Simon Pilgrim 2d4f754c33 [TTI] Reduction costs only need to include a single extract element cost (REAPPLIED) ...

We were adding the entire scalarization extraction cost for reductions, which returns the total cost of extracting every element of a vector type.

For reductions we don't need to do this - we just need to extract the 0'th element after the reduction pattern has completed.

Fixes PR37731

Rebased and reapplied after being reverted in rL347541 due to PR39774 - which was fixed by D54955/rL347759 and D55017/rL347997

Differential Revision: https://reviews.llvm.org/D54585

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@348076 91177308-0d34-0410-b5e6-96231b3b80d8

2018-12-01 14:18:31 +00:00

..

AArch64

[SLPVectorizer] regenerate test checks; NFC

2018-10-20 14:53:07 +00:00

AMDGPU

Fix vectorization of canonicalize

2018-09-17 13:24:30 +00:00

ARM

[SLPVectorizer] add test for PR13837; NFC

2018-01-23 22:04:17 +00:00

NVPTX

[NVPTX] Turn on Loop/SLP vectorization

2018-04-27 13:36:05 +00:00

PowerPC

[SLP] Update tests checks, NFC.

2018-01-05 14:40:04 +00:00

SystemZ

[SLPVectorizer] Add tests related to PR30787, NFCI.

2018-03-29 18:57:03 +00:00

X86

[TTI] Reduction costs only need to include a single extract element cost (REAPPLIED)

2018-12-01 14:18:31 +00:00

XCore

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

int_sideeffect.ll

Add an @llvm.sideeffect intrinsic

2017-11-08 21:59:51 +00:00