::KnownBits&, llvm::TargetLowering::TargetLoweringOpt&,
unsigned int, bool) const
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x32b5371)
#8 0x00000000032ab6fd
llvm::TargetLowering::SimplifyDemandedBits(llvm::SDValue, llvm::APInt const&,
llvm::APInt const&, llvm::KnownBits&, llvm::TargetLowering::TargetLoweringOpt&,
unsigned int, bool) const
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x32ab6fd)
#9 0x00000000030e936b (anonymous
namespace)::DAGCombiner::SimplifyDemandedBits(llvm::SDValue, llvm::APInt
const&)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x30e936b)
#10 0x00000000030e537a (anonymous
namespace)::DAGCombiner::visitADDLike(llvm::SDNode*)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x30e537a)
#11 0x0000000003095244 (anonymous namespace)::DAGCombiner::visit(llvm::SDNode*)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x3095244)
#12 0x000000000308ffdc (anonymous
namespace)::DAGCombiner::combine(llvm::SDNode*)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x308ffdc)
#13 0x000000000308db26 llvm::SelectionDAG::Combine(llvm::CombineLevel,
llvm::AAResults*, llvm::CodeGenOpt::Level)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x308db26)
#14 0x00000000031f259a llvm::SelectionDAGISel::CodeGenAndEmitDAG()
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x31f259a)
#15 0x00000000031f0502
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x31f0502)
#16 0x00000000031ece06
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x31ece06)
#17 0x000000000162e1a1 (anonymous
namespace)::PPCDAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x162e1a1)
#18 0x0000000001c1867e
llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x1c1867e)
#19 0x0000000001f9af89 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x1f9af89)
#20 0x0000000001f9b3c8 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x1f9b3c8)
#21 0x0000000001f9baf4 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x1f9baf4)
#22 0x00000000026fc25e clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::HeaderSearchOptions const&, clang::CodeGenOptions const&,
clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout
const&, llvm::Module*, clang::BackendAction,
std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x26fc25e)
#23 0x0000000002e1c1ca
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x2e1c1ca)
#24 0x00000000034ebeb3 clang::ParseAST(clang::Sema&, bool, bool)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x34ebeb3)
#25 0x0000000002d88be0 clang::FrontendAction::Execute()
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x2d88be0)
#26 0x0000000002cf32b2
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x2cf32b2)
#27 0x0000000002e16cf4
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x2e16cf4)
#28 0x000000000159dac9 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*)
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x159dac9)
#29 0x0000000001599c8a main
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x1599c8a)
#30 0x00007f84b1122b97 __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x21b97)
#31 0x0000000001598daa _start
(/home/nathan/cbl/git/tc-build-master/build/llvm/stage1/bin/clang-10+0x1598daa)
clang-10: error: unable to execute command: Aborted
clang-10: error: clang frontend command failed due to signal (use -v to see
invocation)
I bisected this down to 1b7b4b467f03322f37b20ccee5cdef0c9ecec5d4, which adds
the llvm_unreachable that this driver trips over.
creduce spits out:
a(void *b, int c) {
int *d = b;
do {
*d = __builtin_constant_p(0)
? (*d & 255UL) << 24 | (*d & 65280UL) << 8 |
(*d & 16711680UL) >> 8 | (*d & 4278190080) >> 24
: 0;
d++;
c -= 4;
} while (c);
}
struct e {
int f[10]
} g() {
struct e *h = i();
memcpy(h, g, 40);
a(h, sizeof(h->f));
}
Full preprocessed file and interestingness test available at
https://github.com/nathanchance/creduce-files/tree/887a2dff5ee05d953b059cf6ac3ead478fa50ee6/ppc64-be_cmds.
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