tree 2a46cabfdfbfa43a9abb85901f59aeedc592a498
parent 2d323d4ed212c93fba316c1d633ed627a6343398
author Charlie Turner <charlie.turner@arm.com> 1445968151 +0000
committer Charlie Turner <charlie.turner@arm.com> 1445968151 +0000

[SLP] Treat SelectInsts as reduction values.

Summary:
Certain workloads, in particular sum-of-absdiff loops, can be vectorized using SLP if it can treat select instructions as reduction values.

The test case is a bit awkward. The AArch64 cost model needs some tuning to not be so pessimistic about selects. I've had to tweak the SLP threshold here.

Reviewers: jmolloy, mzolotukhin, spatel, nadav

Subscribers: nadav, mssimpso, aemerson, llvm-commits

Differential Revision: http://reviews.llvm.org/D13949

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@251424 91177308-0d34-0410-b5e6-96231b3b80d8