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4 Commits

Author SHA1 Message Date
Sanjay Patel
155193c3aa [x86, AVX] fold 'isPositive' 256-bit vector integer operations (PR26701) 
This extends the fold introduced with:
http://reviews.llvm.org/rL262036

llvm-svn: 262047
 2016-02-26 18:42:50 +00:00
Sanjay Patel
334685b486 [x86, AVX] add 256-bit tests 
llvm-svn: 262044
 2016-02-26 18:07:58 +00:00
Sanjay Patel
4402a32b32 [x86, SSE] fold 'isPositive' vector integer operations (PR26701) 
This is one of the cases shown in:
https://llvm.org/bugs/show_bug.cgi?id=26701

Shift and negate is what InstCombine appears to prefer, so I've started with that pattern. 
Note that the 'pcmpeq' instructions are always generating the negative one for the actual
'pcmpgt' comparison in each case (side note: why isn't there an alias mnemonic for that?).

Differential Revision: http://reviews.llvm.org/D17630

llvm-svn: 262036
 2016-02-26 16:56:03 +00:00
Sanjay Patel
7ed9361896 [x86, SSE] add tests to show missing pcmp folds 
llvm-svn: 261948
 2016-02-26 01:14:27 +00:00