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- When DAG combiner is folding a bit convert into a BUILD_VECTOR, it should check if it's essentially a SCALAR_TO_VECTOR. Avoid turning (v8i16) <10, u, u, u> to <10, 0, u, u, u, u, u, u>. Instead, simply convert it to a SCALAR_TO_VECTOR of the proper type.

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- X86 now normalize SCALAR_TO_VECTOR to (BIT_CONVERT (v4i32 SCALAR_TO_VECTOR)). Get rid of X86ISD::S2VEC.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47290 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-02-18 23:04:32 +00:00
parent e0cfecf47d
commit efec751a1b
8 changed files with 128 additions and 59 deletions
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21
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@@ -176,6 +176,27 @@ bool ISD::isBuildVectorAllZeros(const SDNode *N) {
return true;
}
/// isScalarToVector - Return true if the specified node is a
/// ISD::SCALAR_TO_VECTOR node or a BUILD_VECTOR node where only the low
/// element is not an undef.
bool ISD::isScalarToVector(const SDNode *N) {
if (N->getOpcode() == ISD::SCALAR_TO_VECTOR)
return true;
if (N->getOpcode() != ISD::BUILD_VECTOR)
return false;
if (N->getOperand(0).getOpcode() == ISD::UNDEF)
return false;
unsigned NumElems = N->getNumOperands();
for (unsigned i = 1; i < NumElems; ++i) {
SDOperand V = N->getOperand(i);
if (V.getOpcode() != ISD::UNDEF)
return false;
}
return true;
}
/// isDebugLabel - Return true if the specified node represents a debug
/// label (i.e. ISD::LABEL or TargetInstrInfo::LABEL node and third operand
/// is 0).