1 ; RUN: opt < %s -instcombine -S | FileCheck %s
3 define <4 x float> @test1(<4 x float> %v1) {
5 ; CHECK: ret <4 x float> %v1
6 %v2 = shufflevector <4 x float> %v1, <4 x float> undef, <4 x i32> <i32 0, i32 1, i32 2, i32 3>
10 define <4 x float> @test2(<4 x float> %v1) {
12 ; CHECK: ret <4 x float> %v1
13 %v2 = shufflevector <4 x float> %v1, <4 x float> %v1, <4 x i32> <i32 0, i32 5, i32 2, i32 7>
17 define float @test3(<4 x float> %A, <4 x float> %B, float %f) {
20 %C = insertelement <4 x float> %A, float %f, i32 0
21 %D = shufflevector <4 x float> %C, <4 x float> %B, <4 x i32> <i32 5, i32 0, i32 2, i32 7>
22 %E = extractelement <4 x float> %D, i32 1
26 define i32 @test4(<4 x i32> %X) {
28 ; CHECK-NEXT: extractelement
30 %tmp152.i53899.i = shufflevector <4 x i32> %X, <4 x i32> undef, <4 x i32> zeroinitializer
31 %tmp34 = extractelement <4 x i32> %tmp152.i53899.i, i32 0
35 define i32 @test5(<4 x i32> %X) {
37 ; CHECK-NEXT: extractelement
39 %tmp152.i53899.i = shufflevector <4 x i32> %X, <4 x i32> undef, <4 x i32> <i32 3, i32 2, i32 undef, i32 undef>
40 %tmp34 = extractelement <4 x i32> %tmp152.i53899.i, i32 0
44 define float @test6(<4 x float> %X) {
46 ; CHECK-NEXT: extractelement
48 %X1 = bitcast <4 x float> %X to <4 x i32>
49 %tmp152.i53899.i = shufflevector <4 x i32> %X1, <4 x i32> undef, <4 x i32> zeroinitializer
50 %tmp152.i53900.i = bitcast <4 x i32> %tmp152.i53899.i to <4 x float>
51 %tmp34 = extractelement <4 x float> %tmp152.i53900.i, i32 0
55 define <4 x float> @test7(<4 x float> %tmp45.i) {
57 ; CHECK-NEXT: ret <4 x float> %tmp45.i
58 %tmp1642.i = shufflevector <4 x float> %tmp45.i, <4 x float> undef, <4 x i32> < i32 0, i32 1, i32 6, i32 7 >
59 ret <4 x float> %tmp1642.i
62 ; This should turn into a single shuffle.
63 define <4 x float> @test8(<4 x float> %tmp, <4 x float> %tmp1) {
65 ; CHECK-NEXT: shufflevector
67 %tmp4 = extractelement <4 x float> %tmp, i32 1
68 %tmp2 = extractelement <4 x float> %tmp, i32 3
69 %tmp1.upgrd.1 = extractelement <4 x float> %tmp1, i32 0
70 %tmp128 = insertelement <4 x float> undef, float %tmp4, i32 0
71 %tmp130 = insertelement <4 x float> %tmp128, float undef, i32 1
72 %tmp132 = insertelement <4 x float> %tmp130, float %tmp2, i32 2
73 %tmp134 = insertelement <4 x float> %tmp132, float %tmp1.upgrd.1, i32 3
74 ret <4 x float> %tmp134
77 ; Test fold of two shuffles where the first shuffle vectors inputs are a
78 ; different length then the second.
79 define <4 x i8> @test9(<16 x i8> %tmp6) nounwind {
81 ; CHECK-NEXT: shufflevector
83 %tmp7 = shufflevector <16 x i8> %tmp6, <16 x i8> undef, <4 x i32> < i32 13, i32 9, i32 4, i32 13 > ; <<4 x i8>> [#uses=1]
84 %tmp9 = shufflevector <4 x i8> %tmp7, <4 x i8> undef, <4 x i32> < i32 3, i32 1, i32 2, i32 0 > ; <<4 x i8>> [#uses=1]
88 ; Same as test9, but make sure that "undef" mask values are not confused with
89 ; mask values of 2*N, where N is the mask length. These shuffles should not
90 ; be folded (because [8,9,4,8] may not be a mask supported by the target).
91 define <4 x i8> @test9a(<16 x i8> %tmp6) nounwind {
93 ; CHECK-NEXT: shufflevector
94 ; CHECK-NEXT: shufflevector
96 %tmp7 = shufflevector <16 x i8> %tmp6, <16 x i8> undef, <4 x i32> < i32 undef, i32 9, i32 4, i32 8 > ; <<4 x i8>> [#uses=1]
97 %tmp9 = shufflevector <4 x i8> %tmp7, <4 x i8> undef, <4 x i32> < i32 3, i32 1, i32 2, i32 0 > ; <<4 x i8>> [#uses=1]
101 ; Test fold of two shuffles where the first shuffle vectors inputs are a
102 ; different length then the second.
103 define <4 x i8> @test9b(<4 x i8> %tmp6, <4 x i8> %tmp7) nounwind {
105 ; CHECK-NEXT: shufflevector
107 %tmp1 = shufflevector <4 x i8> %tmp6, <4 x i8> %tmp7, <8 x i32> <i32 0, i32 1, i32 4, i32 5, i32 4, i32 5, i32 2, i32 3> ; <<4 x i8>> [#uses=1]
108 %tmp9 = shufflevector <8 x i8> %tmp1, <8 x i8> undef, <4 x i32> <i32 0, i32 1, i32 4, i32 5> ; <<4 x i8>> [#uses=1]
112 ; Redundant vector splats should be removed. Radar 8597790.
113 define <4 x i32> @test10(<4 x i32> %tmp5) nounwind {
115 ; CHECK-NEXT: shufflevector
117 %tmp6 = shufflevector <4 x i32> %tmp5, <4 x i32> undef, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef>
118 %tmp7 = shufflevector <4 x i32> %tmp6, <4 x i32> undef, <4 x i32> zeroinitializer
122 ; Test fold of two shuffles where the two shufflevector inputs's op1 are
124 define <8 x i8> @test11(<16 x i8> %tmp6) nounwind {
126 ; CHECK-NEXT: shufflevector <16 x i8> %tmp6, <16 x i8> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
128 %tmp1 = shufflevector <16 x i8> %tmp6, <16 x i8> undef, <4 x i32> <i32 0, i32 1, i32 2, i32 3> ; <<4 x i8>> [#uses=1]
129 %tmp2 = shufflevector <16 x i8> %tmp6, <16 x i8> undef, <4 x i32> <i32 4, i32 5, i32 6, i32 7> ; <<4 x i8>> [#uses=1]
130 %tmp3 = shufflevector <4 x i8> %tmp1, <4 x i8> %tmp2, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7> ; <<8 x i8>> [#uses=1]
134 ; Test fold of two shuffles where the first shufflevector's inputs are
135 ; the same as the second
136 define <8 x i8> @test12(<8 x i8> %tmp6, <8 x i8> %tmp2) nounwind {
138 ; CHECK-NEXT: shufflevector <8 x i8> %tmp6, <8 x i8> %tmp2, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 9, i32 8, i32 11, i32 12>
140 %tmp1 = shufflevector <8 x i8> %tmp6, <8 x i8> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 5, i32 4, i32 undef, i32 7> ; <<8 x i8>> [#uses=1]
141 %tmp3 = shufflevector <8 x i8> %tmp1, <8 x i8> %tmp2, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 9, i32 8, i32 11, i32 12> ; <<8 x i8>> [#uses=1]
145 ; Test fold of two shuffles where the first shufflevector's inputs are
146 ; the same as the second
147 define <8 x i8> @test12a(<8 x i8> %tmp6, <8 x i8> %tmp2) nounwind {
149 ; CHECK-NEXT: shufflevector <8 x i8> %tmp2, <8 x i8> %tmp6, <8 x i32> <i32 0, i32 3, i32 1, i32 4, i32 8, i32 9, i32 10, i32 11>
151 %tmp1 = shufflevector <8 x i8> %tmp6, <8 x i8> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 5, i32 4, i32 undef, i32 7> ; <<8 x i8>> [#uses=1]
152 %tmp3 = shufflevector <8 x i8> %tmp2, <8 x i8> %tmp1, <8 x i32> <i32 0, i32 3, i32 1, i32 4, i32 8, i32 9, i32 10, i32 11> ; <<8 x i8>> [#uses=1]
156 ; We should form a shuffle out of a select with constant condition.
157 define <4 x i16> @test13a(<4 x i16> %lhs, <4 x i16> %rhs) {
159 ; CHECK-NEXT: shufflevector <4 x i16> %lhs, <4 x i16> %rhs, <4 x i32> <i32 0, i32 5, i32 2, i32 7>
161 %A = select <4 x i1> <i1 true, i1 false, i1 true, i1 false>,
162 <4 x i16> %lhs, <4 x i16> %rhs
166 define <4 x i16> @test13b(<4 x i16> %lhs, <4 x i16> %rhs) {
168 ; CHECK-NEXT: ret <4 x i16> %lhs
169 %A = select <4 x i1> <i1 true, i1 undef, i1 true, i1 true>,
170 <4 x i16> %lhs, <4 x i16> %rhs
174 define <4 x i16> @test13c(<4 x i16> %lhs, <4 x i16> %rhs) {
176 ; CHECK-NEXT: shufflevector <4 x i16> %lhs, <4 x i16> %rhs, <4 x i32> <i32 0, i32 undef, i32 2, i32 7>
178 %A = select <4 x i1> <i1 true, i1 undef, i1 true, i1 false>,
179 <4 x i16> %lhs, <4 x i16> %rhs
183 define <4 x i16> @test13d(<4 x i16> %lhs, <4 x i16> %rhs) {
187 %A = select <4 x i1> <i1 true, i1 icmp ugt (<4 x i16>(<4 x i16>, <4 x i16>)* @test13a, <4 x i16>(<4 x i16>, <4 x i16>)* @test13b), i1 true, i1 false>,
188 <4 x i16> %lhs, <4 x i16> %rhs
192 define <4 x i16> @test13e(<4 x i16> %lhs, <4 x i16> %rhs) {
194 ; CHECK-NEXT: ret <4 x i16> %rhs
195 %A = select <4 x i1> <i1 false, i1 false, i1 false, i1 false>,
196 <4 x i16> %lhs, <4 x i16> %rhs