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4 Commits

Author SHA1 Message Date
Simon Pilgrim 05ab8ffc7e [DAGCombiner] Try to use SelectionDAG::isKnownToBeAPowerOfTwo instead of just APInt::isPowerOf2 
Generalize sdiv/udiv/srem/urem combines using APInt::isPowerOf2, which only works for const/splat-const values, to call SelectionDAG::isKnownToBeAPowerOfTwo instead which recognises many more cases.

Added a DAGCombiner::BuildLogBase2 helper since PowerOf2 combines often involve taking the log2 of such a value.

Differential Revision: https://reviews.llvm.org/D27714

llvm-svn: 289654
 2016-12-14 15:08:13 +00:00
Simon Pilgrim ebe58191c8 [X86][SSE] Add AVX1 tests to sdiv/udiv srem/urem combine tests 
As requested on D27714

llvm-svn: 289652
 2016-12-14 14:39:51 +00:00
Simon Pilgrim 4ebb04510a [DAGCombiner] Enable sdiv(x.y) -> udiv(x,y) combine for vectors 
SelectionDAG::SignBitIsZero (via SelectionDAG::computeKnownBits) has supported vectors since rL280927

llvm-svn: 285118
 2016-10-25 20:56:42 +00:00
Simon Pilgrim 61cdeb46c9 [X86][SSE] Added vector sdiv combine tests 
llvm-svn: 285112
 2016-10-25 20:25:47 +00:00