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[Bug target/61915] [AArch64] High amounts of GP to FP register moves using LRA on AArch64
- From: "wdijkstr at arm dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sat, 25 Oct 2014 00:57:32 +0000
- Subject: [Bug target/61915] [AArch64] High amounts of GP to FP register moves using LRA on AArch64
- Auto-submitted: auto-generated
- References: <bug-61915-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61915
--- Comment #15 from Wilco <wdijkstr at arm dot com> ---
(In reply to Evandro from comment #12)
> (In reply to Evandro from comment #11)
> > Do you have an idea of the performance impact of this patch?
>
> At least in Dhrystone, it improved by over 2% on A57.
It was ~2% on SPECINT2k, ~3% on SPECFP2k. There were large gains on other
benchmarks where the allocator had gone berserk on FP moves inside the hot
loop. The removal of the redundant FP saves/restores in many functions helps as
well.