1 ; RUN: opt -simplifycfg -S -o - < %s | FileCheck %s
3 declare void @helper(i32)
5 define void @test1(i1 %a, i1 %b) {
8 br i1 %a, label %Y, label %X, !prof !0
9 ; CHECK: br i1 %or.cond, label %Z, label %Y, !prof !0
13 br i1 %c, label %Z, label %Y, !prof !1
16 call void @helper(i32 0)
20 call void @helper(i32 1)
24 define void @test2(i1 %a, i1 %b) {
27 br i1 %a, label %X, label %Y, !prof !1
28 ; CHECK: br i1 %or.cond, label %Z, label %Y, !prof !1
33 br i1 %c, label %Z, label %Y, !prof !2
36 call void @helper(i32 0)
40 call void @helper(i32 1)
44 define void @test3(i1 %a, i1 %b) {
48 br i1 %a, label %X, label %Y, !prof !1
52 br i1 %c, label %Z, label %Y
55 call void @helper(i32 0)
59 call void @helper(i32 1)
63 define void @test4(i1 %a, i1 %b) {
67 br i1 %a, label %X, label %Y
71 br i1 %c, label %Z, label %Y, !prof !1
74 call void @helper(i32 0)
78 call void @helper(i32 1)
82 ;; test5 - The case where it jumps to the default target will be removed.
83 define void @test5(i32 %M, i32 %N) nounwind uwtable {
85 switch i32 %N, label %sw2 [
91 ; CHECK: switch i32 %N, label %sw2 [
92 ; CHECK: i32 3, label %sw.bb1
93 ; CHECK: i32 2, label %sw.bb
97 call void @helper(i32 0)
101 call void @helper(i32 1)
105 call void @helper(i32 2)
112 ;; test6 - Some cases of the second switch are pruned during optimization.
113 ;; Then the second switch will be converted to a branch, finally, the first
114 ;; switch and the branch will be merged into a single switch.
115 define void @test6(i32 %M, i32 %N) nounwind uwtable {
117 switch i32 %N, label %sw2 [
123 ; CHECK: switch i32 %N, label %sw.epilog
124 ; CHECK: i32 3, label %sw.bb1
125 ; CHECK: i32 2, label %sw.bb
126 ; CHECK: i32 4, label %sw.bb5
130 call void @helper(i32 0)
134 call void @helper(i32 1)
138 ;; Here "case 2" is invalidated since the default case of the first switch
139 ;; does not include "case 2".
140 switch i32 %N, label %sw.epilog [
146 call void @helper(i32 2)
150 call void @helper(i32 3)
157 ;; This test is based on test1 but swapped the targets of the second branch.
158 define void @test1_swap(i1 %a, i1 %b) {
161 br i1 %a, label %Y, label %X, !prof !0
162 ; CHECK: br i1 %or.cond, label %Y, label %Z, !prof !4
166 br i1 %c, label %Y, label %Z, !prof !1
169 call void @helper(i32 0)
173 call void @helper(i32 1)
177 define void @test7(i1 %a, i1 %b) {
181 br i1 %a, label %Y, label %X, !prof !0
182 ; CHECK: br i1 %brmerge, label %Y, label %Z, !prof !5
185 br i1 %c, label %Y, label %Z, !prof !6
188 call void @helper(i32 0)
192 call void @helper(i32 1)
196 ; Test basic folding to a conditional branch.
197 define void @test8(i64 %x, i64 %y) nounwind {
200 %lt = icmp slt i64 %x, %y
201 ; CHECK: br i1 %lt, label %a, label %b, !prof !6
202 %qux = select i1 %lt, i32 0, i32 2
203 switch i32 %qux, label %bees [
209 call void @helper(i32 0) nounwind
212 call void @helper(i32 1) nounwind
215 call void @helper(i32 2) nounwind
219 ; Test edge splitting when the default target has icmp and unconditinal
221 define i1 @test9(i32 %x, i32 %y) nounwind {
224 switch i32 %x, label %bees [
229 ; CHECK: switch i32 %x, label %bees [
230 ; CHECK: i32 0, label %a
231 ; CHECK: i32 1, label %end
232 ; CHECK: i32 2, label %end
233 ; CHECK: i32 92, label %end
237 call void @helper(i32 0) nounwind
238 %reta = icmp slt i32 %x, %y
242 %tmp = icmp eq i32 %x, 92
247 ; CHECK: %ret = phi i1 [ true, %entry ], [ false, %bees ], [ true, %entry ], [ true, %entry ]
248 %ret = phi i1 [ true, %entry ], [%tmp, %bees], [true, %entry]
249 call void @helper(i32 2) nounwind
253 define void @test10(i32 %x) nounwind readnone ssp noredzone {
255 switch i32 %x, label %lor.rhs [
256 i32 2, label %lor.end
257 i32 1, label %lor.end
258 i32 3, label %lor.end
262 call void @helper(i32 1) nounwind
266 call void @helper(i32 0) nounwind
270 ; CHECK: %x.off = add i32 %x, -1
271 ; CHECK: %switch = icmp ult i32 %x.off, 3
272 ; CHECK: br i1 %switch, label %lor.end, label %lor.rhs, !prof !8
275 ; Remove dead cases from the switch.
276 define void @test11(i32 %x) nounwind {
278 switch i32 %i, label %a [
282 ; CHECK: %cond = icmp eq i32 %i, 24
283 ; CHECK: br i1 %cond, label %c, label %a, !prof !9
286 call void @helper(i32 0) nounwind
289 call void @helper(i32 1) nounwind
292 call void @helper(i32 2) nounwind
296 !0 = metadata !{metadata !"branch_weights", i32 3, i32 5}
297 !1 = metadata !{metadata !"branch_weights", i32 1, i32 1}
298 !2 = metadata !{metadata !"branch_weights", i32 1, i32 2}
299 !3 = metadata !{metadata !"branch_weights", i32 4, i32 3, i32 2, i32 1}
300 !4 = metadata !{metadata !"branch_weights", i32 4, i32 3, i32 2, i32 1}
301 !5 = metadata !{metadata !"branch_weights", i32 7, i32 6, i32 5}
302 !6 = metadata !{metadata !"branch_weights", i32 1, i32 3}
303 !7 = metadata !{metadata !"branch_weights", i32 33, i32 9, i32 8, i32 7}
304 !8 = metadata !{metadata !"branch_weights", i32 33, i32 9, i32 8}
306 ; CHECK: !0 = metadata !{metadata !"branch_weights", i32 5, i32 11}
307 ; CHECK: !1 = metadata !{metadata !"branch_weights", i32 1, i32 5}
308 ; CHECK: !2 = metadata !{metadata !"branch_weights", i32 7, i32 1, i32 2}
309 ; CHECK: !3 = metadata !{metadata !"branch_weights", i32 49, i32 12, i32 24, i32 35}
310 ; CHECK: !4 = metadata !{metadata !"branch_weights", i32 11, i32 5}
311 ; CHECK: !5 = metadata !{metadata !"branch_weights", i32 17, i32 15}
312 ; CHECK: !6 = metadata !{metadata !"branch_weights", i32 9, i32 7}
313 ; CHECK: !7 = metadata !{metadata !"branch_weights", i32 17, i32 9, i32 8, i32 7, i32 17}
314 ; CHECK: !8 = metadata !{metadata !"branch_weights", i32 24, i32 33}
315 ; CHECK: !9 = metadata !{metadata !"branch_weights", i32 8, i32 33}