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Added support to allow clients to custom widen. For X86, custom widen vectors for

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divide/remainder since these operations can trap by unroll them and adding undefs
for the resulting vector.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90108 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Mon P Wang
2009-11-30 02:42:02 +00:00
parent 366429b400
commit cd6e725f21
7 changed files with 121 additions and 56 deletions
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8
include/llvm/CodeGen/SelectionDAG.h
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@@ -882,6 +882,14 @@ public:
/// element of the result of the vector shuffle.
SDValue getShuffleScalarElt(const ShuffleVectorSDNode *N, unsigned Idx);
/// UnrollVectorOp - Utility function used by legalize and lowering to
/// "unroll" a vector operation by splitting out the scalars and operating
/// on each element individually. If the ResNE is 0, fully unroll the vector
/// op. If ResNE is less than the width of the vector op, unroll up to ResNE.
/// If the ResNE is greater than the width of the vector op, unroll the
/// vector op and fill the end of the resulting vector with UNDEFS.
SDValue UnrollVectorOp(SDNode *N, unsigned ResNE = 0);
private:
bool RemoveNodeFromCSEMaps(SDNode *N);
void AddModifiedNodeToCSEMaps(SDNode *N, DAGUpdateListener *UpdateListener);