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Remove the now unused LiveIntervals::getVNInfoSourceReg().

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This method was always a bit too simplistic for the real world. It didn't really
deal with subregisters and such.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106781 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-06-24 20:18:15 +00:00
parent c0490ac915
commit 3c7b3fecac
2 changed files with 0 additions and 35 deletions
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4
include/llvm/CodeGen/LiveIntervalAnalysis.h
View File

@ -228,10 +228,6 @@ namespace llvm {
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();

31
lib/CodeGen/LiveIntervalAnalysis.cpp
View File

@ -783,37 +783,6 @@ LiveInterval* LiveIntervals::dupInterval(LiveInterval *li) {
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.
//