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

[uros at gcc dot gnu.org]

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

--- Comment #12 from uros at gcc dot gnu.org ---
Author: uros
Date: Wed Oct 18 20:19:05 2017
New Revision: 253867

URL: https://gcc.gnu.org/viewcvs?rev=253867&root=gcc&view=rev
Log:
        PR target/82580
        * config/i386/i386-modes.def (CCGZ): New CC mode.
        * config/i386/i386.md (sub<mode>3_carry_ccgz): New insn pattern.
        * config/i386/predicates.md (ix86_comparison_operator):
        Handle CCGZmode.
        * config/i386/i386.c (ix86_expand_branch) <case E_TImode>:
        Emulate LE, LEU, GT, GTU, LT, LTU, GE and GEU double-word comparisons
        with double-word subtraction.
        (put_condition_code): Handle CCGZmode.

testsuite/ChangeLog:

        PR target/82580
        * gcc.target/i386/pr82580.c: New test.


Added:
    trunk/gcc/testsuite/gcc.target/i386/pr82580.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386-modes.def
    trunk/gcc/config/i386/i386.c
    trunk/gcc/config/i386/i386.md
    trunk/gcc/config/i386/predicates.md
    trunk/gcc/testsuite/ChangeLog