search for: ishotblock

Hi, The problem we're trying to address: PGO transforms that are based on block counts need some way to answer isHotBlock() query. A simple comparison of the form block_count > N, for some constant N is not useful since even for the same program different profile inputs can cause different answers for isHotBlock() on the same block. This can be addressed by comparing against a reference value that depends on the pr...

...vm-dev at lists.llvm.org > Cc: David Li <davidxl at google.com> > Subject: [llvm-dev] RFC: Hotness thresholds in profile header > > > > Hi, > > The problem we're trying to address: > > PGO transforms that are based on block counts need some way to answer > isHotBlock() query. A simple comparison of the form block_count > N, for > some constant N is not useful since even for the same program different > profile inputs can cause different answers for isHotBlock() on the same > block. This can be addressed by comparing against a reference value that &g...

...Li <davidxl at google.com> >> Subject: [llvm-dev] RFC: Hotness thresholds in profile header >> >> >> >> Hi, >> >> The problem we're trying to address: >> >> PGO transforms that are based on block counts need some way to answer >> isHotBlock() query. A simple comparison of the form block_count > N, >> for some constant N is not useful since even for the same program >> different profile inputs can cause different answers for isHotBlock() >> on the same block. This can be addressed by comparing against a >> re...