[Bug tree-optimization/78604] New: [7 regression] test case gcc.target/powerpc/p8vector-vectorize-1.c fails starting with r242750

[seurer at linux dot vnet.ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78604

            Bug ID: 78604
           Summary: [7 regression] test case
                    gcc.target/powerpc/p8vector-vectorize-1.c fails
                    starting with r242750
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: seurer at linux dot vnet.ibm.com
  Target Milestone: ---

spawn /home/seurer/gcc/build/gcc-test/gcc/xgcc
-B/home/seurer/gcc/build/gcc-test/gcc/
/home/seurer/gcc/gcc-test/gcc/testsuite/gcc.target/powerpc/p8vector-vectorize-1.c
-fno-diagnostics-show-caret -fdiagnostics-color=never -mcpu=power8 -O2
-ftree-vectorize -fvect-cost-model=dynamic -fno-unroll-loops
-fno-unroll-all-loops -ffat-lto-objects -S -o p8vector-vectorize-1.s
PASS: gcc.target/powerpc/p8vector-vectorize-1.c (test for excess errors)
PASS: gcc.target/powerpc/p8vector-vectorize-1.c scan-assembler-times [\t
]vaddudm[\t ] 2
PASS: gcc.target/powerpc/p8vector-vectorize-1.c scan-assembler-times [\t
]vsubudm[\t ] 3
PASS: gcc.target/powerpc/p8vector-vectorize-1.c scan-assembler-times [\t
]vmaxsd[\t ] 2
PASS: gcc.target/powerpc/p8vector-vectorize-1.c scan-assembler-times [\t
]vmaxud[\t ] 1
PASS: gcc.target/powerpc/p8vector-vectorize-1.c scan-assembler-times [\t
]vminsd[\t ] 1
PASS: gcc.target/powerpc/p8vector-vectorize-1.c scan-assembler-times [\t
]vminud[\t ] 1
PASS: gcc.target/powerpc/p8vector-vectorize-1.c scan-assembler-times [\t
]vsld[\t ] 2
PASS: gcc.target/powerpc/p8vector-vectorize-1.c scan-assembler-times [\t
]vsrad[\t ] 1
PASS: gcc.target/powerpc/p8vector-vectorize-1.c scan-assembler-times [\t
]vsrd[\t ] 1
FAIL: gcc.target/powerpc/p8vector-vectorize-1.c scan-assembler-times [\t
]vcmpequd[\t ] 2
PASS: gcc.target/powerpc/p8vector-vectorize-1.c scan-assembler-times [\t
]vcmpgtsd[\t ] 1
PASS: gcc.target/powerpc/p8vector-vectorize-1.c scan-assembler-times [\t
]vcmpgtud[\t ] 1


Prior to 242750:

seurer:~/gcc/build/gcc-test$ grep vcmpequd p8vector-vectorize-1.s
        vcmpequd 0,0,1
        vcmpequd 0,0,1

After 242750:

        vcmpequd 0,0,1
        vcmpequd 1,1,13
        vcmpequd 0,0,1
        vcmpequd 1,1,13


It may be the test case just needs to be updated.