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InstCombine: Order shufflevector operands by complexity
As shufflevector is effectively commutative we should apply the same logic as other commutative operations where we order the inputs by their `getComplexity()` value. This will put things like `undef`, `poison` and constants on the right hand side where possible. We had a rule moving `undef` to the right hand side that is superseded by this.
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10 files changed

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-102
lines changed

10 files changed

+523
-102
lines changed

‎clang/test/CodeGen/X86/avx-shuffle-builtins.c‎

Lines changed: 450 additions & 72 deletions
Large diffs are not rendered by default.

‎clang/test/CodeGen/X86/sse.c‎

Lines changed: 5 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -1,19 +1,18 @@
1-
// RUN: %clang_cc1 -ffreestanding -O3 -triple x86_64-apple-macosx10.8.0 -target-feature +sse4.1 -emit-llvm %s -o - | FileCheck %s
2-
// FIXME: This test currently depends on optimization - it should be rewritten to avoid it.
1+
// RUN: %clang_cc1 -ffreestanding -triple x86_64-apple-macosx10.8.0 -target-feature +sse4.1 -emit-llvm %s -o - | FileCheck %s
32

43

54
#include <emmintrin.h>
65

76
// Byte-shifts look reversed due to xmm register layout
87
__m128i test_mm_slli_si128(__m128i a) {
98
// CHECK-LABEL: @test_mm_slli_si128
10-
// CHECK: shufflevector <16 x i8> <{{.*}}, i8 0, i8 0, i8 0, i8 0, i8 0>, <16 x i8> {{.*}}, <16 x i32> <i32 11, i32 12, i32 13, i32 14, i32 15, i32 16, i32 17, i32 18, i32 19, i32 20, i32 21, i32 22, i32 23, i32 24, i32 25, i32 26>
9+
// CHECK: shufflevector <16 x i8> zeroinitializer, <16 x i8>{{.*}}, <16 x i32> <i32 11, i32 12, i32 13, i32 14, i32 15, i32 16, i32 17, i32 18, i32 19, i32 20, i32 21, i32 22, i32 23, i32 24, i32 25, i32 26>
1110
return _mm_slli_si128(a, 5);
1211
}
1312

1413
__m128i test_mm_slli_si128_0(__m128i a) {
1514
// CHECK-LABEL: @test_mm_slli_si128_0
16-
// CHECK-NOT: shufflevector
15+
// CHECK: shufflevector <16 x i8> zeroinitializer, <16 x i8> {{.*}}, <16 x i32> <i32 16, i32 17, i32 18, i32 19, i32 20, i32 21, i32 22, i32 23, i32 24, i32 25, i32 26, i32 27, i32 28, i32 29, i32 30, i32 31>
1716
return _mm_slli_si128(a, 0);
1817
}
1918

@@ -25,13 +24,13 @@ __m128i test_mm_slli_si128_16(__m128i a) {
2524

2625
__m128i test_mm_srli_si128(__m128i a) {
2726
// CHECK-LABEL: @test_mm_srli_si128
28-
// CHECK: shufflevector <16 x i8> {{.*}}, <16 x i8> <i8 0, i8 0, i8 0, i8 0, i8 0, {{.*}}>, <16 x i32> <i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15, i32 16, i32 17, i32 18, i32 19, i32 20>
27+
// CHECK: shufflevector <16 x i8> {{.*}}, <16 x i8> zeroinitializer, <16 x i32> <i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15, i32 16, i32 17, i32 18, i32 19, i32 20>
2928
return _mm_srli_si128(a, 5);
3029
}
3130

3231
__m128i test_mm_srli_si128_0(__m128i a) {
3332
// CHECK-LABEL: @test_mm_srli_si128_0
34-
// CHECK-NOT: shufflevector
33+
// CHECK: shufflevector <16 x i8> {{.*}}, <16 x i8> zeroinitializer, <16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15>
3534
return _mm_srli_si128(a, 0);
3635
}
3736

‎llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp‎

Lines changed: 18 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -2248,13 +2248,15 @@ Instruction *InstCombinerImpl::foldSelectShuffle(ShuffleVectorInst &Shuf) {
22482248
if (!Shuf.isSelect())
22492249
return nullptr;
22502250

2251+
Value *Op0 = Shuf.getOperand(0);
2252+
Value *Op1 = Shuf.getOperand(1);
2253+
22512254
// Canonicalize to choose from operand 0 first unless operand 1 is undefined.
2252-
// Commuting undef to operand 0 conflicts with another canonicalization.
2255+
// Only do so when the operand have the same complexity to avoid conflict with
2256+
// complexity normalization.
22532257
unsigned NumElts = cast<FixedVectorType>(Shuf.getType())->getNumElements();
2254-
if (!match(Shuf.getOperand(1), m_Undef()) &&
2255-
Shuf.getMaskValue(0) >= (int)NumElts) {
2256-
// TODO: Can we assert that both operands of a shuffle-select are not undef
2257-
// (otherwise, it would have been folded by instsimplify?
2258+
if (Shuf.getMaskValue(0) >= (int)NumElts &&
2259+
getComplexity(Op0) == getComplexity(Op1)) {
22582260
Shuf.commute();
22592261
return &Shuf;
22602262
}
@@ -2267,8 +2269,7 @@ Instruction *InstCombinerImpl::foldSelectShuffle(ShuffleVectorInst &Shuf) {
22672269
return I;
22682270

22692271
BinaryOperator *B0, *B1;
2270-
if (!match(Shuf.getOperand(0), m_BinOp(B0)) ||
2271-
!match(Shuf.getOperand(1), m_BinOp(B1)))
2272+
if (!match(Op0, m_BinOp(B0)) || !match(Op1, m_BinOp(B1)))
22722273
return nullptr;
22732274

22742275
// If one operand is "0 - X", allow that to be viewed as "X * -1"
@@ -2791,6 +2792,16 @@ Instruction *InstCombinerImpl::simplifyBinOpSplats(ShuffleVectorInst &SVI) {
27912792
Instruction *InstCombinerImpl::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
27922793
Value *LHS = SVI.getOperand(0);
27932794
Value *RHS = SVI.getOperand(1);
2795+
2796+
unsigned LHSComplexity = getComplexity(LHS);
2797+
unsigned RHSComplexity = getComplexity(RHS);
2798+
// Order operands from most complex to least complex so for example
2799+
// constants or poison end up on RHS.
2800+
if (LHSComplexity < RHSComplexity) {
2801+
SVI.commute();
2802+
return &SVI;
2803+
}
2804+
27942805
SimplifyQuery ShufQuery = SQ.getWithInstruction(&SVI);
27952806
if (auto *V = simplifyShuffleVectorInst(LHS, RHS, SVI.getShuffleMask(),
27962807
SVI.getType(), ShufQuery))
@@ -2858,12 +2869,6 @@ Instruction *InstCombinerImpl::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
28582869
return new ShuffleVectorInst(LHS, createUnaryMask(Mask, LHSWidth));
28592870
}
28602871

2861-
// shuffle undef, x, mask --> shuffle x, undef, mask'
2862-
if (match(LHS, m_Undef())) {
2863-
SVI.commute();
2864-
return &SVI;
2865-
}
2866-
28672872
if (Instruction *I = canonicalizeInsertSplat(SVI, Builder))
28682873
return I;
28692874

‎llvm/test/Analysis/ValueTracking/knownbits-x86-hadd-hsub.ll‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -240,7 +240,7 @@ define <4 x i1> @hadd_shuffle_4th_negative_v4i32(<4 x i32> %x, <4 x i32> %y) {
240240
; CHECK-NEXT: [[TMP0:%.*]] = and <4 x i32> [[X]], <i32 3, i32 3, i32 3, i32 3>
241241
; CHECK-NEXT: [[TMP1:%.*]] = and <4 x i32> [[Y]], <i32 3, i32 3, i32 -1, i32 -1>
242242
; CHECK-NEXT: [[TMP2:%.*]] = tail call <4 x i32> @llvm.x86.ssse3.phadd.d.128(<4 x i32> [[TMP0]], <4 x i32> [[TMP1]])
243-
; CHECK-NEXT: [[TMP3:%.*]] = shufflevector <4 x i32> <i32 0, i32 0, i32 0, i32 poison>, <4 x i32> [[TMP2]], <4 x i32> <i32 0, i32 1, i32 2, i32 7>
243+
; CHECK-NEXT: [[TMP3:%.*]] = shufflevector <4 x i32> [[TMP2]], <4 x i32> <i32 0, i32 0, i32 0, i32 poison>, <4 x i32> <i32 4, i32 5, i32 6, i32 3>
244244
; CHECK-NEXT: [[RET:%.*]] = icmp ne <4 x i32> [[TMP3]], <i32 8, i32 8, i32 8, i32 8>
245245
; CHECK-NEXT: ret <4 x i1> [[RET]]
246246
;

‎llvm/test/Transforms/InstCombine/insert-extract-shuffle-inseltpoison.ll‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -87,7 +87,7 @@ define <8 x float> @widen_extract4(<8 x float> %ins, <2 x float> %ext) {
8787
define <8 x i16> @pr26015(<4 x i16> %t0) {
8888
; CHECK-LABEL: @pr26015(
8989
; CHECK-NEXT: [[TMP1:%.*]] = shufflevector <4 x i16> [[T0:%.*]], <4 x i16> poison, <8 x i32> <i32 poison, i32 poison, i32 2, i32 3, i32 poison, i32 poison, i32 poison, i32 poison>
90-
; CHECK-NEXT: [[T5:%.*]] = shufflevector <8 x i16> <i16 0, i16 0, i16 0, i16 poison, i16 0, i16 0, i16 0, i16 poison>, <8 x i16> [[TMP1]], <8 x i32> <i32 0, i32 1, i32 2, i32 10, i32 4, i32 5, i32 6, i32 11>
90+
; CHECK-NEXT: [[T5:%.*]] = shufflevector <8 x i16> [[TMP1]], <8 x i16> <i16 0, i16 0, i16 0, i16 poison, i16 0, i16 0, i16 0, i16 poison>, <8 x i32> <i32 8, i32 9, i32 10, i32 2, i32 12, i32 13, i32 14, i32 3>
9191
; CHECK-NEXT: ret <8 x i16> [[T5]]
9292
;
9393
%t1 = extractelement <4 x i16> %t0, i32 2
@@ -267,7 +267,7 @@ define <4 x i32> @extractelt_insertion(<2 x i32> %x, i32 %y) {
267267
; CHECK-LABEL: @extractelt_insertion(
268268
; CHECK-NEXT: entry:
269269
; CHECK-NEXT: [[TMP0:%.*]] = shufflevector <2 x i32> [[X:%.*]], <2 x i32> poison, <4 x i32> <i32 0, i32 1, i32 poison, i32 poison>
270-
; CHECK-NEXT: [[B:%.*]] = shufflevector <4 x i32> <i32 0, i32 poison, i32 poison, i32 poison>, <4 x i32> [[TMP0]], <4 x i32> <i32 0, i32 0, i32 0, i32 5>
270+
; CHECK-NEXT: [[B:%.*]] = shufflevector <4 x i32> [[TMP0]], <4 x i32> <i32 0, i32 poison, i32 poison, i32 poison>, <4 x i32> <i32 4, i32 4, i32 4, i32 1>
271271
; CHECK-NEXT: [[C:%.*]] = add i32 [[Y:%.*]], 3
272272
; CHECK-NEXT: [[D:%.*]] = extractelement <4 x i32> [[TMP0]], i32 [[C]]
273273
; CHECK-NEXT: [[E:%.*]] = icmp eq i32 [[D]], 0

‎llvm/test/Transforms/InstCombine/insert-extract-shuffle.ll‎

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -87,7 +87,7 @@ define <8 x float> @widen_extract4(<8 x float> %ins, <2 x float> %ext) {
8787
define <8 x i16> @pr26015(<4 x i16> %t0) {
8888
; CHECK-LABEL: @pr26015(
8989
; CHECK-NEXT: [[TMP1:%.*]] = shufflevector <4 x i16> [[T0:%.*]], <4 x i16> poison, <8 x i32> <i32 poison, i32 poison, i32 2, i32 3, i32 poison, i32 poison, i32 poison, i32 poison>
90-
; CHECK-NEXT: [[T5:%.*]] = shufflevector <8 x i16> <i16 0, i16 0, i16 0, i16 poison, i16 0, i16 0, i16 0, i16 poison>, <8 x i16> [[TMP1]], <8 x i32> <i32 0, i32 1, i32 2, i32 10, i32 4, i32 5, i32 6, i32 11>
90+
; CHECK-NEXT: [[T5:%.*]] = shufflevector <8 x i16> [[TMP1]], <8 x i16> <i16 0, i16 0, i16 0, i16 poison, i16 0, i16 0, i16 0, i16 poison>, <8 x i32> <i32 8, i32 9, i32 10, i32 2, i32 12, i32 13, i32 14, i32 3>
9191
; CHECK-NEXT: ret <8 x i16> [[T5]]
9292
;
9393
%t1 = extractelement <4 x i16> %t0, i32 2
@@ -267,7 +267,7 @@ define <4 x i32> @extractelt_insertion(<2 x i32> %x, i32 %y) {
267267
; CHECK-LABEL: @extractelt_insertion(
268268
; CHECK-NEXT: entry:
269269
; CHECK-NEXT: [[TMP0:%.*]] = shufflevector <2 x i32> [[X:%.*]], <2 x i32> poison, <4 x i32> <i32 0, i32 1, i32 poison, i32 poison>
270-
; CHECK-NEXT: [[B:%.*]] = shufflevector <4 x i32> <i32 0, i32 poison, i32 poison, i32 poison>, <4 x i32> [[TMP0]], <4 x i32> <i32 0, i32 0, i32 0, i32 5>
270+
; CHECK-NEXT: [[B:%.*]] = shufflevector <4 x i32> [[TMP0]], <4 x i32> <i32 0, i32 poison, i32 poison, i32 poison>, <4 x i32> <i32 4, i32 4, i32 4, i32 1>
271271
; CHECK-NEXT: [[C:%.*]] = add i32 [[Y:%.*]], 3
272272
; CHECK-NEXT: [[D:%.*]] = extractelement <4 x i32> [[TMP0]], i32 [[C]]
273273
; CHECK-NEXT: [[E:%.*]] = icmp eq i32 [[D]], 0
@@ -795,7 +795,7 @@ define <4 x i32> @infloop_D151807(<4 x float> %arg) {
795795
; CHECK-NEXT: [[I:%.*]] = shufflevector <4 x float> [[ARG:%.*]], <4 x float> poison, <2 x i32> <i32 2, i32 poison>
796796
; CHECK-NEXT: [[I1:%.*]] = bitcast <2 x float> [[I]] to <2 x i32>
797797
; CHECK-NEXT: [[TMP1:%.*]] = shufflevector <2 x i32> [[I1]], <2 x i32> poison, <4 x i32> <i32 0, i32 poison, i32 poison, i32 poison>
798-
; CHECK-NEXT: [[I4:%.*]] = shufflevector <4 x i32> <i32 0, i32 poison, i32 poison, i32 poison>, <4 x i32> [[TMP1]], <4 x i32> <i32 4, i32 0, i32 0, i32 0>
798+
; CHECK-NEXT: [[I4:%.*]] = shufflevector <4 x i32> [[TMP1]], <4 x i32> <i32 0, i32 poison, i32 poison, i32 poison>, <4 x i32> <i32 0, i32 4, i32 4, i32 4>
799799
; CHECK-NEXT: ret <4 x i32> [[I4]]
800800
;
801801
%i = shufflevector <4 x float> %arg, <4 x float> poison, <2 x i32> <i32 2, i32 poison>

‎llvm/test/Transforms/InstCombine/vec_shuffle-inseltpoison.ll‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1346,7 +1346,7 @@ define <2 x float> @frem_splat_constant1(<2 x float> %x) {
13461346

13471347
define <2 x i1> @PR40734(<1 x i1> %x, <4 x i1> %y) {
13481348
; CHECK-LABEL: @PR40734(
1349-
; CHECK-NEXT: [[WIDEN:%.*]] = shufflevector <1 x i1> zeroinitializer, <1 x i1> [[X:%.*]], <2 x i32> <i32 0, i32 1>
1349+
; CHECK-NEXT: [[WIDEN:%.*]] = shufflevector <1 x i1> [[X:%.*]], <1 x i1> zeroinitializer, <2 x i32> <i32 1, i32 0>
13501350
; CHECK-NEXT: [[NARROW:%.*]] = shufflevector <4 x i1> [[Y:%.*]], <4 x i1> poison, <2 x i32> <i32 0, i32 1>
13511351
; CHECK-NEXT: [[R:%.*]] = and <2 x i1> [[WIDEN]], [[NARROW]]
13521352
; CHECK-NEXT: ret <2 x i1> [[R]]

‎llvm/test/Transforms/InstCombine/vec_shuffle.ll‎

Lines changed: 41 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1351,7 +1351,7 @@ define <2 x float> @frem_splat_constant1(<2 x float> %x) {
13511351

13521352
define <2 x i1> @PR40734(<1 x i1> %x, <4 x i1> %y) {
13531353
; CHECK-LABEL: @PR40734(
1354-
; CHECK-NEXT: [[WIDEN:%.*]] = shufflevector <1 x i1> zeroinitializer, <1 x i1> [[X:%.*]], <2 x i32> <i32 0, i32 1>
1354+
; CHECK-NEXT: [[WIDEN:%.*]] = shufflevector <1 x i1> [[X:%.*]], <1 x i1> zeroinitializer, <2 x i32> <i32 1, i32 0>
13551355
; CHECK-NEXT: [[NARROW:%.*]] = shufflevector <4 x i1> [[Y:%.*]], <4 x i1> poison, <2 x i32> <i32 0, i32 1>
13561356
; CHECK-NEXT: [[R:%.*]] = and <2 x i1> [[WIDEN]], [[NARROW]]
13571357
; CHECK-NEXT: ret <2 x i1> [[R]]
@@ -2335,7 +2335,7 @@ define <2 x float> @uitofp_shuf_narrow(<4 x i32> %x, <4 x i32> %y) {
23352335
define <4 x i16> @blend_elements_from_load(ptr align 8 %_0) {
23362336
; CHECK-LABEL: @blend_elements_from_load(
23372337
; CHECK-NEXT: [[LOAD:%.*]] = load <3 x i16>, ptr [[_0:%.*]], align 8
2338-
; CHECK-NEXT: [[RV:%.*]] = shufflevector <3 x i16> <i16 0, i16 undef, i16 poison>, <3 x i16> [[LOAD]], <4 x i32> <i32 0, i32 1, i32 3, i32 5>
2338+
; CHECK-NEXT: [[RV:%.*]] = shufflevector <3 x i16> [[LOAD]], <3 x i16> <i16 0, i16 undef, i16 poison>, <4 x i32> <i32 3, i32 4, i32 0, i32 2>
23392339
; CHECK-NEXT: ret <4 x i16> [[RV]]
23402340
;
23412341
%load = load <3 x i16>, ptr %_0, align 8
@@ -2377,3 +2377,42 @@ define <2 x i32> @not_splat_shuffle2(i32 %x) {
23772377
%shuf = shufflevector <2 x i32> %vec, <2 x i32> undef, <2 x i32> <i32 1, i32 3>
23782378
ret <2 x i32> %shuf
23792379
}
2380+
2381+
define <2 x i32> @commutative0(<2 x i32> %x) {
2382+
; CHECK-LABEL: @commutative0(
2383+
; CHECK-NEXT: [[SHUF:%.*]] = shufflevector <2 x i32> [[X:%.*]], <2 x i32> poison, <2 x i32> <i32 poison, i32 1>
2384+
; CHECK-NEXT: ret <2 x i32> [[SHUF]]
2385+
;
2386+
%shuf = shufflevector <2 x i32> poison, <2 x i32> %x, <2 x i32> <i32 0, i32 3>
2387+
ret <2 x i32> %shuf
2388+
}
2389+
2390+
define <2 x i32> @commutative1(<2 x i32> %x) {
2391+
; CHECK-LABEL: @commutative1(
2392+
; CHECK-NEXT: [[SHUF1:%.*]] = insertelement <2 x i32> [[X:%.*]], i32 undef, i64 0
2393+
; CHECK-NEXT: ret <2 x i32> [[SHUF1]]
2394+
;
2395+
%shuf = shufflevector <2 x i32> undef, <2 x i32> %x, <2 x i32> <i32 0, i32 3>
2396+
ret <2 x i32> %shuf
2397+
}
2398+
2399+
define <4 x i32> @commutative2(<4 x i32> %x) {
2400+
; CHECK-LABEL: @commutative2(
2401+
; CHECK-NEXT: [[SHUF:%.*]] = shufflevector <4 x i32> [[X:%.*]], <4 x i32> <i32 7, i32 poison, i32 -1, i32 poison>, <4 x i32> <i32 4, i32 1, i32 6, i32 3>
2402+
; CHECK-NEXT: ret <4 x i32> [[SHUF]]
2403+
;
2404+
%shuf = shufflevector <4 x i32> <i32 7, i32 42, i32 -1, i32 3>, <4 x i32> %x, <4 x i32> <i32 0, i32 5, i32 2, i32 7>
2405+
ret <4 x i32> %shuf
2406+
}
2407+
2408+
define <2 x i32> @commutative3(<2 x i32> %x, <2 x i16> %y) {
2409+
; CHECK-LABEL: @commutative3(
2410+
; CHECK-NEXT: [[ZX:%.*]] = zext <2 x i16> [[Y:%.*]] to <2 x i32>
2411+
; CHECK-NEXT: [[SHUF:%.*]] = shufflevector <2 x i32> [[X:%.*]], <2 x i32> [[ZX]], <2 x i32> <i32 2, i32 1>
2412+
; CHECK-NEXT: ret <2 x i32> [[SHUF]]
2413+
;
2414+
2415+
%zx = zext <2 x i16> %y to <2 x i32>
2416+
%shuf = shufflevector <2 x i32> %zx, <2 x i32> %x, <2 x i32> <i32 0, i32 3>
2417+
ret <2 x i32> %shuf
2418+
}

‎llvm/test/Transforms/SLPVectorizer/X86/alternate-cast-inseltpoison.ll‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -78,7 +78,7 @@ define <8 x float> @fneg_fabs(<8 x float> %a) {
7878
; CHECK-LABEL: @fneg_fabs(
7979
; CHECK-NEXT: [[TMP1:%.*]] = fneg <8 x float> [[A:%.*]]
8080
; CHECK-NEXT: [[TMP2:%.*]] = call <8 x float> @llvm.fabs.v8f32(<8 x float> [[A]])
81-
; CHECK-NEXT: [[DOTUNCASTED:%.*]] = shufflevector <8 x float> [[TMP1]], <8 x float> [[TMP2]], <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 12, i32 13, i32 14, i32 15>
81+
; CHECK-NEXT: [[DOTUNCASTED:%.*]] = shufflevector <8 x float> [[TMP2]], <8 x float> [[TMP1]], <8 x i32> <i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7>
8282
; CHECK-NEXT: ret <8 x float> [[DOTUNCASTED]]
8383
;
8484
%a0 = extractelement <8 x float> %a, i32 0

‎llvm/test/Transforms/SLPVectorizer/X86/alternate-cast.ll‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -78,7 +78,7 @@ define <8 x float> @fneg_fabs(<8 x float> %a) {
7878
; CHECK-LABEL: @fneg_fabs(
7979
; CHECK-NEXT: [[TMP1:%.*]] = fneg <8 x float> [[A:%.*]]
8080
; CHECK-NEXT: [[TMP2:%.*]] = call <8 x float> @llvm.fabs.v8f32(<8 x float> [[A]])
81-
; CHECK-NEXT: [[DOTUNCASTED:%.*]] = shufflevector <8 x float> [[TMP1]], <8 x float> [[TMP2]], <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 12, i32 13, i32 14, i32 15>
81+
; CHECK-NEXT: [[DOTUNCASTED:%.*]] = shufflevector <8 x float> [[TMP2]], <8 x float> [[TMP1]], <8 x i32> <i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7>
8282
; CHECK-NEXT: ret <8 x float> [[DOTUNCASTED]]
8383
;
8484
%a0 = extractelement <8 x float> %a, i32 0

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