2nd attempt, fixing SSE4.1 issues and implementing feedback from duncan.

PR2957

ISD::VECTOR_SHUFFLE now stores an array of integers representing the shuffle
mask internal to the node, rather than taking a BUILD_VECTOR of ConstantSDNodes
as the shuffle mask.  A value of -1 represents UNDEF.

In addition to eliminating the creation of illegal BUILD_VECTORS just to 
represent shuffle masks, we are better about canonicalizing the shuffle mask,
resulting in substantially better code for some classes of shuffles.

llvm-svn: 70225

1 files changed, 1 insertions, 5 deletions

diff --git a/llvm/utils/TableGen/CodeGenDAGPatterns.h b/llvm/utils/TableGen/CodeGenDAGPatterns.h
index f1b0d37605b..9ce14dcc7b3 100644
--- a/llvm/utils/TableGen/CodeGenDAGPatterns.h
+++ b/llvm/utils/TableGen/CodeGenDAGPatterns.h
@@ -62,8 +62,7 @@ struct SDTypeConstraint {
   unsigned OperandNo;   // The operand # this constraint applies to.
   enum { 
     SDTCisVT, SDTCisPtrTy, SDTCisInt, SDTCisFP, SDTCisSameAs, 
-    SDTCisVTSmallerThanOp, SDTCisOpSmallerThanOp, SDTCisIntVectorOfSameSize,
-    SDTCisEltOfVec
+    SDTCisVTSmallerThanOp, SDTCisOpSmallerThanOp, SDTCisEltOfVec
   } ConstraintType;
   
   union {   // The discriminated union.
@@ -81,9 +80,6 @@ struct SDTypeConstraint {
     } SDTCisOpSmallerThanOp_Info;
     struct {
       unsigned OtherOperandNum;
-    } SDTCisIntVectorOfSameSize_Info;
-    struct {
-      unsigned OtherOperandNum;
     } SDTCisEltOfVec_Info;
   } x;