1 ; RUN: opt -S -simplifycfg -mtriple=x86_64-unknown-unknown -mattr=+bmi < %s | FileCheck %s --check-prefix=ALL --check-prefix=BMI
2 ; RUN: opt -S -simplifycfg -mtriple=x86_64-unknown-unknown -mattr=+lzcnt < %s | FileCheck %s --check-prefix=ALL --check-prefix=LZCNT
3 ; RUN: opt -S -simplifycfg -mtriple=x86_64-unknown-unknown < %s | FileCheck %s --check-prefix=ALL --check-prefix=GENERIC
6 define i64 @test1(i64 %A) {
8 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i64 %A, 0
9 ; ALL: [[CTLZ:%[A-Za-z0-9]+]] = tail call i64 @llvm.ctlz.i64(i64 %A, i1 true)
10 ; LZCNT-NEXT: select i1 [[COND]], i64 64, i64 [[CTLZ]]
15 %tobool = icmp eq i64 %A, 0
16 br i1 %tobool, label %cond.end, label %cond.true
18 cond.true: ; preds = %entry
19 %0 = tail call i64 @llvm.ctlz.i64(i64 %A, i1 true)
22 cond.end: ; preds = %entry, %cond.true
23 %cond = phi i64 [ %0, %cond.true ], [ 64, %entry ]
27 define i32 @test2(i32 %A) {
29 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i32 %A, 0
30 ; ALL: [[CTLZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.ctlz.i32(i32 %A, i1 true)
31 ; LZCNT-NEXT: select i1 [[COND]], i32 32, i32 [[CTLZ]]
36 %tobool = icmp eq i32 %A, 0
37 br i1 %tobool, label %cond.end, label %cond.true
39 cond.true: ; preds = %entry
40 %0 = tail call i32 @llvm.ctlz.i32(i32 %A, i1 true)
43 cond.end: ; preds = %entry, %cond.true
44 %cond = phi i32 [ %0, %cond.true ], [ 32, %entry ]
49 define signext i16 @test3(i16 signext %A) {
51 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i16 %A, 0
52 ; ALL: [[CTLZ:%[A-Za-z0-9]+]] = tail call i16 @llvm.ctlz.i16(i16 %A, i1 true)
53 ; LZCNT-NEXT: select i1 [[COND]], i16 16, i16 [[CTLZ]]
58 %tobool = icmp eq i16 %A, 0
59 br i1 %tobool, label %cond.end, label %cond.true
61 cond.true: ; preds = %entry
62 %0 = tail call i16 @llvm.ctlz.i16(i16 %A, i1 true)
65 cond.end: ; preds = %entry, %cond.true
66 %cond = phi i16 [ %0, %cond.true ], [ 16, %entry ]
71 define i64 @test1b(i64 %A) {
73 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i64 %A, 0
74 ; ALL: [[CTTZ:%[A-Za-z0-9]+]] = tail call i64 @llvm.cttz.i64(i64 %A, i1 true)
75 ; BMI-NEXT: select i1 [[COND]], i64 64, i64 [[CTTZ]]
80 %tobool = icmp eq i64 %A, 0
81 br i1 %tobool, label %cond.end, label %cond.true
83 cond.true: ; preds = %entry
84 %0 = tail call i64 @llvm.cttz.i64(i64 %A, i1 true)
87 cond.end: ; preds = %entry, %cond.true
88 %cond = phi i64 [ %0, %cond.true ], [ 64, %entry ]
93 define i32 @test2b(i32 %A) {
95 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i32 %A, 0
96 ; ALL: [[CTTZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.cttz.i32(i32 %A, i1 true)
97 ; BMI-NEXT: select i1 [[COND]], i32 32, i32 [[CTTZ]]
102 %tobool = icmp eq i32 %A, 0
103 br i1 %tobool, label %cond.end, label %cond.true
105 cond.true: ; preds = %entry
106 %0 = tail call i32 @llvm.cttz.i32(i32 %A, i1 true)
109 cond.end: ; preds = %entry, %cond.true
110 %cond = phi i32 [ %0, %cond.true ], [ 32, %entry ]
115 define signext i16 @test3b(i16 signext %A) {
116 ; ALL-LABEL: @test3b(
117 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i16 %A, 0
118 ; ALL: [[CTTZ:%[A-Za-z0-9]+]] = tail call i16 @llvm.cttz.i16(i16 %A, i1 true)
119 ; BMI-NEXT: select i1 [[COND]], i16 16, i16 [[CTTZ]]
121 ; GENERIC-NOT: select
124 %tobool = icmp eq i16 %A, 0
125 br i1 %tobool, label %cond.end, label %cond.true
127 cond.true: ; preds = %entry
128 %0 = tail call i16 @llvm.cttz.i16(i16 %A, i1 true)
131 cond.end: ; preds = %entry, %cond.true
132 %cond = phi i16 [ %0, %cond.true ], [ 16, %entry ]
136 ; The following tests verify that calls to cttz/ctlz are speculated even if
137 ; basic block %cond.true has an extra zero extend/truncate which is "free"
140 define i64 @test1e(i32 %x) {
141 ; ALL-LABEL: @test1e(
142 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i32 %x, 0
143 ; ALL: [[CTTZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.cttz.i32(i32 %x, i1 true)
144 ; ALL: [[ZEXT:%[A-Za-z0-9]+]] = zext i32 [[CTTZ]] to i64
145 ; BMI-NEXT: select i1 [[COND]], i64 32, i64 [[ZEXT]]
147 ; GENERIC-NOT: select
150 %tobool = icmp eq i32 %x, 0
151 br i1 %tobool, label %cond.end, label %cond.true
153 cond.true: ; preds = %entry
154 %0 = tail call i32 @llvm.cttz.i32(i32 %x, i1 true)
155 %phitmp2 = zext i32 %0 to i64
158 cond.end: ; preds = %entry, %cond.true
159 %cond = phi i64 [ %phitmp2, %cond.true ], [ 32, %entry ]
163 define i32 @test2e(i64 %x) {
164 ; ALL-LABEL: @test2e(
165 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i64 %x, 0
166 ; ALL: [[CTTZ:%[A-Za-z0-9]+]] = tail call i64 @llvm.cttz.i64(i64 %x, i1 true)
167 ; ALL: [[TRUNC:%[A-Za-z0-9]+]] = trunc i64 [[CTTZ]] to i32
168 ; BMI-NEXT: select i1 [[COND]], i32 64, i32 [[TRUNC]]
170 ; GENERIC-NOT: select
173 %tobool = icmp eq i64 %x, 0
174 br i1 %tobool, label %cond.end, label %cond.true
176 cond.true: ; preds = %entry
177 %0 = tail call i64 @llvm.cttz.i64(i64 %x, i1 true)
178 %cast = trunc i64 %0 to i32
181 cond.end: ; preds = %entry, %cond.true
182 %cond = phi i32 [ %cast, %cond.true ], [ 64, %entry ]
186 define i64 @test3e(i32 %x) {
187 ; ALL-LABEL: @test3e(
188 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i32 %x, 0
189 ; ALL: [[CTLZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.ctlz.i32(i32 %x, i1 true)
190 ; ALL: [[ZEXT:%[A-Za-z0-9]+]] = zext i32 [[CTLZ]] to i64
191 ; LZCNT-NEXT: select i1 [[COND]], i64 32, i64 [[ZEXT]]
193 ; GENERIC-NOT: select
196 %tobool = icmp eq i32 %x, 0
197 br i1 %tobool, label %cond.end, label %cond.true
199 cond.true: ; preds = %entry
200 %0 = tail call i32 @llvm.ctlz.i32(i32 %x, i1 true)
201 %phitmp2 = zext i32 %0 to i64
204 cond.end: ; preds = %entry, %cond.true
205 %cond = phi i64 [ %phitmp2, %cond.true ], [ 32, %entry ]
209 define i32 @test4e(i64 %x) {
210 ; ALL-LABEL: @test4e(
211 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i64 %x, 0
212 ; ALL: [[CTLZ:%[A-Za-z0-9]+]] = tail call i64 @llvm.ctlz.i64(i64 %x, i1 true)
213 ; ALL: [[TRUNC:%[A-Za-z0-9]+]] = trunc i64 [[CTLZ]] to i32
214 ; LZCNT-NEXT: select i1 [[COND]], i32 64, i32 [[TRUNC]]
216 ; GENERIC-NOT: select
219 %tobool = icmp eq i64 %x, 0
220 br i1 %tobool, label %cond.end, label %cond.true
222 cond.true: ; preds = %entry
223 %0 = tail call i64 @llvm.ctlz.i64(i64 %x, i1 true)
224 %cast = trunc i64 %0 to i32
227 cond.end: ; preds = %entry, %cond.true
228 %cond = phi i32 [ %cast, %cond.true ], [ 64, %entry ]
232 define i16 @test5e(i64 %x) {
233 ; ALL-LABEL: @test5e(
234 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i64 %x, 0
235 ; ALL: [[CTLZ:%[A-Za-z0-9]+]] = tail call i64 @llvm.ctlz.i64(i64 %x, i1 true)
236 ; ALL: [[TRUNC:%[A-Za-z0-9]+]] = trunc i64 [[CTLZ]] to i16
237 ; LZCNT-NEXT: select i1 [[COND]], i16 64, i16 [[TRUNC]]
239 ; GENERIC-NOT: select
242 %tobool = icmp eq i64 %x, 0
243 br i1 %tobool, label %cond.end, label %cond.true
245 cond.true: ; preds = %entry
246 %0 = tail call i64 @llvm.ctlz.i64(i64 %x, i1 true)
247 %cast = trunc i64 %0 to i16
250 cond.end: ; preds = %entry, %cond.true
251 %cond = phi i16 [ %cast, %cond.true ], [ 64, %entry ]
255 define i16 @test6e(i32 %x) {
256 ; ALL-LABEL: @test6e(
257 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i32 %x, 0
258 ; ALL: [[CTLZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.ctlz.i32(i32 %x, i1 true)
259 ; ALL: [[TRUNC:%[A-Za-z0-9]+]] = trunc i32 [[CTLZ]] to i16
260 ; LZCNT-NEXT: select i1 [[COND]], i16 32, i16 [[TRUNC]]
262 ; GENERIC-NOT: select
265 %tobool = icmp eq i32 %x, 0
266 br i1 %tobool, label %cond.end, label %cond.true
268 cond.true: ; preds = %entry
269 %0 = tail call i32 @llvm.ctlz.i32(i32 %x, i1 true)
270 %cast = trunc i32 %0 to i16
273 cond.end: ; preds = %entry, %cond.true
274 %cond = phi i16 [ %cast, %cond.true ], [ 32, %entry ]
278 define i16 @test7e(i64 %x) {
279 ; ALL-LABEL: @test7e(
280 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i64 %x, 0
281 ; ALL: [[CTTZ:%[A-Za-z0-9]+]] = tail call i64 @llvm.cttz.i64(i64 %x, i1 true)
282 ; ALL: [[TRUNC:%[A-Za-z0-9]+]] = trunc i64 [[CTTZ]] to i16
283 ; BMI-NEXT: select i1 [[COND]], i16 64, i16 [[TRUNC]]
285 ; GENERIC-NOT: select
288 %tobool = icmp eq i64 %x, 0
289 br i1 %tobool, label %cond.end, label %cond.true
291 cond.true: ; preds = %entry
292 %0 = tail call i64 @llvm.cttz.i64(i64 %x, i1 true)
293 %cast = trunc i64 %0 to i16
296 cond.end: ; preds = %entry, %cond.true
297 %cond = phi i16 [ %cast, %cond.true ], [ 64, %entry ]
301 define i16 @test8e(i32 %x) {
302 ; ALL-LABEL: @test8e(
303 ; ALL: [[COND:%[A-Za-z0-9]+]] = icmp eq i32 %x, 0
304 ; ALL: [[CTTZ:%[A-Za-z0-9]+]] = tail call i32 @llvm.cttz.i32(i32 %x, i1 true)
305 ; ALL: [[TRUNC:%[A-Za-z0-9]+]] = trunc i32 [[CTTZ]] to i16
306 ; BMI-NEXT: select i1 [[COND]], i16 32, i16 [[TRUNC]]
308 ; GENERIC-NOT: select
311 %tobool = icmp eq i32 %x, 0
312 br i1 %tobool, label %cond.end, label %cond.true
314 cond.true: ; preds = %entry
315 %0 = tail call i32 @llvm.cttz.i32(i32 %x, i1 true)
316 %cast = trunc i32 %0 to i16
319 cond.end: ; preds = %entry, %cond.true
320 %cond = phi i16 [ %cast, %cond.true ], [ 32, %entry ]
325 declare i64 @llvm.ctlz.i64(i64, i1)
326 declare i32 @llvm.ctlz.i32(i32, i1)
327 declare i16 @llvm.ctlz.i16(i16, i1)
328 declare i64 @llvm.cttz.i64(i64, i1)
329 declare i32 @llvm.cttz.i32(i32, i1)
330 declare i16 @llvm.cttz.i16(i16, i1)