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[SystemZ] Improve spilling of LGDR and LDGR

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If the source of these instructions is spilled we should load the destination.
If the destination is spilled we should store the source.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186147 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Sandiford
2013-07-12 08:37:17 +00:00
parent a10369920f
commit 6cf3cfa0ab
2 changed files with 311 additions and 1 deletions
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24
lib/Target/SystemZ/SystemZInstrInfo.cpp
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@@ -368,6 +368,28 @@ SystemZInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
.getRegClass(MI->getOperand(OpNum).getReg())->getSize() &&
"Invalid size combination");
unsigned Opcode = MI->getOpcode();
if (Opcode == SystemZ::LGDR || Opcode == SystemZ::LDGR) {
bool Op0IsGPR = (Opcode == SystemZ::LGDR);
bool Op1IsGPR = (Opcode == SystemZ::LDGR);
// If we're spilling the destination of an LDGR or LGDR, store the
// source register instead.
if (OpNum == 0) {
unsigned StoreOpcode = Op1IsGPR ? SystemZ::STG : SystemZ::STD;
return BuildMI(MF, MI->getDebugLoc(), get(StoreOpcode))
.addOperand(MI->getOperand(1)).addFrameIndex(FrameIndex)
.addImm(0).addReg(0);
}
// If we're spilling the source of an LDGR or LGDR, load the
// destination register instead.
if (OpNum == 1) {
unsigned LoadOpcode = Op0IsGPR ? SystemZ::LG : SystemZ::LD;
unsigned Dest = MI->getOperand(0).getReg();
return BuildMI(MF, MI->getDebugLoc(), get(LoadOpcode), Dest)
.addFrameIndex(FrameIndex).addImm(0).addReg(0);
}
}
// Look for cases where the source of a simple store or the destination
// of a simple load is being spilled. Try to use MVC instead.
//
@@ -399,7 +421,7 @@ SystemZInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
// If the spilled operand is the final one, try to change <INSN>R
// into <INSN>.
int MemOpcode = SystemZ::getMemOpcode(MI->getOpcode());
int MemOpcode = SystemZ::getMemOpcode(Opcode);
if (MemOpcode >= 0) {
unsigned NumOps = MI->getNumExplicitOperands();
if (OpNum == NumOps - 1) {