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simplify this code a bit now that "allocation to a vreg class" can never

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fail.

llvm-svn: 67616
This commit is contained in:
Chris Lattner 2009-03-24 15:22:11 +00:00
parent 7a9e8cbf79
commit a60dd19c3e
1 changed files with 13 additions and 16 deletions
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29
lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
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@ -4929,9 +4929,7 @@ GetRegistersForValue(SDISelAsmOperandInfo &OpInfo,
// Otherwise, if this was a reference to an LLVM register class, create vregs
// for this reference.
std::vector<unsigned> RegClassRegs;
const TargetRegisterClass *RC = PhysReg.second;
if (RC) {
if (PhysReg.second != 0) {
RegVT = *PhysReg.second->vt_begin();
if (OpInfo.ConstraintVT == MVT::Other)
ValueVT = RegVT;
@ -4943,13 +4941,14 @@ GetRegistersForValue(SDISelAsmOperandInfo &OpInfo,
OpInfo.AssignedRegs = RegsForValue(TLI, Regs, RegVT, ValueVT);
return;
} else {
// This is a reference to a register class that doesn't directly correspond
// to an LLVM register class. Allocate NumRegs consecutive, available,
// registers from the class.
RegClassRegs = TLI.getRegClassForInlineAsmConstraint(OpInfo.ConstraintCode,
OpInfo.ConstraintVT);
}
// This is a reference to a register class that doesn't directly correspond
// to an LLVM register class. Allocate NumRegs consecutive, available,
// registers from the class.
std::vector<unsigned> RegClassRegs
= TLI.getRegClassForInlineAsmConstraint(OpInfo.ConstraintCode,
OpInfo.ConstraintVT);
const TargetRegisterInfo *TRI = DAG.getTarget().getRegisterInfo();
unsigned NumAllocated = 0;
@ -4965,13 +4964,11 @@ GetRegistersForValue(SDISelAsmOperandInfo &OpInfo,
// Check to see if this register is allocatable (i.e. don't give out the
// stack pointer).
if (RC == 0) {
RC = isAllocatableRegister(Reg, MF, TLI, TRI);
if (!RC) { // Couldn't allocate this register.
// Reset NumAllocated to make sure we return consecutive registers.
NumAllocated = 0;
continue;
}
const TargetRegisterClass *RC = isAllocatableRegister(Reg, MF, TLI, TRI);
if (!RC) { // Couldn't allocate this register.
// Reset NumAllocated to make sure we return consecutive registers.
NumAllocated = 0;
continue;
}
// Okay, this register is good, we can use it.