[LLVMbugs] [Bug 20057] New: Assertion failied in llvm::SUnit* llvm::SchedBoundary::pickOnlyChoice(): Assertion `i <= (HazardRec->getMaxLookAhead() + MaxObservedStall) && "permanent hazard"'

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20057

            Bug ID: 20057
           Summary: Assertion failied in llvm::SUnit*
                    llvm::SchedBoundary::pickOnlyChoice(): Assertion `i <=
                    (HazardRec->getMaxLookAhead() + MaxObservedStall) &&
                    "permanent hazard"'
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: llc
          Assignee: unassignedbugs at nondot.org
          Reporter: apazos at codeaurora.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Hi Andrew,

After the new code scheduler changes went in last week in the community trunk
we see new assertions when compiling SPEC2000 mesa and SPEC2006 povray
benchmarks with flags -O2 or -O3 and -mcpu=cortex-a53 for aarch64 target.

Assertion failed in llvm/lib/CodeGen/MachineScheduler.cpp:2056: llvm::SUnit*
llvm::SchedBoundary::pickOnlyChoice(): Assertion `i <=
(HazardRec->getMaxLookAhead() + MaxObservedStall) && "permanent hazard"'
failed.

Here are the clang command lines. Let me know if you can reproduce the issues.

Povray:
clang-3.5 -cc1 -triple aarch64--linux-gnu -emit-obj -disable-free
-main-file-name vbuffer.cpp -mrelocation-model static -mdisable-fp-elim
-menable-no-infs -menable-no-nans -menable-unsafe-fp-math -ffp-contract=fast
-ffast-math -masm-verbose -mconstructor-aliases -fuse-init-array -target-cpu
cortex-a53 -target-feature +neon -target-abi aapcs -target-cpu cortex-a53
-coverage-file
/prj/llvm-arm/scratch2/hexbuild/hexframe/30262/output/config_test_aarch64_ofast/cortex-a53/benchmark/spec2006/povray/benchspec/CPU2006/453.povray/build/build_base_arm_linux.0000/vbuffer.o
-resource-dir
/prj/llvm-arm/home/nightly/install/community-mainline/cross/2014-06-15/bin/../lib/clang/3.5.0
-D SPEC_CPU -D NDEBUG -D __arm__ -D __extern_always_inline=inline -D
SPEC_CPU_LP64 -I /prj/llvm-arm/home/rajav/lib_sources/includes -isysroot
/prj/llvm-arm/home/common/build_tools/gcc-fsf-glibc-aarch64-linux-gnu-4.9.0/aarch64-linux-gnu/libc
-internal-isystem
/prj/llvm-arm/home/common/build_tools/gcc-fsf-glibc-aarch64-linux-gnu-4.9.0/lib/gcc/aarch64-linux-gnu/4.9.0/../../../../aarch64-linux-gnu/include/c++/4.9.0
-internal-isystem
/prj/llvm-arm/home/common/build_tools/gcc-fsf-glibc-aarch64-linux-gnu-4.9.0/lib/gcc/aarch64-linux-gnu/4.9.0/../../../../aarch64-linux-gnu/include/c++/4.9.0/aarch64-linux-gnu
-internal-isystem
/prj/llvm-arm/home/common/build_tools/gcc-fsf-glibc-aarch64-linux-gnu-4.9.0/lib/gcc/aarch64-linux-gnu/4.9.0/../../../../aarch64-linux-gnu/include/c++/4.9.0/backward
-internal-isystem
/prj/llvm-arm/home/common/build_tools/gcc-fsf-glibc-aarch64-linux-gnu-4.9.0/aarch64-linux-gnu/libc/usr/local/include
-internal-isystem
/prj/llvm-arm/home/nightly/install/community-mainline/cross/2014-06-15/bin/../lib/clang/3.5.0/include
-internal-externc-isystem
/prj/llvm-arm/home/common/build_tools/gcc-fsf-glibc-aarch64-linux-gnu-4.9.0/aarch64-linux-gnu/libc/include
-internal-externc-isystem
/prj/llvm-arm/home/common/build_tools/gcc-fsf-glibc-aarch64-linux-gnu-4.9.0/aarch64-linux-gnu/libc/usr/include
-Ofast -fdeprecated-macro -fdebug-compilation-dir
/prj/llvm-arm/scratch2/hexbuild/hexframe/30262/output/config_test_aarch64_ofast/cortex-a53/benchmark/spec2006/povray/benchspec/CPU2006/453.povray/build/build_base_arm_linux.0000
-ferror-limit 19 -fmessage-length 0 -mstackrealign -fno-signed-char
-fobjc-runtime=gcc -fcxx-exceptions -fexceptions -fdiagnostics-show-option
-vectorize-loops -vectorize-slp -o vbuffer.o -x c++ vbuffer.cpp 

Mesa:
clang-3.5 -cc1 -triple aarch64--linux-gnu -emit-obj -disable-free
-main-file-name matrix.c -mrelocation-model static -mdisable-fp-elim
-fmath-errno -masm-verbose -mconstructor-aliases -fuse-init-array -target-cpu
cortex-a53 -target-feature +neon -target-abi aapcs -target-cpu cortex-a53 -g
-coverage-file
/prj/llvm-arm/scratch2/hexbuild/hexframe/30262/output/config_test_aarch64_o2_g/cortex-a53/benchmark/spec2000/mesa/benchspec/CFP2000/177.mesa/run/00000001/matrix.o
-resource-dir
/prj/llvm-arm/home/nightly/install/community-mainline/cross/2014-06-15/bin/../lib/clang/3.5.0
-D __arm__ -D __extern_always_inline=inline -I
/prj/llvm-arm/home/rajav/lib_sources/includes -isysroot
/prj/llvm-arm/home/common/build_tools/gcc-fsf-glibc-aarch64-linux-gnu-4.9.0/aarch64-linux-gnu/libc
-internal-isystem
/prj/llvm-arm/home/common/build_tools/gcc-fsf-glibc-aarch64-linux-gnu-4.9.0/aarch64-linux-gnu/libc/usr/local/include
-internal-isystem
/prj/llvm-arm/home/nightly/install/community-mainline/cross/2014-06-15/bin/../lib/clang/3.5.0/include
-internal-externc-isystem
/prj/llvm-arm/home/common/build_tools/gcc-fsf-glibc-aarch64-linux-gnu-4.9.0/aarch64-linux-gnu/libc/include
-internal-externc-isystem
/prj/llvm-arm/home/common/build_tools/gcc-fsf-glibc-aarch64-linux-gnu-4.9.0/aarch64-linux-gnu/libc/usr/include
-O2 -fdebug-compilation-dir
/prj/llvm-arm/scratch2/hexbuild/hexframe/30262/output/config_test_aarch64_o2_g/cortex-a53/benchmark/spec2000/mesa/benchspec/CFP2000/177.mesa/run/00000001
-ferror-limit 19 -fmessage-length 0 -mstackrealign -fno-signed-char
-fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -o
matrix.o -x c matrix.c

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