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4 Commits

Author SHA1 Message Date
Sanjay Patel e372aecb8a [ValueTracking] fix matchSelectPattern to allow vector splat folds of min/max/abs/nabs 
llvm-svn: 285303
 2016-10-27 15:26:10 +00:00
Sanjay Patel d5b8d64d4b [InstCombine] add tests for missing folds of vector abs/nabs/min/max 
llvm-svn: 285299
 2016-10-27 15:02:45 +00:00
Dinesh Dwivedi 95f0d51bd3 This removes TODO added in http://reviews.llvm.org/D3658 
The patch transforms

ABS(NABS(X)) -> ABS(X)
NABS(ABS(X)) -> NABS(X)

Differential Revision: http://reviews.llvm.org/D4040

llvm-svn: 210782
 2014-06-12 14:06:00 +00:00
Dinesh Dwivedi 3217b6c661 Added select flavour for ABS and NEG(ABS) 
This patch can identify 
  ABS(X) ==> (X >s 0) ? X : -X and (X >s -1) ? X : -X
  ABS(X) ==> (X <s 0) ? -X : X and (X <s 1) ? -X : X
  NABS(X) ==> (X >s 0) ? -X : X and (X >s -1) ? -X : X
  NABS(X) ==> (X <s 0) ? X : -X and (X <s 1) ? X : -X
  
and can transform
  ABS(ABS(X)) -> ABS(X)
  NABS(NABS(X)) -> NABS(X)
  
Differential Revision: http://reviews.llvm.org/D3658

llvm-svn: 210312
 2014-06-06 06:54:45 +00:00