[Bug target/82580] Optimize comparisons for __int128 on x86-64

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82580

--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Oct 19 08:37:04 2017
New Revision: 253884

URL: https://gcc.gnu.org/viewcvs?rev=253884&root=gcc&view=rev
Log:
        PR target/82580
        * config/i386/i386.md (setcc + movzbl to xor + setcc): New peephole2.
        (setcc + and to xor + setcc): New peephole2.

        * gcc.target/i386/pr82580.c: Use {\msbb} instead of "sbb" in
        scan-assembler-times.  Check that there are no movzb* instructions
        if lp64.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.md
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.target/i386/pr82580.c