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minor simplifications to this code, don't create a dead

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SCALAR_TO_VECTOR on paths that end up not using it.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48056 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-03-08 22:48:29 +00:00
parent b607f9c822
commit c9517fb6eb
1 changed files with 10 additions and 6 deletions
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16
lib/Target/X86/X86ISelLowering.cpp
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@ -3024,7 +3024,7 @@ X86TargetLowering::LowerBUILD_VECTOR(SDOperand Op, SelectionDAG &DAG) {
unsigned NumZero = 0;
unsigned NumNonZero = 0;
unsigned NonZeros = 0;
bool HasNonImms = false;
bool IsAllConstants = true;
SmallSet<SDOperand, 8> Values;
for (unsigned i = 0; i < NumElems; ++i) {
SDOperand Elt = Op.getOperand(i);
@ -3033,7 +3033,7 @@ X86TargetLowering::LowerBUILD_VECTOR(SDOperand Op, SelectionDAG &DAG) {
Values.insert(Elt);
if (Elt.getOpcode() != ISD::Constant &&
Elt.getOpcode() != ISD::ConstantFP)
HasNonImms = true;
IsAllConstants = false;
if (isZeroNode(Elt))
NumZero++;
else {
@ -3055,15 +3055,19 @@ X86TargetLowering::LowerBUILD_VECTOR(SDOperand Op, SelectionDAG &DAG) {
if (NumNonZero == 1 && NumElems <= 4) {
unsigned Idx = CountTrailingZeros_32(NonZeros);
SDOperand Item = Op.getOperand(Idx);
Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, VT, Item);
if (Idx == 0)
if (Idx == 0) {
Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, VT, Item);
// Turn it into a MOVL (i.e. movss, movsd, or movd) to a zero vector.
return getShuffleVectorZeroOrUndef(Item, VT, NumElems, Idx,
NumZero > 0, DAG);
else if (!HasNonImms) // Otherwise, it's better to do a constpool load.
}
if (IsAllConstants) // Otherwise, it's better to do a constpool load.
return SDOperand();
if (EVTBits == 32) {
Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, VT, Item);
// Turn it into a shuffle of zero and zero-extended scalar to vector.
Item = getShuffleVectorZeroOrUndef(Item, VT, NumElems, 0, NumZero > 0,
DAG);
@ -3081,7 +3085,7 @@ X86TargetLowering::LowerBUILD_VECTOR(SDOperand Op, SelectionDAG &DAG) {
// A vector full of immediates; various special cases are already
// handled, so this is best done with a single constant-pool load.
if (!HasNonImms)
if (IsAllConstants)
return SDOperand();
// Let legalizer expand 2-wide build_vectors.