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Messages in this thread Complete thread (EXPERIMENTAL) |
likely/unlikely set the branch prediction values to 99% or 1%
respectively. If this causes the code generated to perform less
optimally than without, I'm sure the gcc guys would be -very- interested
to hear that...
On some ppc64 the branch prediction is quite good and static prediction will override the dynamic prediction. I think we avoid predicting a branch unless we are quite sure (95%/5%). So if likely/unlikely is overused (on more marginal conditionals) then it could be a performance loss. Anton | ||||||||||
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