VNInfo::Allocator& getVNInfoAllocator() { return VNInfoAllocator; }
- /// getVNInfoSourceReg - Helper function that parses the specified VNInfo
- /// copy field and returns the source register that defines it.
- unsigned getVNInfoSourceReg(const VNInfo *VNI) const;
-
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
virtual void releaseMemory();
return NewLI;
}
-/// getVNInfoSourceReg - Helper function that parses the specified VNInfo
-/// copy field and returns the source register that defines it.
-unsigned LiveIntervals::getVNInfoSourceReg(const VNInfo *VNI) const {
- if (!VNI->getCopy())
- return 0;
-
- if (VNI->getCopy()->isExtractSubreg()) {
- // If it's extracting out of a physical register, return the sub-register.
- unsigned Reg = VNI->getCopy()->getOperand(1).getReg();
- if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
- unsigned SrcSubReg = VNI->getCopy()->getOperand(2).getImm();
- unsigned DstSubReg = VNI->getCopy()->getOperand(0).getSubReg();
- if (SrcSubReg == DstSubReg)
- // %reg1034:3<def> = EXTRACT_SUBREG %EDX, 3
- // reg1034 can still be coalesced to EDX.
- return Reg;
- assert(DstSubReg == 0);
- Reg = tri_->getSubReg(Reg, VNI->getCopy()->getOperand(2).getImm());
- }
- return Reg;
- } else if (VNI->getCopy()->isInsertSubreg() ||
- VNI->getCopy()->isSubregToReg())
- return VNI->getCopy()->getOperand(2).getReg();
-
- unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
- if (tii_->isMoveInstr(*VNI->getCopy(), SrcReg, DstReg, SrcSubReg, DstSubReg))
- return SrcReg;
- llvm_unreachable("Unrecognized copy instruction!");
- return 0;
-}
-
//===----------------------------------------------------------------------===//
// Register allocator hooks.
//