On Mon, 27 Sep 2021, sunil.k.pandey wrote:
> On Linux/x86_64,
>
> 6390c5047adb75960f86d56582e6322aaa4d9281 is the first bad commit
> commit 6390c5047adb75960f86d56582e6322aaa4d9281
> Author: Richard Biener <[email protected]>
> Date: Wed Nov 18 09:36:57 2020 +0100
>
> Allow different vector types for stmt groups
>
> caused
>
> FAIL: gcc.dg/vect/bb-slp-17.c -flto -ffat-lto-objects scan-tree-dump-times
> slp2 "optimized: basic block" 1
> FAIL: gcc.dg/vect/bb-slp-17.c scan-tree-dump-times slp2 "optimized: basic
> block" 1
This shows that it is maybe a bad idea to support V2SImode vectorization
with -m32 when we refuse to implement even plus.
OTOH it's just the mode that's available, autovectorize_vector_modes
doesn't include the corresponding mode but we still pick it up via
the related vector mode for group-size == 2.
> FAIL: gcc.dg/vect/bb-slp-pr65935.c -flto -ffat-lto-objects
> scan-tree-dump-times slp1 "optimized: basic block" 10
> FAIL: gcc.dg/vect/bb-slp-pr65935.c scan-tree-dump-times slp1 "optimized:
> basic block" 10
We are now vectorizing the SSE tail when vectorizing with AVX. I'll
adjust the testcase to prefer SSE.
> FAIL: gcc.target/i386/vect-pr97352.c scan-assembler-times vmov.pd 4
With -mach=cascadelake we get
vpermpd $68, c, %ymm0
vpermpd $238, c, %ymm0
instead of
vmovapd c, %ymm1
vinsertf128 $1, %xmm1, %ymm1, %ymm0
vperm2f128 $49, %ymm1, %ymm1, %ymm0
what's a way to disallow additional -march= from taking effect? It's
really impossible to cater for all possible ISA variants in these kind
of testcases.
Richard.
