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Do not use movs{h|l}dup for a shuffle with a single non-undef node. 

llvm-svn: 27718
This commit is contained in:
Evan Cheng 2006-04-15 03:13:24 +00:00
parent 39fac448d6
commit 65bb720a8b
1 changed files with 14 additions and 2 deletions
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16
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -1724,12 +1724,14 @@ bool X86::isMOVSHDUPMask(SDNode *N) {
return false;
// Expect 1, 1, 3, 3
unsigned NumNodes = 0;
for (unsigned i = 0; i < 2; ++i) {
SDOperand Arg = N->getOperand(i);
if (Arg.getOpcode() == ISD::UNDEF) continue;
assert(isa<ConstantSDNode>(Arg) && "Invalid VECTOR_SHUFFLE mask!");
unsigned Val = cast<ConstantSDNode>(Arg)->getValue();
if (Val != 1) return false;
NumNodes++;
}
for (unsigned i = 2; i < 4; ++i) {
SDOperand Arg = N->getOperand(i);
@ -1737,8 +1739,12 @@ bool X86::isMOVSHDUPMask(SDNode *N) {
assert(isa<ConstantSDNode>(Arg) && "Invalid VECTOR_SHUFFLE mask!");
unsigned Val = cast<ConstantSDNode>(Arg)->getValue();
if (Val != 3) return false;
NumNodes++;
}
return true;
// Don't use movshdup if the resulting vector contains only one undef node.
// Use {p}shuf* instead.
return NumNodes > 1;
}
/// isMOVSLDUPMask - Return true if the specified VECTOR_SHUFFLE operand
@ -1750,12 +1756,14 @@ bool X86::isMOVSLDUPMask(SDNode *N) {
return false;
// Expect 0, 0, 2, 2
unsigned NumNodes = 0;
for (unsigned i = 0; i < 2; ++i) {
SDOperand Arg = N->getOperand(i);
if (Arg.getOpcode() == ISD::UNDEF) continue;
assert(isa<ConstantSDNode>(Arg) && "Invalid VECTOR_SHUFFLE mask!");
unsigned Val = cast<ConstantSDNode>(Arg)->getValue();
if (Val != 0) return false;
NumNodes++;
}
for (unsigned i = 2; i < 4; ++i) {
SDOperand Arg = N->getOperand(i);
@ -1763,8 +1771,12 @@ bool X86::isMOVSLDUPMask(SDNode *N) {
assert(isa<ConstantSDNode>(Arg) && "Invalid VECTOR_SHUFFLE mask!");
unsigned Val = cast<ConstantSDNode>(Arg)->getValue();
if (Val != 2) return false;
NumNodes++;
}
return true;
// Don't use movsldup if the resulting vector contains only one undef node.
// Use {p}shuf* instead.
return NumNodes > 1;
}
/// isSplatMask - Return true if the specified VECTOR_SHUFFLE operand specifies