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Author SHA1 Message Date
Eric Christopher cee313d288 Revert "Temporarily Revert "Add basic loop fusion pass."" 
The reversion apparently deleted the test/Transforms directory.

Will be re-reverting again.

llvm-svn: 358552
 2019-04-17 04:52:47 +00:00
Eric Christopher a863435128 Temporarily Revert "Add basic loop fusion pass." 
As it's causing some bot failures (and per request from kbarton).

This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.

llvm-svn: 358546
 2019-04-17 02:12:23 +00:00
Simon Pilgrim d02c55204b [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

llvm-svn: 286233
 2016-11-08 14:10:28 +00:00
Simon Pilgrim 5d5ca9c0cb [X86][SSE] Add initial costs for vector CTTZ/CTLZ 
llvm-svn: 277716
 2016-08-04 10:51:41 +00:00
Simon Pilgrim a2220ea456 [SLPVectorizer][X86] Added CTPOP/CTLZ/CTTZ vectorization tests 
llvm-svn: 268800
 2016-05-06 21:33:01 +00:00