search for: coalescerpair

...c5) #7 0x00000000026d4c42 bindingsErrorHandler(void*, std::string const&, bool) /d/en/johnsoni-0/gctools/llvm/lib/Support/ErrorHandling.cpp:127:0 #8 0x0000000001fdbc85 (anonymous namespace)::RegisterCoalescer::joinSubRegRanges(llvm::LiveRange&, llvm::LiveRange&, llvm::LaneBitmask, llvm::CoalescerPair const&) /d/en/johnsoni-0/gctools/llvm/lib/CodeGen/RegisterCoalescer.cpp:2695:0 #9 0x0000000001fdc3df (anonymous namespace)::RegisterCoalescer::mergeSubRangeInto(llvm::LiveInterval&, llvm::LiveRange const&, llvm::LaneBitmask, llvm::CoalescerPair&) /d/en/johnsoni-0/gctools/llvm/lib/Co...

...a register with sub registers. When making coalescing decisions it thinks that the virtual super reg interferes with sub reg instances, even though in reality they shouldn't conflict. That is, they are individual registers and would be better compared as such for register coalescing decisions (CoalescerPair::Partial = 0). For example, I have a super reg that has r20, r21, r22, and r23 physical registers. This super reg is the dest of a reg_sequence which generates 4 COPY MIs. The first COPY coalesces (merging into r20), but the vregs for r21-r23 (SUPER_RC:%vreg50:subreg1..subreg3) are never coalesced...

...a register with sub registers. When making coalescing decisions it thinks that the virtual super reg interferes with sub reg instances, even though in reality they shouldn't conflict. That is, they are individual registers and would be better compared as such for register coalescing decisions (CoalescerPair::Partial = 0). > > For example, I have a super reg that has r20, r21, r22, and r23 physical registers. This super reg is the dest of a reg_sequence which generates 4 COPY MIs. The first COPY coalesces (merging into r20), but the vregs for r21-r23 (SUPER_RC:%vreg50:subreg1..subreg3) are never...

I want to full understand register coalescing and how to coalesce copies. From what I have seen from "SimpleRegisterCoalescing," "RegAllocLinearSpan," and "RegAllocPBQP" there are three indicators for the copy instruction x = copy y. Assume that the value number of x does not equal the value number of y. For "x = copy y", let the boolean values a,b, and c,

...registers. When making coalescing decisions it thinks > that the virtual super reg interferes with sub reg instances, even though > in reality they shouldn't conflict. That is, they are individual registers > and would be better compared as such for register coalescing decisions > (CoalescerPair::Partial = 0). > > > > For example, I have a super reg that has r20, r21, r22, and r23 physical > registers. This super reg is the dest of a reg_sequence which generates 4 > COPY MIs. The first COPY coalesces (merging into r20), but the vregs for > r21-r23 (SUPER_RC:%vreg50:sub...

...Y %reg1060:ssub_2<kill> It will also replace the TargetInstrInfo::copyRegToReg hook when copying virtual registers: %reg1050 = COPY %reg1044<kill> It will be lowered with a TII.copyRegToReg() call in LowerSubregsInstructionPass (which may need renaming). Why? 1. The new function CoalescerPair::isMoveInstr() can correctly determine if a MachineInstr is a (partial) register copy with source and destination registers and subreg indices. I think that is the only place it is done correctly currently. Weird stuff like subreg indices on EXTRACT_SUBREG operands is pretty hard to figure out. The...

...instructions. For example, it's hard for me to read %reg1045:sub_32bit<def> = COPY %reg1044<kill> as updating part of reg1045. It's solvable by pretty printing COPY instructions that include register class information. > > > Why? > > > 1. The new function CoalescerPair::isMoveInstr() can correctly determine if a MachineInstr is a (partial) register copy with source and destination registers and subreg indices. I think that is the only place it is done correctly currently. Weird stuff like subreg indices on EXTRACT_SUBREG operands is pretty hard to figure out. The...

...t; >&)in libLLVMSelectionDAG.a(InstrEmitter.cpp.o) llvm::LiveStacks::getOrCreateInterval(int, llvm::TargetRegisterClass const*)in libLLVMCodeGen.a(PreAllocSplitting.cpp.o) llvm::VirtRegAuxInfo::CalculateRegClass(unsigned int)in libLLVMCodeGen.a(CalcSpillWeights.cpp.o) llvm::CoalescerPair::setRegisters(llvm::MachineInstr const*)in libLLVMCodeGen.a(RegisterCoalescer.cpp.o) llvm::CoalescerPair::setRegisters(llvm::MachineInstr const*)in libLLVMCodeGen.a(RegisterCoalescer.cpp.o) "llvm::TargetData::getCallFrameTypeAlignment(llvm::Type const*) const", referenced from:...