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* [Bug tree-optimization/40771] generated code is ~25% slower when autovectorization is enabled
[not found] <bug-40771-4@http.gcc.gnu.org/bugzilla/>
@ 2020-09-06 10:47 ` zsojka at seznam dot cz
2024-04-03 23:36 ` [Bug target/40771] " pinskia at gcc dot gnu.org
1 sibling, 0 replies; 2+ messages in thread
From: zsojka at seznam dot cz @ 2020-09-06 10:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40771
--- Comment #3 from Zdenek Sojka <zsojka at seznam dot cz> ---
The vectorized code seems to have improved in gcc-9 over gcc-8.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug target/40771] generated code is ~25% slower when autovectorization is enabled
[not found] <bug-40771-4@http.gcc.gnu.org/bugzilla/>
2020-09-06 10:47 ` [Bug tree-optimization/40771] generated code is ~25% slower when autovectorization is enabled zsojka at seznam dot cz
@ 2024-04-03 23:36 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-04-03 23:36 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40771
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
AARCH64 vectorization looks decent too:
```
dup v31.8h, w0
adrp x2, .LC0
adrp x0, .LC1
adrp x1, .LANCHOR0
ldr q30, [x2, #:lo12:.LC0]
ldr q29, [x0, #:lo12:.LC1]
add v30.8h, v31.8h, v30.8h
add v29.8h, v31.8h, v29.8h
uzp2 v29.16b, v30.16b, v29.16b
str q29, [x1, #:lo12:.LANCHOR0]
```
The only improvement that can be made there is with SVE, those ldr could be
`index` instructions instead but that is PR 113328 .
^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] <bug-40771-4@http.gcc.gnu.org/bugzilla/>
2020-09-06 10:47 ` [Bug tree-optimization/40771] generated code is ~25% slower when autovectorization is enabled zsojka at seznam dot cz
2024-04-03 23:36 ` [Bug target/40771] " pinskia at gcc dot gnu.org
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