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This patch optimizes shuffle instruction - generates 2 instructions instead of 4.

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Since this specific shuffle is widely used in many workloads we have ~10% performance on them.

shufflevector <8 x float> %A, <8 x float> %B, <8 x i32> <i32 0, i32 8, i32 2, i32 10, i32 4, i32 12, i32 6, i32 14>

vmovaps (%rdx), %ymm0
vshufps $8, %ymm0, %ymm0, %ymm0
vmovaps (%rcx), %ymm1
vshufps $8, %ymm0, %ymm1, %ymm1
vunpcklps       %ymm0, %ymm1, %ymm0

vmovaps (%rcx), %ymm0
vmovsldup       (%rdx), %ymm1
vblendps        $85, %ymm0, %ymm1, %ymm0


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163134 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Elena Demikhovsky 2012-09-04 12:49:02 +00:00
parent 7765492a7a
commit 3251020738
2 changed files with 20 additions and 21 deletions
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29
lib/Target/X86/X86ISelLowering.cpp
View File

@ -3506,25 +3506,26 @@ SDValue Compact8x32ShuffleNode(ShuffleVectorSDNode *SVOp,
if (!isUndefOrEqual(Mask[i], MaskToOptimizeOdd[i]))
MatchOddMask = false;
}
static const int CompactionMaskEven[] = {0, 2, -1, -1, 4, 6, -1, -1};
static const int CompactionMaskOdd [] = {1, 3, -1, -1, 5, 7, -1, -1};
const int *CompactionMask;
if (MatchEvenMask)
CompactionMask = CompactionMaskEven;
else if (MatchOddMask)
CompactionMask = CompactionMaskOdd;
else
if (!MatchEvenMask && !MatchOddMask)
return SDValue();
SDValue UndefNode = DAG.getNode(ISD::UNDEF, dl, VT);
SDValue Op0 = DAG.getVectorShuffle(VT, dl, SVOp->getOperand(0),
UndefNode, CompactionMask);
SDValue Op1 = DAG.getVectorShuffle(VT, dl, SVOp->getOperand(1),
UndefNode, CompactionMask);
static const int UnpackMask[] = {0, 8, 1, 9, 4, 12, 5, 13};
return DAG.getVectorShuffle(VT, dl, Op0, Op1, UnpackMask);
SDValue Op0 = SVOp->getOperand(0);
SDValue Op1 = SVOp->getOperand(1);
if (MatchEvenMask) {
// Shift the second operand right to 32 bits.
static const int ShiftRightMask[] = {-1, 0, -1, 2, -1, 4, -1, 6 };
Op1 = DAG.getVectorShuffle(VT, dl, Op1, UndefNode, ShiftRightMask);
} else {
// Shift the first operand left to 32 bits.
static const int ShiftLeftMask[] = {1, -1, 3, -1, 5, -1, 7, -1 };
Op0 = DAG.getVectorShuffle(VT, dl, Op0, UndefNode, ShiftLeftMask);
}
static const int BlendMask[] = {0, 9, 2, 11, 4, 13, 6, 15};
return DAG.getVectorShuffle(VT, dl, Op0, Op1, BlendMask);
}
/// isUNPCKLMask - Return true if the specified VECTOR_SHUFFLE operand

10
test/CodeGen/X86/avx-shuffle.ll
View File

@ -229,9 +229,8 @@ define <8 x float> @test17(<4 x float> %y) {
}
; CHECK: test18
; CHECK: vshufps
; CHECK: vshufps
; CHECK: vunpcklps
; CHECK: vmovshdup
; CHECK: vblendps
; CHECK: ret
define <8 x float> @test18(<8 x float> %A, <8 x float>%B) nounwind {
%S = shufflevector <8 x float> %A, <8 x float> %B, <8 x i32> <i32 1, i32 9, i32 3, i32 11, i32 5, i32 13, i32 7, i32 15>
@ -239,9 +238,8 @@ define <8 x float> @test18(<8 x float> %A, <8 x float>%B) nounwind {
}
; CHECK: test19
; CHECK: vshufps
; CHECK: vshufps
; CHECK: vunpcklps
; CHECK: vmovsldup
; CHECK: vblendps
; CHECK: ret
define <8 x float> @test19(<8 x float> %A, <8 x float>%B) nounwind {
%S = shufflevector <8 x float> %A, <8 x float> %B, <8 x i32> <i32 0, i32 8, i32 2, i32 10, i32 4, i32 12, i32 6, i32 14>