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Fix a bug in the lowering of broadcasts: ConstantPools need to use the target pointer type.

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Move NormalizeVectorShuffle and LowerVectorBroadcast into X86TargetLowering.

llvm-svn: 154310
This commit is contained in:
Nadav Rotem 2012-04-09 07:45:58 +00:00
parent b06257c64d
commit 4499fb1d50
3 changed files with 27 additions and 19 deletions
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30
lib/Target/X86/X86ISelLowering.cpp
View File

@ -4859,12 +4859,13 @@ static SDValue EltsFromConsecutiveLoads(EVT VT, SmallVectorImpl<SDValue> &Elts,
/// a scalar load, or a constant.
/// The VBROADCAST node is returned when a pattern is found,
/// or SDValue() otherwise.
static SDValue LowerVectorBroadcast(SDValue &Op, const X86Subtarget *Subtarget,
DebugLoc &dl, SelectionDAG &DAG) {
SDValue
X86TargetLowering::LowerVectorBroadcast(SDValue &Op, SelectionDAG &DAG) const {
if (!Subtarget->hasAVX())
return SDValue();
EVT VT = Op.getValueType();
DebugLoc dl = Op.getDebugLoc();
SDValue Ld;
bool ConstSplatVal;
@ -4905,7 +4906,7 @@ static SDValue LowerVectorBroadcast(SDValue &Op, const X86Subtarget *Subtarget,
Ld = Sc.getOperand(0);
ConstSplatVal = (Ld.getOpcode() == ISD::Constant ||
Ld.getOpcode() == ISD::ConstantFP);
Ld.getOpcode() == ISD::ConstantFP);
// The scalar_to_vector node and the suspected
// load node must have exactly one user.
@ -4930,11 +4931,6 @@ static SDValue LowerVectorBroadcast(SDValue &Op, const X86Subtarget *Subtarget,
if ((Is256 && (ScalarSize == 32 || ScalarSize == 64)) ||
(Is128 && (ScalarSize == 32))) {
// This is the type of the load operation for the constant that we save
// in the constant pool. We can't load float values from the constant pool
// because the DAG has to be legal at this stage.
MVT LdTy = (ScalarSize == 32 ? MVT::i32 : MVT::i64);
const Constant *C = 0;
if (ConstantSDNode *CI = dyn_cast<ConstantSDNode>(Ld))
C = CI->getConstantIntValue();
@ -4943,14 +4939,12 @@ static SDValue LowerVectorBroadcast(SDValue &Op, const X86Subtarget *Subtarget,
assert(C && "Invalid constant type");
SDValue CP = DAG.getConstantPool(C, LdTy);
SDValue CP = DAG.getConstantPool(C, getPointerTy());
unsigned Alignment = cast<ConstantPoolSDNode>(CP)->getAlignment();
Ld = DAG.getLoad(LdTy, dl, DAG.getEntryNode(), CP,
Ld = DAG.getLoad(CVT, dl, DAG.getEntryNode(), CP,
MachinePointerInfo::getConstantPool(),
false, false, false, Alignment);
// Bitcast the loaded constant back to the requested type.
Ld = DAG.getNode(ISD::BITCAST, dl, CVT, Ld);
return DAG.getNode(X86ISD::VBROADCAST, dl, VT, Ld);
}
}
@ -5017,7 +5011,7 @@ X86TargetLowering::LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const {
return getOnesVector(VT, Subtarget->hasAVX2(), DAG, dl);
}
SDValue Broadcast = LowerVectorBroadcast(Op, Subtarget, dl, DAG);
SDValue Broadcast = LowerVectorBroadcast(Op, DAG);
if (Broadcast.getNode())
return Broadcast;
@ -6226,10 +6220,8 @@ SDValue getMOVLP(SDValue &Op, DebugLoc &dl, SelectionDAG &DAG, bool HasSSE2) {
getShuffleSHUFImmediate(SVOp), DAG);
}
static
SDValue NormalizeVectorShuffle(SDValue Op, SelectionDAG &DAG,
const TargetLowering &TLI,
const X86Subtarget *Subtarget) {
SDValue
X86TargetLowering::NormalizeVectorShuffle(SDValue Op, SelectionDAG &DAG) const {
ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
EVT VT = Op.getValueType();
DebugLoc dl = Op.getDebugLoc();
@ -6245,7 +6237,7 @@ SDValue NormalizeVectorShuffle(SDValue Op, SelectionDAG &DAG,
int Size = VT.getSizeInBits();
// Use vbroadcast whenever the splat comes from a foldable load
SDValue Broadcast = LowerVectorBroadcast(Op, Subtarget, dl, DAG);
SDValue Broadcast = LowerVectorBroadcast(Op, DAG);
if (Broadcast.getNode())
return Broadcast;
@ -6332,7 +6324,7 @@ X86TargetLowering::LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const {
// Normalize the input vectors. Here splats, zeroed vectors, profitable
// narrowing and commutation of operands should be handled. The actual code
// doesn't include all of those, work in progress...
SDValue NewOp = NormalizeVectorShuffle(Op, DAG, *this, Subtarget);
SDValue NewOp = NormalizeVectorShuffle(Op, DAG);
if (NewOp.getNode())
return NewOp;

2
lib/Target/X86/X86ISelLowering.h
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@ -780,6 +780,8 @@ namespace llvm {
// Utility functions to help LowerVECTOR_SHUFFLE
SDValue LowerVECTOR_SHUFFLEv8i16(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerVectorBroadcast(SDValue &Op, SelectionDAG &DAG) const;
SDValue NormalizeVectorShuffle(SDValue Op, SelectionDAG &DAG) const;
virtual SDValue
LowerFormalArguments(SDValue Chain,

14
test/CodeGen/X86/avx2-vbroadcast.ll
View File

@ -171,3 +171,17 @@ define <4 x float> @_e2(float* %ptr) nounwind uwtable readnone ssp {
ret <4 x float> %vecinit6.i
}
; CHECK: _e4
; CHECK-NOT: broadcast
; CHECK: ret
define <8 x i8> @_e4(i8* %ptr) nounwind uwtable readnone ssp {
%vecinit0.i = insertelement <8 x i8> undef, i8 52, i32 0
%vecinit1.i = insertelement <8 x i8> %vecinit0.i, i8 52, i32 1
%vecinit2.i = insertelement <8 x i8> %vecinit1.i, i8 52, i32 2
%vecinit3.i = insertelement <8 x i8> %vecinit2.i, i8 52, i32 3
%vecinit4.i = insertelement <8 x i8> %vecinit3.i, i8 52, i32 3
%vecinit5.i = insertelement <8 x i8> %vecinit4.i, i8 52, i32 3
%vecinit6.i = insertelement <8 x i8> %vecinit5.i, i8 52, i32 3
%vecinit7.i = insertelement <8 x i8> %vecinit6.i, i8 52, i32 3
ret <8 x i8> %vecinit7.i
}