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Author SHA1 Message Date
Andrea Di Biagio 7a85cadfd6 [X86] Add ISel patterns to improve the selection of TZCNT and LZCNT. 
Instructions TZCNT (requires BMI1) and LZCNT (requires LZCNT), always
provide the operand size as output if the input operand is zero.

We can take advantage of this knowledge during instruction selection
stage in order to simplify a few corner case.

llvm-svn: 209159
 2014-05-19 20:38:59 +00:00