https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118188
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2024-12-29
Summary|[15 regression] aarch64: |aarch64: worse code with
|30% regression in TSVC |-mtune=grace (vs
|s4115 since |-mtune=generic) in TSVC
|r15-5565-gdbc38dd9e96a99 |s4115
Status|UNCONFIRMED |NEW
Target Milestone|15.0 |---
Ever confirmed|0 |1
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> This was a costing model change so this is a target issue.
Definitely since the generic armv9 cost model produces the expected behavior.
that is `-Ofast -march=armv9-a -mcpu=generic` still produces the full SVE code
while `-Ofast -mcpu=grace` does not.
Also it is not a regression in that GCC 14.2.0 produced the non-SVE code with
-mcpu=neoverse-v2 (grace), so did 13.2.0 and 12.2.0 while the generic tuning
didn't.
