1 ; RUN: llc < %s -asm-verbose=false -disable-block-placement | FileCheck %s
2 ; RUN: llc < %s -asm-verbose=false | FileCheck -check-prefix=OPT %s
4 ; Test the CFG stackifier pass.
6 target datalayout = "e-p:32:32-i64:64-n32:64-S128"
7 target triple = "wasm32-unknown-unknown"
9 declare void @something()
11 ; Test that loops are made contiguous, even in the presence of split backedges.
20 ; CHECK: br BB0_1{{$}}
31 define void @test0(i32 %n) {
36 %i = phi i32 [ 0, %entry ], [ %i.next, %back ]
37 %i.next = add i32 %i, 1
39 %c = icmp slt i32 %i.next, %n
40 br i1 %c, label %back, label %exit
46 call void @something()
50 ; Same as test0, but the branch condition is reversed.
59 ; CHECK: br BB1_1{{$}}
70 define void @test1(i32 %n) {
75 %i = phi i32 [ 0, %entry ], [ %i.next, %back ]
76 %i.next = add i32 %i, 1
78 %c = icmp sge i32 %i.next, %n
79 br i1 %c, label %exit, label %back
85 call void @something()
89 ; Test that a simple loop is handled as expected.
92 ; CHECK: block BB2_2{{$}}
93 ; CHECK: br_if {{[^,]*}}, BB2_2{{$}}
95 ; CHECK: br_if ${{[0-9]+}}, BB2_1{{$}}
99 ; OPT: block BB2_2{{$}}
100 ; OPT: br_if {{[^,]*}}, BB2_2{{$}}
102 ; OPT: br_if ${{[0-9]+}}, BB2_1{{$}}
105 define void @test2(double* nocapture %p, i32 %n) {
107 %cmp.4 = icmp sgt i32 %n, 0
108 br i1 %cmp.4, label %for.body.preheader, label %for.end
114 %i.05 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
115 %arrayidx = getelementptr inbounds double, double* %p, i32 %i.05
116 %0 = load double, double* %arrayidx, align 8
117 %mul = fmul double %0, 3.200000e+00
118 store double %mul, double* %arrayidx, align 8
119 %inc = add nuw nsw i32 %i.05, 1
120 %exitcond = icmp eq i32 %inc, %n
121 br i1 %exitcond, label %for.end.loopexit, label %for.body
130 ; CHECK-LABEL: doublediamond:
131 ; CHECK: block BB3_5{{$}}
132 ; CHECK: block BB3_2{{$}}
133 ; CHECK: br_if $0, BB3_2{{$}}
134 ; CHECK: block BB3_4{{$}}
135 ; CHECK: br_if $1, BB3_4{{$}}
136 ; CHECK: br BB3_5{{$}}
139 ; CHECK: return ${{[0-9]+}}{{$}}
140 ; OPT-LABEL: doublediamond:
141 ; OPT: block BB3_5{{$}}
142 ; OPT: block BB3_4{{$}}
143 ; OPT: br_if {{[^,]*}}, BB3_4{{$}}
144 ; OPT: block BB3_3{{$}}
145 ; OPT: br_if {{[^,]*}}, BB3_3{{$}}
149 ; OPT: return ${{[0-9]+}}{{$}}
150 define i32 @doublediamond(i32 %a, i32 %b, i32* %p) {
152 %c = icmp eq i32 %a, 0
153 %d = icmp eq i32 %b, 0
154 store volatile i32 0, i32* %p
155 br i1 %c, label %true, label %false
157 store volatile i32 1, i32* %p
160 store volatile i32 2, i32* %p
161 br i1 %d, label %ft, label %ff
163 store volatile i32 3, i32* %p
166 store volatile i32 4, i32* %p
169 store volatile i32 5, i32* %p
173 ; CHECK-LABEL: triangle:
174 ; CHECK: block BB4_2{{$}}
175 ; CHECK: br_if $1, BB4_2{{$}}
177 ; CHECK: return ${{[0-9]+}}{{$}}
178 ; OPT-LABEL: triangle:
179 ; OPT: block BB4_2{{$}}
180 ; OPT: br_if $1, BB4_2{{$}}
182 ; OPT: return ${{[0-9]+}}{{$}}
183 define i32 @triangle(i32* %p, i32 %a) {
185 %c = icmp eq i32 %a, 0
186 store volatile i32 0, i32* %p
187 br i1 %c, label %true, label %exit
189 store volatile i32 1, i32* %p
192 store volatile i32 2, i32* %p
196 ; CHECK-LABEL: diamond:
197 ; CHECK: block BB5_3{{$}}
198 ; CHECK: block BB5_2{{$}}
199 ; CHECK: br_if $1, BB5_2{{$}}
200 ; CHECK: br BB5_3{{$}}
203 ; CHECK: return ${{[0-9]+}}{{$}}
204 ; OPT-LABEL: diamond:
205 ; OPT: block BB5_3{{$}}
206 ; OPT: block BB5_2{{$}}
207 ; OPT: br_if {{[^,]*}}, BB5_2{{$}}
211 ; OPT: return ${{[0-9]+}}{{$}}
212 define i32 @diamond(i32* %p, i32 %a) {
214 %c = icmp eq i32 %a, 0
215 store volatile i32 0, i32* %p
216 br i1 %c, label %true, label %false
218 store volatile i32 1, i32* %p
221 store volatile i32 2, i32* %p
224 store volatile i32 3, i32* %p
228 ; CHECK-LABEL: single_block:
230 ; CHECK: return $pop{{[0-9]+}}{{$}}
231 ; OPT-LABEL: single_block:
233 ; OPT: return $pop{{[0-9]+}}{{$}}
234 define i32 @single_block(i32* %p) {
236 store volatile i32 0, i32* %p
240 ; CHECK-LABEL: minimal_loop:
243 ; CHECK: i32.store $discard=, 0($0), $pop{{[0-9]+}}{{$}}
244 ; CHECK: br BB7_1{{$}}
246 ; OPT-LABEL: minimal_loop:
249 ; OPT: i32.store $discard=, 0($0), $pop{{[0-9]+}}{{$}}
252 define i32 @minimal_loop(i32* %p) {
254 store volatile i32 0, i32* %p
257 store volatile i32 1, i32* %p
261 ; CHECK-LABEL: simple_loop:
264 ; CHECK: loop BB8_2{{$}}
265 ; CHECK: br_if $pop{{[0-9]+}}, BB8_1{{$}}
267 ; CHECK: return ${{[0-9]+}}{{$}}
268 ; OPT-LABEL: simple_loop:
271 ; OPT: loop BB8_2{{$}}
272 ; OPT: br_if {{[^,]*}}, BB8_1{{$}}
274 ; OPT: return ${{[0-9]+}}{{$}}
275 define i32 @simple_loop(i32* %p, i32 %a) {
277 %c = icmp eq i32 %a, 0
278 store volatile i32 0, i32* %p
281 store volatile i32 1, i32* %p
282 br i1 %c, label %loop, label %exit
284 store volatile i32 2, i32* %p
288 ; CHECK-LABEL: doubletriangle:
289 ; CHECK: block BB9_4{{$}}
290 ; CHECK: br_if $0, BB9_4{{$}}
291 ; CHECK: block BB9_3{{$}}
292 ; CHECK: br_if $1, BB9_3{{$}}
295 ; CHECK: return ${{[0-9]+}}{{$}}
296 ; OPT-LABEL: doubletriangle:
297 ; OPT: block BB9_4{{$}}
298 ; OPT: br_if $0, BB9_4{{$}}
299 ; OPT: block BB9_3{{$}}
300 ; OPT: br_if $1, BB9_3{{$}}
303 ; OPT: return ${{[0-9]+}}{{$}}
304 define i32 @doubletriangle(i32 %a, i32 %b, i32* %p) {
306 %c = icmp eq i32 %a, 0
307 %d = icmp eq i32 %b, 0
308 store volatile i32 0, i32* %p
309 br i1 %c, label %true, label %exit
311 store volatile i32 2, i32* %p
312 br i1 %d, label %tt, label %tf
314 store volatile i32 3, i32* %p
317 store volatile i32 4, i32* %p
320 store volatile i32 5, i32* %p
324 ; CHECK-LABEL: ifelse_earlyexits:
325 ; CHECK: block BB10_4{{$}}
326 ; CHECK: block BB10_2{{$}}
327 ; CHECK: br_if $0, BB10_2{{$}}
328 ; CHECK: br BB10_4{{$}}
330 ; CHECK: br_if $1, BB10_4{{$}}
332 ; CHECK: return ${{[0-9]+}}{{$}}
333 ; OPT-LABEL: ifelse_earlyexits:
334 ; OPT: block BB10_4{{$}}
335 ; OPT: block BB10_3{{$}}
336 ; OPT: br_if {{[^,]*}}, BB10_3{{$}}
337 ; OPT: br_if $1, BB10_4{{$}}
338 ; OPT: br BB10_4{{$}}
341 ; OPT: return ${{[0-9]+}}{{$}}
342 define i32 @ifelse_earlyexits(i32 %a, i32 %b, i32* %p) {
344 %c = icmp eq i32 %a, 0
345 %d = icmp eq i32 %b, 0
346 store volatile i32 0, i32* %p
347 br i1 %c, label %true, label %false
349 store volatile i32 1, i32* %p
352 store volatile i32 2, i32* %p
353 br i1 %d, label %ft, label %exit
355 store volatile i32 3, i32* %p
358 store volatile i32 4, i32* %p
362 ; CHECK-LABEL: doublediamond_in_a_loop:
364 ; CHECK: loop BB11_7{{$}}
365 ; CHECK: block BB11_6{{$}}
366 ; CHECK: block BB11_3{{$}}
367 ; CHECK: br_if $0, BB11_3{{$}}
368 ; CHECK: br BB11_6{{$}}
370 ; CHECK: block BB11_5{{$}}
371 ; CHECK: br_if $1, BB11_5{{$}}
372 ; CHECK: br BB11_6{{$}}
375 ; CHECK: br BB11_1{{$}}
377 ; OPT-LABEL: doublediamond_in_a_loop:
379 ; OPT: loop BB11_7{{$}}
380 ; OPT: block BB11_6{{$}}
381 ; OPT: block BB11_5{{$}}
382 ; OPT: br_if {{[^,]*}}, BB11_5{{$}}
383 ; OPT: block BB11_4{{$}}
384 ; OPT: br_if {{[^,]*}}, BB11_4{{$}}
385 ; OPT: br BB11_6{{$}}
387 ; OPT: br BB11_6{{$}}
390 ; OPT: br BB11_1{{$}}
392 define i32 @doublediamond_in_a_loop(i32 %a, i32 %b, i32* %p) {
396 %c = icmp eq i32 %a, 0
397 %d = icmp eq i32 %b, 0
398 store volatile i32 0, i32* %p
399 br i1 %c, label %true, label %false
401 store volatile i32 1, i32* %p
404 store volatile i32 2, i32* %p
405 br i1 %d, label %ft, label %ff
407 store volatile i32 3, i32* %p
410 store volatile i32 4, i32* %p
413 store volatile i32 5, i32* %p
417 ; Test that nested loops are handled.
421 define void @test3(i32 %w) {
423 br i1 undef, label %outer.ph, label %exit
429 %tobool = icmp eq i32 undef, 0
430 br i1 %tobool, label %inner, label %unreachable
436 %c = icmp eq i32 undef, %w
437 br i1 %c, label %if.end, label %inner