[llvm-bugs] [Bug 37887] New: Scimark miscompile with instcombine+gvn

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Jun 20 22:33:39 PDT 2018


            Bug ID: 37887
           Summary: Scimark miscompile with instcombine+gvn
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: cs12b1010 at iith.ac.in
                CC: llvm-bugs at lists.llvm.org

Change directory to test-suite/MultiSource/Benchmarks/SciMark2-C

clang -m64 -O3 -flto -fuse-ld=lld -c *.c

clang -m64 -O3 -flto -fuse-ld=lld *.o -Wl,-save-temps -lm

opt -inline-threshold=1000000 -inline -instcombine -gvn
a.out.0.2.internalize.bc -o b.bc 

llc -O3 -filetype=asm b.bc

clang b.s -lm


Segmentation fault.

Program received signal SIGSEGV, Segmentation fault.
0x0000000000220468 in SOR_execute (omega=1.25, M=<optimized out>, N=<optimized
out>, G=<optimized out>, num_iterations=<optimized out>)
    at /home/pbhatu/test-suite/MultiSource/Benchmarks/SciMark2-C/SOR.c:37
37                          Gi[j] = omega_over_four * (Gim1[j] + Gip1[j] +

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