[Bug target/81736] Unnecessary save and restore frame pointer with -fno-omit-frame-pointer
aldyh at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Wed Sep 13 16:50:00 GMT 2017
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81736
--- Comment #11 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Author: aldyh
Date: Wed Sep 13 16:49:48 2017
New Revision: 252388
URL: https://gcc.gnu.org/viewcvs?rev=252388&root=gcc&view=rev
Log:
i386: Don't use frame pointer without stack access
When there is no stack access, there is no need to use frame pointer
even if -fno-omit-frame-pointer is used and caller's frame pointer is
unchanged.
gcc/
PR target/81736
* config/i386/i386.c (ix86_finalize_stack_realign_flags): Renamed
to ...
(ix86_finalize_stack_frame_flags): This. Also clear
frame_pointer_needed if -fno-omit-frame-pointer is used without
stack access.
(ix86_expand_prologue): Replace ix86_finalize_stack_realign_flags
with ix86_finalize_stack_frame_flags.
(ix86_expand_epilogue): Likewise.
(ix86_expand_split_stack_prologue): Likewise.
* doc/invoke.texi: Add a note for -fno-omit-frame-pointer.
gcc/testsuite/
PR target/81736
* gcc.target/i386/pr81736-1.c: New test.
* gcc.target/i386/pr81736-2.c: Likewise.
* gcc.target/i386/pr81736-3.c: Likewise.
* gcc.target/i386/pr81736-4.c: Likewise.
* gcc.target/i386/pr81736-5.c: Likewise.
* gcc.target/i386/pr81736-6.c: Likewise.
* gcc.target/i386/pr81736-7.c: Likewise.
Added:
branches/range-gen2/gcc/testsuite/gcc.target/i386/pr81736-1.c
branches/range-gen2/gcc/testsuite/gcc.target/i386/pr81736-2.c
branches/range-gen2/gcc/testsuite/gcc.target/i386/pr81736-3.c
branches/range-gen2/gcc/testsuite/gcc.target/i386/pr81736-4.c
branches/range-gen2/gcc/testsuite/gcc.target/i386/pr81736-5.c
branches/range-gen2/gcc/testsuite/gcc.target/i386/pr81736-6.c
branches/range-gen2/gcc/testsuite/gcc.target/i386/pr81736-7.c
Modified:
branches/range-gen2/gcc/ChangeLog
branches/range-gen2/gcc/config/i386/i386.c
branches/range-gen2/gcc/doc/invoke.texi
branches/range-gen2/gcc/testsuite/ChangeLog
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