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Remove redundant match for frame index from imm8 addrmode, it is handled by the imm12 addrmode.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77632 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Goodwin 2009-07-30 22:45:52 +00:00
parent 8f65253236
commit 07337c0fcf
1 changed files with 14 additions and 24 deletions
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38
lib/Target/ARM/ARMISelDAGToDAG.cpp
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@ -630,31 +630,21 @@ bool ARMDAGToDAGISel::SelectT2AddrModeImm12(SDValue Op, SDValue N,
bool ARMDAGToDAGISel::SelectT2AddrModeImm8(SDValue Op, SDValue N,
SDValue &Base, SDValue &OffImm) {
// Match simple R - imm8 operands.
// Match frame index...
if ((N.getOpcode() != ISD::ADD) && (N.getOpcode() != ISD::SUB)) {
if (N.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(N)->getIndex();
Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
OffImm = CurDAG->getTargetConstant(0, MVT::i32);
return true;
}
return false;
}
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
int RHSC = (int)RHS->getSExtValue();
if (N.getOpcode() == ISD::SUB)
RHSC = -RHSC;
if ((RHSC >= -255) && (RHSC <= 0)) { // 8 bits (always negative)
Base = N.getOperand(0);
if (Base.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(Base)->getIndex();
Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
if ((N.getOpcode() == ISD::ADD) || (N.getOpcode() == ISD::SUB)) {
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
int RHSC = (int)RHS->getSExtValue();
if (N.getOpcode() == ISD::SUB)
RHSC = -RHSC;
if ((RHSC >= -255) && (RHSC <= 0)) { // 8 bits (always negative)
Base = N.getOperand(0);
if (Base.getOpcode() == ISD::FrameIndex) {
int FI = cast<FrameIndexSDNode>(Base)->getIndex();
Base = CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());
}
OffImm = CurDAG->getTargetConstant(RHSC, MVT::i32);
return true;
}
OffImm = CurDAG->getTargetConstant(RHSC, MVT::i32);
return true;
}
}