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[Bug target/81312] Enable X86_TUNE_ACCUMULATE_OUTGOING_ARGS
- From: "hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 04 Jul 2017 17:13:41 +0000
- Subject: [Bug target/81312] Enable X86_TUNE_ACCUMULATE_OUTGOING_ARGS
- Auto-submitted: auto-generated
- References: <bug-81312-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81312
--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Jan Hubicka from comment #3)
> > Doesn't it improve performance in 64-bit mode?
>
> It used to be important for CPUs without ESP prediction engines, but most of
> those are
> history now. The codegen is quite different so it may be the case that it
> still helps
> somehow. Do you have some data on the perfomrance?
>
It is related to PR 81313. Without it, GCC generates awful stack realignment
code.