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Author SHA1 Message Date
Juergen Ributzka 89d187b387 Reapply [FastISel][X86] Use XOR to materialize the "0" value (r215594). 
Note: This was originally reverted to track down a buildbot error. Reapply
without any modifications.

llvm-svn: 216011
 2014-08-19 19:44:10 +00:00
Juergen Ributzka 790bacf232 Revert several FastISel commits to track down a buildbot error. 
This reverts:
r215595 "[FastISel][X86] Add large code model support for materializing floating-point constants."
r215594 "[FastISel][X86] Use XOR to materialize the "0" value."
r215593 "[FastISel][X86] Emit more efficient instructions for integer constant materialization."
r215591 "[FastISel][AArch64] Make use of the zero register when possible."
r215588 "[FastISel] Let the target decide first if it wants to materialize a constant."
r215582 "[FastISel][AArch64] Cleanup constant materialization code. NFCI."

llvm-svn: 215673
 2014-08-14 19:56:28 +00:00
Juergen Ributzka ba8b79e932 [FastISel][X86] Use XOR to materialize the "0" value. 
llvm-svn: 215594
 2014-08-13 22:22:17 +00:00
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