search for: optimizebranches

...en a pass at the MachineFunction level which combines >> machine basic blocks which is guaranteed to be the single predecessor >> to another block? Or is there a reason not to combine them? > > I'm not sure exactly what transformation you're referring to, but BranchFolder::OptimizeBranches does a lot of things like that.

Has anyone written a pass at the MachineFunction level which combines machine basic blocks which is guaranteed to be the single predecessor to another block? Or is there a reason not to combine them? - Thanks Jeff Kunkel

...Has anyone written a pass at the MachineFunction level which combines > machine basic blocks which is guaranteed to be the single predecessor > to another block? Or is there a reason not to combine them? I'm not sure exactly what transformation you're referring to, but BranchFolder::OptimizeBranches does a lot of things like that.

...t;>>> machine basic blocks which is guaranteed to be the single predecessor >>>>>> to another block? Or is there a reason not to combine them? >>>>> >>>>> I'm not sure exactly what transformation you're referring to, but BranchFolder::OptimizeBranches does a lot of things like that. >>> >>> >> >

Hi Quentin, Yes, the code allows to process connected instructions. Although it should be taken into account that the instruction next to the current processed instruction must never be erased because this invalidates iterator. I've been fixing a bug in AArch64InstrInfo::optimizeCompareInstr: instructions are converted into S form but it's not checked that they produce the same flags as

...ESInstrInfo::RemoveBranch (this=0x92cf50c, MBB=...) at /work/llvm/trunk/llvm/lib/Target/ADRES/ADRESInstrInfo.cpp:364 #13 0x0892d513 in llvm::BranchFolder::OptimizeBlock (this=0xbfffea70, MBB=0x931bd14) at /work/llvm/trunk/llvm/lib/CodeGen/BranchFolding.cpp:1200 #14 0x0892c565 in llvm::BranchFolder::OptimizeBranches (this=0xbfffea70, MF=...) at /work/llvm/trunk/llvm/lib/CodeGen/BranchFolding.cpp:972 #15 0x089298c2 in llvm::BranchFolder::OptimizeFunction (this=0xbfffea70, MF=..., tii=0x92cf50c, tri=0x92cf528, mmi=0x92f1228) at /work/llvm/trunk/llvm/lib/CodeGen/BranchFolding.cpp:208 #16 0x08929150 in (anonymous...