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Fix X86FastISel's add folding to actually work, and not fall back

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to SelectionDAG.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107376 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-07-01 02:58:21 +00:00
parent 79b634c244
commit abd1d859b3
1 changed files with 8 additions and 4 deletions
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12
lib/Target/X86/X86FastISel.cpp
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@ -430,6 +430,14 @@ bool X86FastISel::X86SelectAddress(const Value *V, X86AddressMode &AM) {
if (const ConstantInt *CI = dyn_cast<ConstantInt>(Op)) {
// Constant-offset addressing.
Disp += CI->getSExtValue() * S;
} else if (isa<AddOperator>(Op) &&
isa<ConstantInt>(cast<AddOperator>(Op)->getOperand(1))) {
// An add with a constant operand. Fold the constant.
ConstantInt *CI =
cast<ConstantInt>(cast<AddOperator>(Op)->getOperand(1));
Disp += CI->getSExtValue() * S;
// Add the other operand back to the work list.
Worklist.push_back(cast<AddOperator>(Op)->getOperand(0));
} else if (IndexReg == 0 &&
(!AM.GV || !Subtarget->isPICStyleRIPRel()) &&
(S == 1 || S == 2 || S == 4 || S == 8)) {
@ -438,10 +446,6 @@ bool X86FastISel::X86SelectAddress(const Value *V, X86AddressMode &AM) {
IndexReg = getRegForGEPIndex(Op).first;
if (IndexReg == 0)
return false;
} else if (const AddOperator *Add = dyn_cast<AddOperator>(Op)) {
// An add. Try to fold both operands.
Worklist.push_back(Add->getOperand(0));
Worklist.push_back(Add->getOperand(1));
} else
// Unsupported.
goto unsupported_gep;