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Benjamin Kramer 3315e168ee BlockFrequency: Saturate at 1 instead of 0 when multiplying a frequency with a branch probability.

Zero is used by BlockFrequencyInfo as a special "don't know" value. It also
causes a sink for frequencies as you can't ever get off a zero frequency with
more multiplies.

This recovers a 10% regression on MultiSource/Benchmarks/7zip. A zero frequency
was propagated into an inner loop causing excessive spilling.

PR16402.

llvm-svn: 184584

2013-06-21 19:30:05 +00:00

BasicAA

Make BasicAliasAnalysis recognize the fact a noalias argument cannot alias another argument, even if the other argument is not itself marked noalias.

2013-05-28 08:17:48 +00:00

BlockFrequencyInfo

BlockFrequency: Saturate at 1 instead of 0 when multiplying a frequency with a branch probability.

2013-06-21 19:30:05 +00:00

BranchProbabilityInfo

Add a new function attribute 'cold' to functions.

2013-05-24 12:26:52 +00:00

CallGraph

Now that invoke of an intrinsic is possible (for the llvm.do.nothing intrinsic)