[Bug tree-optimization/59501] [4.9 Regression] Vector Gather with GCC 4.9 2013-12-08 Snapshot

[hjl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59501

--- Comment #7 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Tue Sep  5 16:39:24 2017
New Revision: 251718

URL: https://gcc.gnu.org/viewcvs?rev=251718&root=gcc&view=rev
Log:
i386: Avoid stack realignment if possible

ix86_finalize_stack_frame_flags has been extended to eliminate frame
pointer when the new stack frame isn't needed with and without
-maccumulate-outgoing-args as well as -fomit-frame-pointer.  Since stack
access with larger alignment may be optimized out, to decide if stack
realignment is needed, we need to not only check for stack frame access,
but also verify the alignment of stack frame access.  Since alignment of
memory access via arg_pointer is set up by caller, not by callee, we
should find the maximum stack alignment from the stack frame access
instructions via stack pointer and frame pointrer to avoid stack
realignment when stack alignment needed is less than incoming stack
boundary.

gcc/

        PR target/59501
        PR target/81624
        PR target/81769
        * config/i386/i386.c (ix86_finalize_stack_frame_flags): Don't
        realign stack if stack alignment needed is less than incoming
        stack boundary.

gcc/testsuite/

        PR target/59501
        PR target/81624
        PR target/81769
        * gcc.target/i386/pr59501-4a.c: Remove xfail.
        * gcc.target/i386/pr81769-1a.c: New test.
        * gcc.target/i386/pr81769-1b.c: Likewise.
        * gcc.target/i386/pr81769-2.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr81769-1a.c
    trunk/gcc/testsuite/gcc.target/i386/pr81769-1b.c
    trunk/gcc/testsuite/gcc.target/i386/pr81769-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.target/i386/pr59501-4a.c