Owen Anderson 2cfe91379b Extend SimplifyCFG's common-destination folding heuristic to allow a single ...

"bonus" instruction to be speculatively executed.  Add a heuristic to
ensure we're not tripping up out-of-order execution by checking that this bonus
instruction only uses values that were already guaranteed to be available.

This allows us to eliminate the short circuit in (x&1)&&(x&2).

llvm-svn: 108351

2010-07-14 19:52:16 +00:00

86 KiB

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