https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70666
Bug ID: 70666
Summary: SLP vectorization opportunity to use load element +
splat
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: wschmidt at gcc dot gnu.org
CC: dje at gcc dot gnu.org, rguenth at gcc dot gnu.org
Target Milestone: ---
Target: powerpc*-unknown-linux-gnu
As discussed in PR70130, there is an opportunity to produce better code during
SLP vectorization for a vector load with a permutation vector where all
elements of the permutation are identical. A load of the desired element and a
splat would be better than current generated code, which makes use of unaligned
loads. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70130#c23 for details,
and see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70130#c11 for a test case
that can be used to reproduce the pattern.
