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Author SHA1 Message Date
NAKAMURA Takumi 0ecb6e77f3 llvm/test/CodeGen/X86/2014-05-29-factorial.ll: Relax an expression to match Win32 x64. 
llvm-svn: 210471
 2014-06-09 14:20:23 +00:00
Andrea Di Biagio dfbdc71ea1 [X86] Avoid emitting unnecessary test instructions. 
This patch teaches the backend how to check for the 'NoSignedWrap' flag on
binary operations to improve the emission of 'test' instructions.

If the result of a binary operation is known not to overflow we know that
resetting the Overflow flag is unnecessary and so we can avoid emitting
the test instruction.

Patch by Marcello Maggioni.

llvm-svn: 210468
 2014-06-09 12:34:50 +00:00