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Commit 4e55044f authored by Jakob Stoklund Olesen's avatar Jakob Stoklund Olesen
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Don't PRE compares.

CodeGenPrepare sinks compare instructions down to their uses to prevent
live flags and predicate registers across basic blocks.

PRE of a compare instruction prevents that, forcing the i1 compare
result into a general purpose register.  That is usually more expensive
than the redundant compare PRE was trying to eliminate in the first
place.

llvm-svn: 153657
parent 3e2320c8
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