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Add support for breaking 256-bit int VETCC into two 128-bit ones, 

avoding scalarization of the compare. Reduces code from 59 to 6
instructions. Fix PR10712.

llvm-svn: 138271
This commit is contained in:
Bruno Cardoso Lopes 2011-08-22 20:31:04 +00:00
parent 6e62ca940a
commit 74f090d44c
2 changed files with 46 additions and 1 deletions
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36
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -8119,6 +8119,39 @@ SDValue X86TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
DAG.getConstant(X86CC, MVT::i8), EFLAGS);
}
// Lower256IntVETCC - Break a VSETCC 256-bit integer VSETCC into two new 128
// ones, and then concatenate the result back.
static SDValue Lower256IntVETCC(SDValue Op, SelectionDAG &DAG) {
EVT VT = Op.getValueType();
assert(VT.getSizeInBits() == 256 && Op.getOpcode() == ISD::VSETCC &&
"Unsupported value type for operation");
int NumElems = VT.getVectorNumElements();
DebugLoc dl = Op.getDebugLoc();
SDValue CC = Op.getOperand(2);
SDValue Idx0 = DAG.getConstant(0, MVT::i32);
SDValue Idx1 = DAG.getConstant(NumElems/2, MVT::i32);
// Extract the LHS vectors
SDValue LHS = Op.getOperand(0);
SDValue LHS1 = Extract128BitVector(LHS, Idx0, DAG, dl);
SDValue LHS2 = Extract128BitVector(LHS, Idx1, DAG, dl);
// Extract the RHS vectors
SDValue RHS = Op.getOperand(1);
SDValue RHS1 = Extract128BitVector(RHS, Idx0, DAG, dl);
SDValue RHS2 = Extract128BitVector(RHS, Idx1, DAG, dl);
// Issue the operation on the smaller types and concatenate the result back
MVT EltVT = VT.getVectorElementType().getSimpleVT();
EVT NewVT = MVT::getVectorVT(EltVT, NumElems/2);
return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT,
DAG.getNode(Op.getOpcode(), dl, NewVT, LHS1, RHS1, CC),
DAG.getNode(Op.getOpcode(), dl, NewVT, LHS2, RHS2, CC));
}
SDValue X86TargetLowering::LowerVSETCC(SDValue Op, SelectionDAG &DAG) const {
SDValue Cond;
SDValue Op0 = Op.getOperand(0);
@ -8181,8 +8214,9 @@ SDValue X86TargetLowering::LowerVSETCC(SDValue Op, SelectionDAG &DAG) const {
return DAG.getNode(Opc, dl, VT, Op0, Op1, DAG.getConstant(SSECC, MVT::i8));
}
// Break 256-bit integer vector compare into smaller ones.
if (!isFP && VT.getSizeInBits() == 256)
return SDValue();
return Lower256IntVETCC(Op, DAG);
// We are handling one of the integer comparisons here. Since SSE only has
// GT and EQ comparisons for integer, swapping operands and multiple

11
llvm/test/CodeGen/X86/avx-cmp.ll
View File

@ -42,3 +42,14 @@ for.end52:
ret void
}
; CHECK: vextractf128 $1
; CHECK: vextractf128 $1
; CHECK-NEXT: vpcmpgtd %xmm
; CHECK-NEXT: vpcmpgtd %xmm
; CHECK-NEXT: vinsertf128 $1
define <8 x i32> @int256-cmp(<8 x i32> %i, <8 x i32> %j) nounwind readnone {
%bincmp = icmp slt <8 x i32> %i, %j
%x = sext <8 x i1> %bincmp to <8 x i32>
ret <8 x i32> %x
}