1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt < %s -instcombine -S | FileCheck %s
4 declare void @use(<4 x i16>)
6 define void @test(<16 x i8> %w, i32* %o1, float* %o2) {
8 ; CHECK-NEXT: [[V_BC:%.*]] = bitcast <16 x i8> [[W:%.*]] to <4 x i32>
9 ; CHECK-NEXT: [[V_EXTRACT:%.*]] = extractelement <4 x i32> [[V_BC]], i32 3
10 ; CHECK-NEXT: [[V_BC1:%.*]] = bitcast <16 x i8> [[W]] to <4 x float>
11 ; CHECK-NEXT: [[V_EXTRACT2:%.*]] = extractelement <4 x float> [[V_BC1]], i32 3
12 ; CHECK-NEXT: store i32 [[V_EXTRACT]], i32* [[O1:%.*]], align 4
13 ; CHECK-NEXT: store float [[V_EXTRACT2]], float* [[O2:%.*]], align 4
14 ; CHECK-NEXT: ret void
16 %v = shufflevector <16 x i8> %w, <16 x i8> undef, <4 x i32> <i32 12, i32 13, i32 14, i32 15>
17 %f = bitcast <4 x i8> %v to float
18 %i = bitcast <4 x i8> %v to i32
19 store i32 %i, i32* %o1, align 4
20 store float %f, float* %o2, align 4
24 ; Shuffle-of-bitcast-splat --> splat-bitcast
26 define <4 x i16> @splat_bitcast_operand(<8 x i8> %x) {
27 ; CHECK-LABEL: @splat_bitcast_operand(
28 ; CHECK-NEXT: [[S1:%.*]] = shufflevector <8 x i8> [[X:%.*]], <8 x i8> undef, <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
29 ; CHECK-NEXT: [[S2:%.*]] = bitcast <8 x i8> [[S1]] to <4 x i16>
30 ; CHECK-NEXT: ret <4 x i16> [[S2]]
32 %s1 = shufflevector <8 x i8> %x, <8 x i8> undef, <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
33 %bc = bitcast <8 x i8> %s1 to <4 x i16>
34 %s2 = shufflevector <4 x i16> %bc, <4 x i16> undef, <4 x i32> <i32 0, i32 2, i32 1, i32 0>
38 ; Shuffle-of-bitcast-splat --> splat-bitcast
40 define <4 x i16> @splat_bitcast_operand_uses(<8 x i8> %x) {
41 ; CHECK-LABEL: @splat_bitcast_operand_uses(
42 ; CHECK-NEXT: [[S1:%.*]] = shufflevector <8 x i8> [[X:%.*]], <8 x i8> undef, <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
43 ; CHECK-NEXT: [[BC:%.*]] = bitcast <8 x i8> [[S1]] to <4 x i16>
44 ; CHECK-NEXT: call void @use(<4 x i16> [[BC]])
45 ; CHECK-NEXT: [[S2:%.*]] = bitcast <8 x i8> [[S1]] to <4 x i16>
46 ; CHECK-NEXT: ret <4 x i16> [[S2]]
48 %s1 = shufflevector <8 x i8> %x, <8 x i8> undef, <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
49 %bc = bitcast <8 x i8> %s1 to <4 x i16>
50 call void @use(<4 x i16> %bc)
51 %s2 = shufflevector <4 x i16> %bc, <4 x i16> undef, <4 x i32> <i32 0, i32 2, i32 1, i32 0>
55 ; Shuffle-of-bitcast-splat --> splat-bitcast
57 define <4 x i32> @splat_bitcast_operand_same_size_src_elt(<4 x float> %x) {
58 ; CHECK-LABEL: @splat_bitcast_operand_same_size_src_elt(
59 ; CHECK-NEXT: [[TMP1:%.*]] = bitcast <4 x float> [[X:%.*]] to <4 x i32>
60 ; CHECK-NEXT: [[BC:%.*]] = shufflevector <4 x i32> [[TMP1]], <4 x i32> undef, <4 x i32> <i32 2, i32 2, i32 2, i32 2>
61 ; CHECK-NEXT: ret <4 x i32> [[BC]]
63 %s1 = shufflevector <4 x float> %x, <4 x float> undef, <4 x i32> <i32 2, i32 2, i32 2, i32 2>
64 %bc = bitcast <4 x float> %s1 to <4 x i32>
65 %s2 = shufflevector <4 x i32> %bc, <4 x i32> undef, <4 x i32> <i32 0, i32 2, i32 1, i32 0>
69 ; Scaled mask is inverse of first mask.
71 define <4 x i32> @shuf_bitcast_operand(<16 x i8> %x) {
72 ; CHECK-LABEL: @shuf_bitcast_operand(
73 ; CHECK-NEXT: [[S2:%.*]] = bitcast <16 x i8> [[X:%.*]] to <4 x i32>
74 ; CHECK-NEXT: ret <4 x i32> [[S2]]
76 %s1 = shufflevector <16 x i8> %x, <16 x i8> undef, <16 x i32> <i32 12, i32 13, i32 14, i32 15, i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7, i32 0, i32 1, i32 2, i32 3>
77 %bc = bitcast <16 x i8> %s1 to <4 x i32>
78 %s2 = shufflevector <4 x i32> %bc, <4 x i32> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
82 ; TODO: Could allow fold for length-changing shuffles.
84 define <5 x i16> @splat_bitcast_operand_change_type(<8 x i8> %x) {
85 ; CHECK-LABEL: @splat_bitcast_operand_change_type(
86 ; CHECK-NEXT: [[S1:%.*]] = shufflevector <8 x i8> [[X:%.*]], <8 x i8> undef, <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
87 ; CHECK-NEXT: [[BC:%.*]] = bitcast <8 x i8> [[S1]] to <4 x i16>
88 ; CHECK-NEXT: [[S2:%.*]] = shufflevector <4 x i16> [[BC]], <4 x i16> undef, <5 x i32> <i32 0, i32 2, i32 1, i32 0, i32 3>
89 ; CHECK-NEXT: ret <5 x i16> [[S2]]
91 %s1 = shufflevector <8 x i8> %x, <8 x i8> undef, <8 x i32> <i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1, i32 1>
92 %bc = bitcast <8 x i8> %s1 to <4 x i16>
93 %s2 = shufflevector <4 x i16> %bc, <4 x i16> undef, <5 x i32> <i32 0, i32 2, i32 1, i32 0, i32 3>
97 ; Shuffle-of-bitcast-splat --> splat-bitcast
99 define <4 x i16> @splat_bitcast_operand_wider_src_elt(<2 x i32> %x) {
100 ; CHECK-LABEL: @splat_bitcast_operand_wider_src_elt(
101 ; CHECK-NEXT: [[S1:%.*]] = shufflevector <2 x i32> [[X:%.*]], <2 x i32> undef, <2 x i32> <i32 1, i32 1>
102 ; CHECK-NEXT: [[S2:%.*]] = bitcast <2 x i32> [[S1]] to <4 x i16>
103 ; CHECK-NEXT: ret <4 x i16> [[S2]]
105 %s1 = shufflevector <2 x i32> %x, <2 x i32> undef, <2 x i32> <i32 1, i32 1>
106 %bc = bitcast <2 x i32> %s1 to <4 x i16>
107 %s2 = shufflevector <4 x i16> %bc, <4 x i16> undef, <4 x i32> <i32 0, i32 1, i32 0, i32 1>
111 ; Shuffle-of-bitcast-splat --> splat-bitcast
113 define <4 x i16> @splat_bitcast_operand_wider_src_elt_uses(<2 x i32> %x) {
114 ; CHECK-LABEL: @splat_bitcast_operand_wider_src_elt_uses(
115 ; CHECK-NEXT: [[S1:%.*]] = shufflevector <2 x i32> [[X:%.*]], <2 x i32> undef, <2 x i32> <i32 1, i32 1>
116 ; CHECK-NEXT: [[BC:%.*]] = bitcast <2 x i32> [[S1]] to <4 x i16>
117 ; CHECK-NEXT: call void @use(<4 x i16> [[BC]])
118 ; CHECK-NEXT: [[S2:%.*]] = bitcast <2 x i32> [[S1]] to <4 x i16>
119 ; CHECK-NEXT: ret <4 x i16> [[S2]]
121 %s1 = shufflevector <2 x i32> %x, <2 x i32> undef, <2 x i32> <i32 1, i32 1>
122 %bc = bitcast <2 x i32> %s1 to <4 x i16>
123 call void @use(<4 x i16> %bc)
124 %s2 = shufflevector <4 x i16> %bc, <4 x i16> undef, <4 x i32> <i32 0, i32 1, i32 0, i32 1>
128 ; Scaled mask is inverse of first mask.
130 define <16 x i8> @shuf_bitcast_operand_wider_src(<4 x i32> %x) {
131 ; CHECK-LABEL: @shuf_bitcast_operand_wider_src(
132 ; CHECK-NEXT: [[S2:%.*]] = bitcast <4 x i32> [[X:%.*]] to <16 x i8>
133 ; CHECK-NEXT: ret <16 x i8> [[S2]]
135 %s1 = shufflevector <4 x i32> %x, <4 x i32> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
136 %bc = bitcast <4 x i32> %s1 to <16 x i8>
137 %s2 = shufflevector <16 x i8> %bc, <16 x i8> undef, <16 x i32> <i32 12, i32 13, i32 14, i32 15, i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7, i32 0, i32 1, i32 2, i32 3>
141 ; Negative test - the 2nd mask can't be widened
143 define <16 x i8> @shuf_bitcast_operand_cannot_widen(<4 x i32> %x) {
144 ; CHECK-LABEL: @shuf_bitcast_operand_cannot_widen(
145 ; CHECK-NEXT: [[S1:%.*]] = shufflevector <4 x i32> [[X:%.*]], <4 x i32> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
146 ; CHECK-NEXT: [[BC:%.*]] = bitcast <4 x i32> [[S1]] to <16 x i8>
147 ; CHECK-NEXT: [[S2:%.*]] = shufflevector <16 x i8> [[BC]], <16 x i8> undef, <16 x i32> <i32 12, i32 13, i32 12, i32 13, i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7, i32 0, i32 1, i32 2, i32 3>
148 ; CHECK-NEXT: ret <16 x i8> [[S2]]
150 %s1 = shufflevector <4 x i32> %x, <4 x i32> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
151 %bc = bitcast <4 x i32> %s1 to <16 x i8>
152 %s2 = shufflevector <16 x i8> %bc, <16 x i8> undef, <16 x i32> <i32 12, i32 13, i32 12, i32 13, i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7, i32 0, i32 1, i32 2, i32 3>
156 ; Negative test - the 2nd mask can't be widened
158 define <16 x i8> @shuf_bitcast_operand_cannot_widen_undef(<4 x i32> %x) {
159 ; CHECK-LABEL: @shuf_bitcast_operand_cannot_widen_undef(
160 ; CHECK-NEXT: [[S1:%.*]] = shufflevector <4 x i32> [[X:%.*]], <4 x i32> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
161 ; CHECK-NEXT: [[BC:%.*]] = bitcast <4 x i32> [[S1]] to <16 x i8>
162 ; CHECK-NEXT: [[S2:%.*]] = shufflevector <16 x i8> [[BC]], <16 x i8> undef, <16 x i32> <i32 12, i32 undef, i32 14, i32 15, i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7, i32 0, i32 1, i32 2, i32 3>
163 ; CHECK-NEXT: ret <16 x i8> [[S2]]
165 %s1 = shufflevector <4 x i32> %x, <4 x i32> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
166 %bc = bitcast <4 x i32> %s1 to <16 x i8>
167 %s2 = shufflevector <16 x i8> %bc, <16 x i8> undef, <16 x i32> <i32 12, i32 undef, i32 14, i32 15, i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7, i32 0, i32 1, i32 2, i32 3>
171 define <2 x i4> @shuf_bitcast_insert(<2 x i8> %v, i8 %x) {
172 ; CHECK-LABEL: @shuf_bitcast_insert(
173 ; CHECK-NEXT: [[R:%.*]] = bitcast i8 [[X:%.*]] to <2 x i4>
174 ; CHECK-NEXT: ret <2 x i4> [[R]]
176 %i = insertelement <2 x i8> %v, i8 %x, i32 0
177 %b = bitcast <2 x i8> %i to <4 x i4>
178 %r = shufflevector <4 x i4> %b, <4 x i4> undef, <2 x i32> <i32 0, i32 1>
182 define <2 x i4> @shuf_bitcast_inserti_use1(<2 x i8> %v, i8 %x, <2 x i8>* %p) {
183 ; CHECK-LABEL: @shuf_bitcast_inserti_use1(
184 ; CHECK-NEXT: [[I:%.*]] = insertelement <2 x i8> [[V:%.*]], i8 [[X:%.*]], i32 0
185 ; CHECK-NEXT: store <2 x i8> [[I]], <2 x i8>* [[P:%.*]], align 2
186 ; CHECK-NEXT: [[R:%.*]] = bitcast i8 [[X]] to <2 x i4>
187 ; CHECK-NEXT: ret <2 x i4> [[R]]
189 %i = insertelement <2 x i8> %v, i8 %x, i32 0
190 store <2 x i8> %i, <2 x i8>* %p
191 %b = bitcast <2 x i8> %i to <4 x i4>
192 %r = shufflevector <4 x i4> %b, <4 x i4> undef, <2 x i32> <i32 0, i32 1>
196 define <2 x i4> @shuf_bitcast_insert_use2(<2 x i8> %v, i8 %x, <4 x i4>* %p) {
197 ; CHECK-LABEL: @shuf_bitcast_insert_use2(
198 ; CHECK-NEXT: [[I:%.*]] = insertelement <2 x i8> [[V:%.*]], i8 [[X:%.*]], i32 0
199 ; CHECK-NEXT: [[TMP1:%.*]] = bitcast <4 x i4>* [[P:%.*]] to <2 x i8>*
200 ; CHECK-NEXT: store <2 x i8> [[I]], <2 x i8>* [[TMP1]], align 2
201 ; CHECK-NEXT: [[R:%.*]] = bitcast i8 [[X]] to <2 x i4>
202 ; CHECK-NEXT: ret <2 x i4> [[R]]
204 %i = insertelement <2 x i8> %v, i8 %x, i32 0
205 %b = bitcast <2 x i8> %i to <4 x i4>
206 store <4 x i4> %b, <4 x i4>* %p
207 %r = shufflevector <4 x i4> %b, <4 x i4> undef, <2 x i32> <i32 0, i32 1>
211 ; negative test - but demanded elements reduces this.
213 define <2 x i4> @shuf_bitcast_insert_wrong_index(<2 x i8> %v, i8 %x) {
214 ; CHECK-LABEL: @shuf_bitcast_insert_wrong_index(
215 ; CHECK-NEXT: [[B:%.*]] = bitcast <2 x i8> [[V:%.*]] to <4 x i4>
216 ; CHECK-NEXT: [[R:%.*]] = shufflevector <4 x i4> [[B]], <4 x i4> undef, <2 x i32> <i32 0, i32 1>
217 ; CHECK-NEXT: ret <2 x i4> [[R]]
219 %i = insertelement <2 x i8> %v, i8 %x, i32 1
220 %b = bitcast <2 x i8> %i to <4 x i4>
221 %r = shufflevector <4 x i4> %b, <4 x i4> undef, <2 x i32> <i32 0, i32 1>
227 define <3 x i4> @shuf_bitcast_wrong_size(<2 x i8> %v, i8 %x) {
228 ; CHECK-LABEL: @shuf_bitcast_wrong_size(
229 ; CHECK-NEXT: [[I:%.*]] = insertelement <2 x i8> [[V:%.*]], i8 [[X:%.*]], i32 0
230 ; CHECK-NEXT: [[B:%.*]] = bitcast <2 x i8> [[I]] to <4 x i4>
231 ; CHECK-NEXT: [[R:%.*]] = shufflevector <4 x i4> [[B]], <4 x i4> undef, <3 x i32> <i32 0, i32 1, i32 2>
232 ; CHECK-NEXT: ret <3 x i4> [[R]]
234 %i = insertelement <2 x i8> %v, i8 %x, i32 0
235 %b = bitcast <2 x i8> %i to <4 x i4>
236 %r = shufflevector <4 x i4> %b, <4 x i4> undef, <3 x i32> <i32 0, i32 1, i32 2>