https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114328
Bug ID: 114328
Summary: Using -march=armv9-a+nosve does not allow for
vectorization
Product: gcc
Version: 13.1.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: pinskia at gcc dot gnu.org
CC: mjr19 at cam dot ac.uk
Blocks: 53947
Target Milestone: ---
Target: aarch64
Created attachment 57689
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57689&action=edit
Testcase
I noticed this while looking into PR 114324, the cost model for
-march=armv9-a+nosve causes this code not to be vectorized using ld2/st2 using
the SIMD (non-SVE) registers.
I don't understand why though because -march=armv8.4-a still does though.
Note this is all at -Ofast.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations
