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Allow i/s to match (gv+c). This fixes CodeGen/PowerPC/2007-05-03-InlineAsm-S-Constraint.ll

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and PR1382


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36672 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-05-03 16:54:34 +00:00
parent b0d151540d
commit 75c7d2bd55
1 changed files with 31 additions and 10 deletions
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41
lib/CodeGen/SelectionDAG/TargetLowering.cpp
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@ -1915,22 +1915,43 @@ SDOperand TargetLowering::isOperandValidForConstraint(SDOperand Op,
case 'i': // Simple Integer or Relocatable Constant
case 'n': // Simple Integer
case 's': // Relocatable Constant
case 'X': // Allows any operand.
// These are okay if the operand is either a global variable address or a
// simple immediate value. If we have one of these, map to the TargetXXX
// version so that the value itself doesn't get selected.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
case 'X': { // Allows any operand.
// These operands are interested in values of the form (GV+C), where C may
// be folded in as an offset of GV, or it may be explicitly added. Also, it
// is possible and fine if either GV or C are missing.
ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Op);
// If we have "(add GV, C)", pull out GV/C
if (Op.getOpcode() == ISD::ADD) {
C = dyn_cast<ConstantSDNode>(Op.getOperand(1));
GA = dyn_cast<GlobalAddressSDNode>(Op.getOperand(0));
if (C == 0 || GA == 0) {
C = dyn_cast<ConstantSDNode>(Op.getOperand(0));
GA = dyn_cast<GlobalAddressSDNode>(Op.getOperand(1));
}
if (C == 0 || GA == 0)
C = 0, GA = 0;
}
// If we find a valid operand, map to the TargetXXX version so that the
// value itself doesn't get selected.
if (GA) { // Either &GV or &GV+C
if (ConstraintLetter != 'n') {
int64_t Offs = GA->getOffset();
if (C) Offs += C->getValue();
return DAG.getTargetGlobalAddress(GA->getGlobal(), Op.getValueType(),
Offs);
}
}
if (C) { // just C, no GV.
// Simple constants are not allowed for 's'.
if (ConstraintLetter != 's')
return DAG.getTargetConstant(C->getValue(), Op.getValueType());
}
if (GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Op)) {
if (ConstraintLetter != 'n')
return DAG.getTargetGlobalAddress(GA->getGlobal(), Op.getValueType(),
GA->getOffset());
}
break;
}
}
return SDOperand(0,0);
}