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Fix CellSPU vector shuffles, again.

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Some cases of lowering to rotate were miscompiled.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113355 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kalle Raiskila
2010-09-08 11:53:38 +00:00
parent c8ae35a8e8
commit 0b4ab0cfe0
2 changed files with 33 additions and 7 deletions
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14
lib/Target/CellSPU/SPUISelLowering.cpp
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@@ -1735,9 +1735,9 @@ static SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) {
unsigned CurrElt = 0;
unsigned MaxElts = VecVT.getVectorNumElements();
unsigned PrevElt = 0;
unsigned V0Elt = 0;
bool monotonic = true;
bool rotate = true;
int rotamt;
EVT maskVT; // which of the c?d instructions to use
if (EltVT == MVT::i8) {
@@ -1781,14 +1781,13 @@ static SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) {
if (PrevElt > 0 && SrcElt < MaxElts) {
if ((PrevElt == SrcElt - 1)
|| (PrevElt == MaxElts - 1 && SrcElt == 0)) {
rotamt = SrcElt-i;
PrevElt = SrcElt;
if (SrcElt == 0)
V0Elt = i;
} else {
rotate = false;
}
} else if (i == 0) {
// First time through, need to keep track of previous element
} else if (i == 0 || (PrevElt==0 && SrcElt==1)) {
// First time or after a "wrap around"
PrevElt = SrcElt;
} else {
// This isn't a rotation, takes elements from vector 2
@@ -1813,8 +1812,9 @@ static SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) {
return DAG.getNode(SPUISD::SHUFB, dl, V1.getValueType(), V2, V1,
ShufMaskOp);
} else if (rotate) {
int rotamt = (MaxElts - V0Elt) * EltVT.getSizeInBits()/8;
if (rotamt < 0)
rotamt +=MaxElts;
rotamt *= EltVT.getSizeInBits()/8;
return DAG.getNode(SPUISD::ROTBYTES_LEFT, dl, V1.getValueType(),
V1, DAG.getConstant(rotamt, MVT::i16));
} else {