Simon Pilgrim 169b408a54 [VectorLegalizer] Expansion of CTLZ using CTPOP when possible ...

This patch avoids scalarization of CTLZ by instead expanding to use CTPOP (ref: "Hacker's Delight") when the necessary operations are available.

This also adds the necessary cost models for X86 SSE2 targets (the main beneficiary) to ensure vectorization only happens when its useful.

Differential Revision: https://reviews.llvm.org/D25910

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286233 91177308-0d34-0410-b5e6-96231b3b80d8

2016-11-08 14:10:28 +00:00

..

AArch64

[SLP] Avoid signed integer overflow

2016-08-23 20:48:50 +00:00

AMDGPU

[SLPVectorizer] Try different vectorization factors for store chains

2015-07-08 23:40:55 +00:00

ARM

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

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

PowerPC

[SLP] Pass in correct alignment when query memory access cost

2016-05-31 20:41:19 +00:00

X86

[VectorLegalizer] Expansion of CTLZ using CTPOP when possible

2016-11-08 14:10:28 +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