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| author | Tamar Christina <tamar.christina@arm.com> | 2020-11-05 11:46:35 +0000 |
|---|---|---|
| committer | Tamar Christina <tamar.christina@arm.com> | 2020-11-05 11:46:35 +0000 |
| commit | 199988774d74091e467aef695d0d985528360613 (patch) | |
| tree | 1eb96fe6c46d75a4e779ac17499b4bcc496432fc /libstdc++-v3/src | |
| parent | 7eb6c0ad2611e0802c3684196c9a7e94162f2c51 (diff) | |
| download | gcc-199988774d74091e467aef695d0d985528360613.zip gcc-199988774d74091e467aef695d0d985528360613.tar.gz gcc-199988774d74091e467aef695d0d985528360613.tar.bz2 | |
middle-end: optimize slp simplify back to back permutes.
This optimizes sequential permutes. i.e. if there are two permutes back to back
this function applies the permute of the parent to the child and removed the
parent.
This relies on the materialization point calculation in optimize SLP.
This allows us to remove useless permutes such as
ldr q0, [x0, x3]
ldr q2, [x1, x3]
trn1 v1.4s, v0.4s, v0.4s
trn2 v0.4s, v0.4s, v0.4s
trn1 v0.4s, v1.4s, v0.4s
mov v1.16b, v3.16b
fcmla v1.4s, v0.4s, v2.4s, #0
fcmla v1.4s, v0.4s, v2.4s, #90
str q1, [x2, x3]
from the sequence the vectorizer puts out and give
ldr q0, [x0, x3]
ldr q2, [x1, x3]
mov v1.16b, v3.16b
fcmla v1.4s, v0.4s, v2.4s, #0
fcmla v1.4s, v0.4s, v2.4s, #90
str q1, [x2, x3]
instead.
gcc/ChangeLog:
* tree-vect-slp.c (vect_slp_tree_permute_noop_p): New.
(vect_optimize_slp): Optimize permutes.
(vectorizable_slp_permutation): Fix typo.
Diffstat (limited to 'libstdc++-v3/src')
0 files changed, 0 insertions, 0 deletions