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3 Commits

Author SHA1 Message Date
Simon Pilgrim 49d7eda968 [SelectionDAG] Add ComputeNumSignBits support for CONCAT_VECTORS opcode 
llvm-svn: 287541
 2016-11-21 14:36:19 +00:00
Simon Pilgrim b7bbaa669b [X86][SSE] Allow PACKSS to be used to truncate any type of all/none sign bits input 
At the moment we only use truncateVectorCompareWithPACKSS with direct vector comparison results (just one example of a known all/none signbits input).

This change relaxes the direct matching of a SETCC opcode by moving the logic up into SelectionDAG::ComputeNumSignBits and accepting any input with a known splatted signbit.

llvm-svn: 287535
 2016-11-21 12:05:49 +00:00
Simon Pilgrim 0878d46416 [X86][SSE] Add some initial combine tests that could (should?) use PACKSS 
llvm-svn: 287504
 2016-11-20 21:12:49 +00:00