[Bug target/82524] [7/8 Regression] expensive-optimizations produces wrong results

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82524

--- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Oct 13 07:39:42 2017
New Revision: 253711

URL: https://gcc.gnu.org/viewcvs?rev=253711&root=gcc&view=rev
Log:
        PR target/82524
        * config/i386/i386.md (addqi_ext_1, andqi_ext_1,
        *andqi_ext_1_cc, *<code>qi_ext_1, *xorqi_ext_1_cc): Change
        =Q constraints to +Q and into insn condition add check
        that operands[0] and operands[1] are equal.
        (*addqi_ext_2, *andqi_ext_2, *<code>qi_ext_2): Change
        =Q constraints to +Q and into insn condition add check
        that operands[0] is equal to either operands[1] or operands[2].

        * gcc.c-torture/execute/pr82524.c: New test.

Added:
    branches/gcc-7-branch/gcc/testsuite/gcc.c-torture/execute/pr82524.c
Modified:
    branches/gcc-7-branch/gcc/ChangeLog
    branches/gcc-7-branch/gcc/config/i386/i386.md
    branches/gcc-7-branch/gcc/testsuite/ChangeLog