Make sure that arg regs used by the call instruction are marked as such, so
that regalloc doesn't cleverly reuse early arg regs loading later arg regs.
This fixes almost all outstanding failures in the pattern isel.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21086 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCISelPattern.cpp b/lib/Target/PowerPC/PPCISelPattern.cpp
index 8751f42..dfd2d54 100644
--- a/lib/Target/PowerPC/PPCISelPattern.cpp
+++ b/lib/Target/PowerPC/PPCISelPattern.cpp
@@ -1069,6 +1069,24 @@
Select(N.getOperand(0));
ExprMap[N.getValue(Node->getNumValues()-1)] = 1;
+ MachineInstr *CallMI;
+ // Emit the correct call instruction based on the type of symbol called.
+ if (GlobalAddressSDNode *GASD =
+ dyn_cast<GlobalAddressSDNode>(N.getOperand(1))) {
+ CallMI = BuildMI(PPC::CALLpcrel, 1).addGlobalAddress(GASD->getGlobal(),
+ true);
+ } else if (ExternalSymbolSDNode *ESSDN =
+ dyn_cast<ExternalSymbolSDNode>(N.getOperand(1))) {
+ CallMI = BuildMI(PPC::CALLpcrel, 1).addExternalSymbol(ESSDN->getSymbol(),
+ true);
+ } else {
+ Tmp1 = SelectExpr(N.getOperand(1));
+ BuildMI(BB, PPC::OR, 2, PPC::R12).addReg(Tmp1).addReg(Tmp1);
+ BuildMI(BB, PPC::MTCTR, 1).addReg(PPC::R12);
+ CallMI = BuildMI(PPC::CALLindirect, 3).addImm(20).addImm(0)
+ .addReg(PPC::R12);
+ }
+
// Load the register args to virtual regs
std::vector<unsigned> ArgVR;
for(int i = 2, e = Node->getNumOperands(); i < e; ++i)
@@ -1083,32 +1101,24 @@
case MVT::i16:
case MVT::i32:
assert(GPR_idx < 8 && "Too many int args");
- if (N.getOperand(i+2).getOpcode() != ISD::UNDEF)
+ if (N.getOperand(i+2).getOpcode() != ISD::UNDEF) {
BuildMI(BB, PPC::OR,2,GPR[GPR_idx]).addReg(ArgVR[i]).addReg(ArgVR[i]);
+ CallMI->addRegOperand(GPR[GPR_idx], MachineOperand::Use);
+ }
++GPR_idx;
break;
case MVT::f64:
case MVT::f32:
assert(FPR_idx < 13 && "Too many fp args");
BuildMI(BB, PPC::FMR, 1, FPR[FPR_idx]).addReg(ArgVR[i]);
+ CallMI->addRegOperand(FPR[FPR_idx], MachineOperand::Use);
++FPR_idx;
break;
}
}
-
- // Emit the correct call instruction based on the type of symbol called.
- if (GlobalAddressSDNode *GASD =
- dyn_cast<GlobalAddressSDNode>(N.getOperand(1))) {
- BuildMI(BB, PPC::CALLpcrel, 1).addGlobalAddress(GASD->getGlobal(), true);
- } else if (ExternalSymbolSDNode *ESSDN =
- dyn_cast<ExternalSymbolSDNode>(N.getOperand(1))) {
- BuildMI(BB, PPC::CALLpcrel, 1).addExternalSymbol(ESSDN->getSymbol(), true);
- } else {
- Tmp1 = SelectExpr(N.getOperand(1));
- BuildMI(BB, PPC::OR, 2, PPC::R12).addReg(Tmp1).addReg(Tmp1);
- BuildMI(BB, PPC::MTCTR, 1).addReg(PPC::R12);
- BuildMI(BB, PPC::CALLindirect, 3).addImm(20).addImm(0).addReg(PPC::R12);
- }
+
+ // Put the call instruction in the correct place in the MachineBasicBlock
+ BB->push_back(CallMI);
switch (Node->getValueType(0)) {
default: assert(0 && "Unknown value type for call result!");