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Implement PPC::isSplatShuffleMask and PPC::getVSPLTImmediate. 

llvm-svn: 26897
This commit is contained in:
Chris Lattner 2006-03-20 06:37:44 +00:00
parent ffc475689b
commit a8fbb6dd3d
1 changed files with 13 additions and 2 deletions
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15
llvm/lib/Target/PowerPC/PPCISelLowering.cpp
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@ -245,14 +245,25 @@ static bool isFloatingPointZero(SDOperand Op) {
/// VSPLTB/VSPLTH/VSPLTW.
bool PPC::isSplatShuffleMask(SDNode *N) {
assert(N->getOpcode() == ISD::BUILD_VECTOR);
return false;
// This is a splat operation if each element of the permute is the same, and
// if the value doesn't reference the second vector.
SDOperand Elt = N->getOperand(0);
assert(isa<ConstantSDNode>(Elt) && "Invalid VECTOR_SHUFFLE mask!");
for (unsigned i = 1, e = N->getNumOperands(); i != e; ++i) {
assert(isa<ConstantSDNode>(N->getOperand(i)) &&
"Invalid VECTOR_SHUFFLE mask!");
if (N->getOperand(i) != Elt) return false;
}
// Make sure it is a splat of the first vector operand.
return cast<ConstantSDNode>(Elt)->getValue() < N->getNumOperands();
}
/// getVSPLTImmediate - Return the appropriate VSPLT* immediate to splat the
/// specified isSplatShuffleMask VECTOR_SHUFFLE mask.
unsigned PPC::getVSPLTImmediate(SDNode *N) {
assert(isSplatShuffleMask(N));
return 0;
return cast<ConstantSDNode>(N)->getValue();
}