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Allow use of the 16-bit literal move instruction in CMOVs for Thumb2 mode.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115890 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach
2010-10-07 00:53:56 +00:00
parent 511c686f76
commit a4257162be
3 changed files with 25 additions and 12 deletions
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16
lib/Target/ARM/ARMISelDAGToDAG.cpp
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@@ -190,7 +190,7 @@ private:
SDNode *SelectARMCMOVShiftOp(SDNode *N, SDValue FalseVal, SDValue TrueVal,
ARMCC::CondCodes CCVal, SDValue CCR,
SDValue InFlag);
SDNode *SelectT2CMOVSoImmOp(SDNode *N, SDValue FalseVal, SDValue TrueVal,
SDNode *SelectT2CMOVImmOp(SDNode *N, SDValue FalseVal, SDValue TrueVal,
ARMCC::CondCodes CCVal, SDValue CCR,
SDValue InFlag);
SDNode *SelectARMCMOVImmOp(SDNode *N, SDValue FalseVal, SDValue TrueVal,
@@ -1504,18 +1504,20 @@ SelectARMCMOVShiftOp(SDNode *N, SDValue FalseVal, SDValue TrueVal,
}
SDNode *ARMDAGToDAGISel::
SelectT2CMOVSoImmOp(SDNode *N, SDValue FalseVal, SDValue TrueVal,
SelectT2CMOVImmOp(SDNode *N, SDValue FalseVal, SDValue TrueVal,
ARMCC::CondCodes CCVal, SDValue CCR, SDValue InFlag) {
ConstantSDNode *T = dyn_cast<ConstantSDNode>(TrueVal);
if (!T)
return 0;
if (Pred_t2_so_imm(TrueVal.getNode())) {
unsigned TrueImm = T->getZExtValue();
bool isSoImm = Pred_t2_so_imm(TrueVal.getNode());
if (isSoImm || TrueImm <= 0xffff) {
SDValue True = CurDAG->getTargetConstant(T->getZExtValue(), MVT::i32);
SDValue CC = CurDAG->getTargetConstant(CCVal, MVT::i32);
SDValue Ops[] = { FalseVal, True, CC, CCR, InFlag };
return CurDAG->SelectNodeTo(N,
ARM::t2MOVCCi, MVT::i32, Ops, 5);
return CurDAG->SelectNodeTo(N, (isSoImm ? ARM::t2MOVCCi : ARM::t2MOVCCi16),
MVT::i32, Ops, 5);
}
return 0;
}
@@ -1583,10 +1585,10 @@ SDNode *ARMDAGToDAGISel::SelectCMOVOp(SDNode *N) {
// (so_imm:i32 (imm:i32):$true), (imm:i32):$cc)
// Pattern complexity = 10 cost = 1 size = 0
if (Subtarget->isThumb()) {
SDNode *Res = SelectT2CMOVSoImmOp(N, FalseVal, TrueVal,
SDNode *Res = SelectT2CMOVImmOp(N, FalseVal, TrueVal,
CCVal, CCR, InFlag);
if (!Res)
Res = SelectT2CMOVSoImmOp(N, TrueVal, FalseVal,
Res = SelectT2CMOVImmOp(N, TrueVal, FalseVal,
ARMCC::getOppositeCondition(CCVal), CCR, InFlag);
if (Res)
return Res;