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[DAGCombiner] Add support for TRUNCATE + FP_EXTEND vector constant folding

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This patch adds supports for the vector constant folding of TRUNCATE and FP_EXTEND instructions and tidies up the SINT_TO_FP and UINT_TO_FP instructions to match.

It also moves the vector constant folding for the FNEG and FABS instructions to use the DAG.getNode() functionality like the other unary instructions.

Differential Revision: http://reviews.llvm.org/D8593

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233224 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Simon Pilgrim
2015-03-25 22:30:31 +00:00
parent 00aafa5d73
commit eb32048f80
5 changed files with 83 additions and 55 deletions
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include/llvm/CodeGen/SelectionDAGNodes.h
+4
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@@ -94,6 +94,10 @@ namespace ISD {
/// all ConstantSDNode or undef.
bool isBuildVectorOfConstantSDNodes(const SDNode *N);
/// \brief Return true if the specified node is a BUILD_VECTOR node of
/// all ConstantFPSDNode or undef.
bool isBuildVectorOfConstantFPSDNodes(const SDNode *N);
/// 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.