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Minor change. Fix comments and remove unused and redundant code

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113378 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bruno Cardoso Lopes 2010-09-08 18:12:31 +00:00
parent b629dcca72
commit 0a7dd4fa40
1 changed files with 3 additions and 10 deletions
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13
lib/Target/X86/X86ISelLowering.cpp
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@ -4891,10 +4891,10 @@ SDValue LowerVECTOR_SHUFFLEv16i8(ShuffleVectorSDNode *SVOp,
}
/// RewriteAsNarrowerShuffle - Try rewriting v8i16 and v16i8 shuffles as 4 wide
/// ones, or rewriting v4i32 / v2i32 as 2 wide ones if possible. This can be
/// ones, or rewriting v4i32 / v4f32 as 2 wide ones if possible. This can be
/// done when every pair / quad of shuffle mask elements point to elements in
/// the right sequence. e.g.
/// vector_shuffle <>, <>, < 3, 4, | 10, 11, | 0, 1, | 14, 15>
/// vector_shuffle X, Y, <2, 3, | 10, 11, | 0, 1, | 14, 15>
static
SDValue RewriteAsNarrowerShuffle(ShuffleVectorSDNode *SVOp,
SelectionDAG &DAG, DebugLoc dl) {
@ -4903,8 +4903,7 @@ SDValue RewriteAsNarrowerShuffle(ShuffleVectorSDNode *SVOp,
SDValue V2 = SVOp->getOperand(1);
unsigned NumElems = VT.getVectorNumElements();
unsigned NewWidth = (NumElems == 4) ? 2 : 4;
EVT MaskVT = (NewWidth == 4) ? MVT::v4i16 : MVT::v2i32;
EVT NewVT = MaskVT;
EVT NewVT;
switch (VT.getSimpleVT().SimpleTy) {
default: assert(false && "Unexpected!");
case MVT::v4f32: NewVT = MVT::v2f64; break;
@ -4913,12 +4912,6 @@ SDValue RewriteAsNarrowerShuffle(ShuffleVectorSDNode *SVOp,
case MVT::v16i8: NewVT = MVT::v4i32; break;
}
if (NewWidth == 2) {
if (VT.isInteger())
NewVT = MVT::v2i64;
else
NewVT = MVT::v2f64;
}
int Scale = NumElems / NewWidth;
SmallVector<int, 8> MaskVec;
for (unsigned i = 0; i < NumElems; i += Scale) {