1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt -S -instcombine < %s | FileCheck %s
4 declare void @v4float_user(<4 x float>) #0
6 define float @extract_one_select(<4 x float> %a, <4 x float> %b, i32 %c) #0 {
7 ; CHECK-LABEL: @extract_one_select(
8 ; CHECK-NEXT: [[CMP_NOT:%.*]] = icmp eq i32 [[C:%.*]], 0
9 ; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP_NOT]], <4 x float> [[B:%.*]], <4 x float> [[A:%.*]]
10 ; CHECK-NEXT: [[EXTRACT:%.*]] = extractelement <4 x float> [[SEL]], i32 2
11 ; CHECK-NEXT: ret float [[EXTRACT]]
13 %cmp = icmp ne i32 %c, 0
14 %sel = select i1 %cmp, <4 x float> %a, <4 x float> %b
15 %extract = extractelement <4 x float> %sel, i32 2
19 ; Multiple extractelements
20 define <2 x float> @extract_two_select(<4 x float> %a, <4 x float> %b, i32 %c) #0 {
21 ; CHECK-LABEL: @extract_two_select(
22 ; CHECK-NEXT: [[CMP_NOT:%.*]] = icmp eq i32 [[C:%.*]], 0
23 ; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP_NOT]], <4 x float> [[B:%.*]], <4 x float> [[A:%.*]]
24 ; CHECK-NEXT: [[BUILD2:%.*]] = shufflevector <4 x float> [[SEL]], <4 x float> undef, <2 x i32> <i32 1, i32 2>
25 ; CHECK-NEXT: ret <2 x float> [[BUILD2]]
27 %cmp = icmp ne i32 %c, 0
28 %sel = select i1 %cmp, <4 x float> %a, <4 x float> %b
29 %extract1 = extractelement <4 x float> %sel, i32 1
30 %extract2 = extractelement <4 x float> %sel, i32 2
31 %build1 = insertelement <2 x float> poison, float %extract1, i32 0
32 %build2 = insertelement <2 x float> %build1, float %extract2, i32 1
33 ret <2 x float> %build2
36 ; Select has an extra non-extractelement user, don't change it
37 define float @extract_one_select_user(<4 x float> %a, <4 x float> %b, i32 %c) #0 {
38 ; CHECK-LABEL: @extract_one_select_user(
39 ; CHECK-NEXT: [[CMP_NOT:%.*]] = icmp eq i32 [[C:%.*]], 0
40 ; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP_NOT]], <4 x float> [[B:%.*]], <4 x float> [[A:%.*]]
41 ; CHECK-NEXT: [[EXTRACT:%.*]] = extractelement <4 x float> [[SEL]], i32 2
42 ; CHECK-NEXT: call void @v4float_user(<4 x float> [[SEL]])
43 ; CHECK-NEXT: ret float [[EXTRACT]]
45 %cmp = icmp ne i32 %c, 0
46 %sel = select i1 %cmp, <4 x float> %a, <4 x float> %b
47 %extract = extractelement <4 x float> %sel, i32 2
48 call void @v4float_user(<4 x float> %sel)
52 define float @extract_one_vselect_user(<4 x float> %a, <4 x float> %b, <4 x i32> %c) #0 {
53 ; CHECK-LABEL: @extract_one_vselect_user(
54 ; CHECK-NEXT: [[CMP_NOT:%.*]] = icmp eq <4 x i32> [[C:%.*]], zeroinitializer
55 ; CHECK-NEXT: [[SEL:%.*]] = select <4 x i1> [[CMP_NOT]], <4 x float> [[B:%.*]], <4 x float> [[A:%.*]]
56 ; CHECK-NEXT: [[EXTRACT:%.*]] = extractelement <4 x float> [[SEL]], i32 2
57 ; CHECK-NEXT: call void @v4float_user(<4 x float> [[SEL]])
58 ; CHECK-NEXT: ret float [[EXTRACT]]
60 %cmp = icmp ne <4 x i32> %c, zeroinitializer
61 %sel = select <4 x i1> %cmp, <4 x float> %a, <4 x float> %b
62 %extract = extractelement <4 x float> %sel, i32 2
63 call void @v4float_user(<4 x float> %sel)
67 ; Do not convert the vector select into a scalar select. That would increase
68 ; the instruction count and potentially obfuscate a vector min/max idiom.
70 define float @extract_one_vselect(<4 x float> %a, <4 x float> %b, <4 x i32> %c) #0 {
71 ; CHECK-LABEL: @extract_one_vselect(
72 ; CHECK-NEXT: [[CMP_NOT:%.*]] = icmp eq <4 x i32> [[C:%.*]], zeroinitializer
73 ; CHECK-NEXT: [[SELECT:%.*]] = select <4 x i1> [[CMP_NOT]], <4 x float> [[B:%.*]], <4 x float> [[A:%.*]]
74 ; CHECK-NEXT: [[EXTRACT:%.*]] = extractelement <4 x float> [[SELECT]], i32 0
75 ; CHECK-NEXT: ret float [[EXTRACT]]
77 %cmp = icmp ne <4 x i32> %c, zeroinitializer
78 %select = select <4 x i1> %cmp, <4 x float> %a, <4 x float> %b
79 %extract = extractelement <4 x float> %select, i32 0
83 ; Multiple extractelements from a vector select
84 define <2 x float> @extract_two_vselect(<4 x float> %a, <4 x float> %b, <4 x i32> %c) #0 {
85 ; CHECK-LABEL: @extract_two_vselect(
86 ; CHECK-NEXT: [[CMP_NOT:%.*]] = icmp eq <4 x i32> [[C:%.*]], zeroinitializer
87 ; CHECK-NEXT: [[SEL:%.*]] = select <4 x i1> [[CMP_NOT]], <4 x float> [[B:%.*]], <4 x float> [[A:%.*]]
88 ; CHECK-NEXT: [[BUILD2:%.*]] = shufflevector <4 x float> [[SEL]], <4 x float> undef, <2 x i32> <i32 1, i32 2>
89 ; CHECK-NEXT: ret <2 x float> [[BUILD2]]
91 %cmp = icmp ne <4 x i32> %c, zeroinitializer
92 %sel = select <4 x i1> %cmp, <4 x float> %a, <4 x float> %b
93 %extract1 = extractelement <4 x float> %sel, i32 1
94 %extract2 = extractelement <4 x float> %sel, i32 2
95 %build1 = insertelement <2 x float> poison, float %extract1, i32 0
96 %build2 = insertelement <2 x float> %build1, float %extract2, i32 1
97 ret <2 x float> %build2
100 ; The vector selects are not decomposed into scalar selects because that would increase
101 ; the instruction count. Extract+insert is converted to non-lane-crossing shuffles.
102 ; Test multiple extractelements
103 define <4 x float> @simple_vector_select(<4 x float> %a, <4 x float> %b, <4 x i32> %c) #0 {
104 ; CHECK-LABEL: @simple_vector_select(
106 ; CHECK-NEXT: [[TMP0:%.*]] = extractelement <4 x i32> [[C:%.*]], i32 0
107 ; CHECK-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i32 [[TMP0]], 0
108 ; CHECK-NEXT: [[A_SINK:%.*]] = select i1 [[TOBOOL_NOT]], <4 x float> [[B:%.*]], <4 x float> [[A:%.*]]
109 ; CHECK-NEXT: [[TMP1:%.*]] = extractelement <4 x i32> [[C]], i32 1
110 ; CHECK-NEXT: [[TOBOOL1_NOT:%.*]] = icmp eq i32 [[TMP1]], 0
111 ; CHECK-NEXT: [[A_SINK1:%.*]] = select i1 [[TOBOOL1_NOT]], <4 x float> [[B]], <4 x float> [[A]]
112 ; CHECK-NEXT: [[TMP2:%.*]] = shufflevector <4 x float> [[A_SINK]], <4 x float> [[A_SINK1]], <4 x i32> <i32 0, i32 5, i32 undef, i32 undef>
113 ; CHECK-NEXT: [[TMP3:%.*]] = extractelement <4 x i32> [[C]], i32 2
114 ; CHECK-NEXT: [[TOBOOL6_NOT:%.*]] = icmp eq i32 [[TMP3]], 0
115 ; CHECK-NEXT: [[A_SINK2:%.*]] = select i1 [[TOBOOL6_NOT]], <4 x float> [[B]], <4 x float> [[A]]
116 ; CHECK-NEXT: [[TMP4:%.*]] = shufflevector <4 x float> [[TMP2]], <4 x float> [[A_SINK2]], <4 x i32> <i32 0, i32 1, i32 6, i32 undef>
117 ; CHECK-NEXT: [[TMP5:%.*]] = extractelement <4 x i32> [[C]], i32 3
118 ; CHECK-NEXT: [[TOBOOL11_NOT:%.*]] = icmp eq i32 [[TMP5]], 0
119 ; CHECK-NEXT: [[A_SINK3:%.*]] = select i1 [[TOBOOL11_NOT]], <4 x float> [[B]], <4 x float> [[A]]
120 ; CHECK-NEXT: [[TMP6:%.*]] = shufflevector <4 x float> [[TMP4]], <4 x float> [[A_SINK3]], <4 x i32> <i32 0, i32 1, i32 2, i32 7>
121 ; CHECK-NEXT: ret <4 x float> [[TMP6]]
124 %0 = extractelement <4 x i32> %c, i32 0
125 %tobool = icmp ne i32 %0, 0
126 %a.sink = select i1 %tobool, <4 x float> %a, <4 x float> %b
127 %1 = extractelement <4 x float> %a.sink, i32 0
128 %2 = insertelement <4 x float> poison, float %1, i32 0
129 %3 = extractelement <4 x i32> %c, i32 1
130 %tobool1 = icmp ne i32 %3, 0
131 %a.sink1 = select i1 %tobool1, <4 x float> %a, <4 x float> %b
132 %4 = extractelement <4 x float> %a.sink1, i32 1
133 %5 = insertelement <4 x float> %2, float %4, i32 1
134 %6 = extractelement <4 x i32> %c, i32 2
135 %tobool6 = icmp ne i32 %6, 0
136 %a.sink2 = select i1 %tobool6, <4 x float> %a, <4 x float> %b
137 %7 = extractelement <4 x float> %a.sink2, i32 2
138 %8 = insertelement <4 x float> %5, float %7, i32 2
139 %9 = extractelement <4 x i32> %c, i32 3
140 %tobool11 = icmp ne i32 %9, 0
141 %a.sink3 = select i1 %tobool11, <4 x float> %a, <4 x float> %b
142 %10 = extractelement <4 x float> %a.sink3, i32 3
143 %11 = insertelement <4 x float> %8, float %10, i32 3
147 define <4 x i32> @extract_cond(<4 x i32> %x, <4 x i32> %y, <4 x i1> %condv) {
148 ; CHECK-LABEL: @extract_cond(
149 ; CHECK-NEXT: [[DOTSPLAT:%.*]] = shufflevector <4 x i1> [[CONDV:%.*]], <4 x i1> undef, <4 x i32> <i32 3, i32 3, i32 3, i32 3>
150 ; CHECK-NEXT: [[R:%.*]] = select <4 x i1> [[DOTSPLAT]], <4 x i32> [[X:%.*]], <4 x i32> [[Y:%.*]]
151 ; CHECK-NEXT: ret <4 x i32> [[R]]
153 %cond = extractelement <4 x i1> %condv, i32 3
154 %r = select i1 %cond, <4 x i32> %x, <4 x i32> %y
158 define <4 x i32> @splat_cond(<4 x i32> %x, <4 x i32> %y, <4 x i1> %condv) {
159 ; CHECK-LABEL: @splat_cond(
160 ; CHECK-NEXT: [[SPLATCOND:%.*]] = shufflevector <4 x i1> [[CONDV:%.*]], <4 x i1> poison, <4 x i32> <i32 3, i32 3, i32 3, i32 3>
161 ; CHECK-NEXT: [[R:%.*]] = select <4 x i1> [[SPLATCOND]], <4 x i32> [[X:%.*]], <4 x i32> [[Y:%.*]]
162 ; CHECK-NEXT: ret <4 x i32> [[R]]
164 %splatcond = shufflevector <4 x i1> %condv, <4 x i1> poison, <4 x i32> <i32 3, i32 3, i32 3, i32 3>
165 %r = select <4 x i1> %splatcond, <4 x i32> %x, <4 x i32> %y
169 declare void @extra_use(i1)
173 define <4 x i32> @extract_cond_extra_use(<4 x i32> %x, <4 x i32> %y, <4 x i1> %condv) {
174 ; CHECK-LABEL: @extract_cond_extra_use(
175 ; CHECK-NEXT: [[COND:%.*]] = extractelement <4 x i1> [[CONDV:%.*]], i32 3
176 ; CHECK-NEXT: call void @extra_use(i1 [[COND]])
177 ; CHECK-NEXT: [[R:%.*]] = select i1 [[COND]], <4 x i32> [[X:%.*]], <4 x i32> [[Y:%.*]]
178 ; CHECK-NEXT: ret <4 x i32> [[R]]
180 %cond = extractelement <4 x i1> %condv, i32 3
181 call void @extra_use(i1 %cond)
182 %r = select i1 %cond, <4 x i32> %x, <4 x i32> %y
188 define <4 x i32> @extract_cond_variable_index(<4 x i32> %x, <4 x i32> %y, <4 x i1> %condv, i32 %index) {
189 ; CHECK-LABEL: @extract_cond_variable_index(
190 ; CHECK-NEXT: [[COND:%.*]] = extractelement <4 x i1> [[CONDV:%.*]], i32 [[INDEX:%.*]]
191 ; CHECK-NEXT: [[R:%.*]] = select i1 [[COND]], <4 x i32> [[X:%.*]], <4 x i32> [[Y:%.*]]
192 ; CHECK-NEXT: ret <4 x i32> [[R]]
194 %cond = extractelement <4 x i1> %condv, i32 %index
195 %r = select i1 %cond, <4 x i32> %x, <4 x i32> %y
199 ; IR shuffle can alter the number of elements in the vector, so this is ok.
201 define <4 x i32> @extract_cond_type_mismatch(<4 x i32> %x, <4 x i32> %y, <5 x i1> %condv) {
202 ; CHECK-LABEL: @extract_cond_type_mismatch(
203 ; CHECK-NEXT: [[DOTSPLAT:%.*]] = shufflevector <5 x i1> [[CONDV:%.*]], <5 x i1> undef, <4 x i32> <i32 1, i32 1, i32 1, i32 1>
204 ; CHECK-NEXT: [[R:%.*]] = select <4 x i1> [[DOTSPLAT]], <4 x i32> [[X:%.*]], <4 x i32> [[Y:%.*]]
205 ; CHECK-NEXT: ret <4 x i32> [[R]]
207 %cond = extractelement <5 x i1> %condv, i32 1
208 %r = select i1 %cond, <4 x i32> %x, <4 x i32> %y
213 attributes #0 = { nounwind ssp uwtable "less-precise-fpmad"="false" "frame-pointer"="all" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }