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When using MachineInstr operand indices on SDNodes, the number

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of MachineInstr def operands must be subtracted out. This bug
was uncovered by the recent x86 EFLAGS optimization. Before
that, the only instructions that ever needed unfolding were
things like CMP32rm, where NumDefs is zero.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66056 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-03-04 19:23:38 +00:00
parent 88fe1ad187
commit b37a8206b6
1 changed files with 4 additions and 3 deletions

7
lib/Target/X86/X86InstrInfo.cpp

@ -2382,6 +2382,7 @@ X86InstrInfo::unfoldMemoryOperand(SelectionDAG &DAG, SDNode *N,
const TargetOperandInfo &TOI = TID.OpInfo[Index];
const TargetRegisterClass *RC = TOI.isLookupPtrRegClass()
? RI.getPointerRegClass() : RI.getRegClass(TOI.RegClass);
unsigned NumDefs = TID.NumDefs;
std::vector<SDValue> AddrOps;
std::vector<SDValue> BeforeOps;
std::vector<SDValue> AfterOps;
@ -2389,11 +2390,11 @@ X86InstrInfo::unfoldMemoryOperand(SelectionDAG &DAG, SDNode *N,
unsigned NumOps = N->getNumOperands();
for (unsigned i = 0; i != NumOps-1; ++i) {
SDValue Op = N->getOperand(i);
if (i >= Index && i < Index+4)
if (i >= Index-NumDefs && i < Index-NumDefs+4)
AddrOps.push_back(Op);
else if (i < Index)
else if (i < Index-NumDefs)
BeforeOps.push_back(Op);
else if (i > Index)
else if (i > Index-NumDefs)
AfterOps.push_back(Op);
}
SDValue Chain = N->getOperand(NumOps-1);