[Bug rtl-optimization/82628] [8 Regression] wrong code at -Os on x86_64-linux-gnu in the 32-bit mode

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82628

--- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Oct 23 14:58:23 2017
New Revision: 254011

URL: https://gcc.gnu.org/viewcvs?rev=254011&root=gcc&view=rev
Log:
        PR target/82628
        * config/i386/predicates.md (x86_64_dwzext_immediate_operand): New.
        * config/i386/constraints.md (Wf): New constraint.
        * config/i386/i386.md (UNSPEC_SBB): New unspec.
        (cmp<dwi>_doubleword): Removed.
        (sub<mode>3_carry_ccc, *sub<mode>3_carry_ccc_1): New patterns.
        (sub<mode>3_carry_ccgz): Use unspec instead of compare.
        * config/i386/i386.c (ix86_expand_branch) <case E_TImode>: Don't
        expand with cmp<dwi>_doubleword.  For LTU and GEU use
        sub<mode>3_carry_ccc instead of sub<mode>3_carry_ccgz and use CCCmode.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/constraints.md
    trunk/gcc/config/i386/i386.c
    trunk/gcc/config/i386/i386.md
    trunk/gcc/config/i386/predicates.md