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3 Commits

Author SHA1 Message Date
Juergen Ributzka aa60209311 [FastISel][X86] Optimize predicates and fold CMP instructions. 
This optimizes predicates for certain compares, such as fcmp oeq %x, %x to
fcmp ord %x, %x. The latter one is more efficient to generate.

The same optimization is applied to conditional branches.

llvm-svn: 211126
 2014-06-17 21:55:43 +00:00
Juergen Ributzka e35705675f [FastISel][X86] Fix previous refactoring commit (r211077) 
Overlooked that fcmp_une uses an "or" instead of an "and" for combining the
flags.

llvm-svn: 211104
 2014-06-17 14:47:45 +00:00
Juergen Ributzka 2da1bbc113 [FastISel][X86] Refactor the code to get the X86 condition from a helper function. NFC. 
Make use of helper functions to simplify the branch and compare instruction
selection in FastISel. Also add test cases for compare and conditonal branch.

llvm-svn: 211077
 2014-06-16 23:58:24 +00:00