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simplify code a bit and add a more explanatory assert for cases that

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previously would result in 'cannot yet select' errors.

llvm-svn: 106199
This commit is contained in:
Jim Grosbach 2010-06-17 01:37:00 +00:00
parent 830bbc15f4
commit 8d77e0298c
1 changed files with 11 additions and 15 deletions
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26
lib/Target/ARM/ARMISelLowering.cpp
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@ -1857,22 +1857,18 @@ static SDValue LowerMEMBARRIER(SDValue Op, SelectionDAG &DAG,
const ARMSubtarget *Subtarget) {
DebugLoc dl = Op.getDebugLoc();
SDValue Op5 = Op.getOperand(5);
SDValue Res;
unsigned isDeviceBarrier = cast<ConstantSDNode>(Op5)->getZExtValue();
if (isDeviceBarrier) {
if (Subtarget->hasV7Ops())
Res = DAG.getNode(ARMISD::SYNCBARRIER, dl, MVT::Other, Op.getOperand(0));
else
Res = DAG.getNode(ARMISD::SYNCBARRIER, dl, MVT::Other, Op.getOperand(0),
DAG.getConstant(0, MVT::i32));
} else {
if (Subtarget->hasV7Ops())
Res = DAG.getNode(ARMISD::MEMBARRIER, dl, MVT::Other, Op.getOperand(0));
else
Res = DAG.getNode(ARMISD::MEMBARRIER, dl, MVT::Other, Op.getOperand(0),
DAG.getConstant(0, MVT::i32));
}
return Res;
// v6 and v7 can both handle barriers directly, but need handled a bit
// differently. Thumb1 and pre-v6 ARM mode use a libcall instead and should
// never get here.
unsigned Opc = isDeviceBarrier ? ARMISD::SYNCBARRIER : ARMISD::MEMBARRIER;
if (Subtarget->hasV7Ops())
return DAG.getNode(Opc, dl, MVT::Other, Op.getOperand(0));
else if (Subtarget->hasV6Ops() && !Subtarget->isThumb1Only())
return DAG.getNode(Opc, dl, MVT::Other, Op.getOperand(0),
DAG.getConstant(0, MVT::i32));
assert(0 && "Unexpected ISD::MEMBARRIER encountered. Should be libcall!");
return SDValue();
}
static SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) {