xref: /aosp_15_r20/external/llvm/test/Transforms/LoopUnswitch/2011-11-18-TwoSwitches-Threshold.ll (revision 9880d6810fe72a1726cb53787c6711e909410d58) 
1*9880d681SAndroid Build Coastguard Worker; REQUIRES: asserts
2*9880d681SAndroid Build Coastguard Worker; RUN: opt -loop-unswitch -loop-unswitch-threshold 13 -disable-output -stats -info-output-file - < %s | FileCheck --check-prefix=STATS %s
3*9880d681SAndroid Build Coastguard Worker; RUN: opt -S -loop-unswitch -loop-unswitch-threshold 13 -verify-loop-info -verify-dom-info < %s | FileCheck %s
4*9880d681SAndroid Build Coastguard Worker
5*9880d681SAndroid Build Coastguard Worker; STATS: 1 loop-simplify - Number of pre-header or exit blocks inserted
6*9880d681SAndroid Build Coastguard Worker; STATS: 1 loop-unswitch - Number of switches unswitched
7*9880d681SAndroid Build Coastguard Worker
8*9880d681SAndroid Build Coastguard Worker; ModuleID = '../llvm/test/Transforms/LoopUnswitch/2011-11-18-TwoSwitches.ll'
9*9880d681SAndroid Build Coastguard Worker
10*9880d681SAndroid Build Coastguard Worker; CHECK:        %1 = icmp eq i32 %c, 1
11*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br i1 %1, label %.split.us, label %..split_crit_edge
12*9880d681SAndroid Build Coastguard Worker
13*9880d681SAndroid Build Coastguard Worker; CHECK:      ..split_crit_edge:                                ; preds = %0
14*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br label %.split
15*9880d681SAndroid Build Coastguard Worker
16*9880d681SAndroid Build Coastguard Worker; CHECK:      .split.us:                                        ; preds = %0
17*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br label %loop_begin.us
18*9880d681SAndroid Build Coastguard Worker
19*9880d681SAndroid Build Coastguard Worker; CHECK:      loop_begin.us:                                    ; preds = %loop_begin.backedge.us, %.split.us
20*9880d681SAndroid Build Coastguard Worker; CHECK:        switch i32 1, label %second_switch.us [
21*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:     i32 1, label %inc.us
22*9880d681SAndroid Build Coastguard Worker
23*9880d681SAndroid Build Coastguard Worker; CHECK:      second_switch.us:                                 ; preds = %loop_begin.us
24*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   switch i32 %d, label %default.us [
25*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:     i32 1, label %inc.us
26*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   ]
27*9880d681SAndroid Build Coastguard Worker
28*9880d681SAndroid Build Coastguard Worker; CHECK:      inc.us:                                           ; preds = %second_switch.us, %loop_begin.us
29*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   call void @incf() [[NOR_NUW:#[0-9]+]]
30*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br label %loop_begin.backedge.us
31*9880d681SAndroid Build Coastguard Worker
32*9880d681SAndroid Build Coastguard Worker; CHECK:      .split:                                           ; preds = %..split_crit_edge
33*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br label %loop_begin
34*9880d681SAndroid Build Coastguard Worker
35*9880d681SAndroid Build Coastguard Worker; CHECK:      loop_begin:                                       ; preds = %loop_begin.backedge, %.split
36*9880d681SAndroid Build Coastguard Worker; CHECK:        switch i32 %c, label %second_switch [
37*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:     i32 1, label %loop_begin.inc_crit_edge
38*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   ]
39*9880d681SAndroid Build Coastguard Worker
40*9880d681SAndroid Build Coastguard Worker; CHECK:      loop_begin.inc_crit_edge:                         ; preds = %loop_begin
41*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br i1 true, label %us-unreachable, label %inc
42*9880d681SAndroid Build Coastguard Worker
43*9880d681SAndroid Build Coastguard Worker; CHECK:      second_switch:                                    ; preds = %loop_begin
44*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   switch i32 %d, label %default [
45*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:     i32 1, label %inc
46*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   ]
47*9880d681SAndroid Build Coastguard Worker
48*9880d681SAndroid Build Coastguard Worker; CHECK:      inc:                                              ; preds = %loop_begin.inc_crit_edge, %second_switch
49*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   call void @incf() [[NOR_NUW]]
50*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br label %loop_begin.backedge
51*9880d681SAndroid Build Coastguard Worker
52*9880d681SAndroid Build Coastguard Workerdefine i32 @test(i32* %var) {
53*9880d681SAndroid Build Coastguard Worker  %mem = alloca i32
54*9880d681SAndroid Build Coastguard Worker  store i32 2, i32* %mem
55*9880d681SAndroid Build Coastguard Worker  %c = load i32, i32* %mem
56*9880d681SAndroid Build Coastguard Worker  %d = load i32, i32* %mem
57*9880d681SAndroid Build Coastguard Worker
58*9880d681SAndroid Build Coastguard Worker  br label %loop_begin
59*9880d681SAndroid Build Coastguard Worker
60*9880d681SAndroid Build Coastguard Workerloop_begin:
61*9880d681SAndroid Build Coastguard Worker
62*9880d681SAndroid Build Coastguard Worker  %var_val = load i32, i32* %var
63*9880d681SAndroid Build Coastguard Worker
64*9880d681SAndroid Build Coastguard Worker  switch i32 %c, label %second_switch [
65*9880d681SAndroid Build Coastguard Worker      i32 1, label %inc
66*9880d681SAndroid Build Coastguard Worker  ]
67*9880d681SAndroid Build Coastguard Worker
68*9880d681SAndroid Build Coastguard Workersecond_switch:
69*9880d681SAndroid Build Coastguard Worker  switch i32 %d, label %default [
70*9880d681SAndroid Build Coastguard Worker      i32 1, label %inc
71*9880d681SAndroid Build Coastguard Worker  ]
72*9880d681SAndroid Build Coastguard Worker
73*9880d681SAndroid Build Coastguard Workerinc:
74*9880d681SAndroid Build Coastguard Worker  call void @incf() noreturn nounwind
75*9880d681SAndroid Build Coastguard Worker  br label %loop_begin
76*9880d681SAndroid Build Coastguard Worker
77*9880d681SAndroid Build Coastguard Workerdefault:
78*9880d681SAndroid Build Coastguard Worker  br label %loop_begin
79*9880d681SAndroid Build Coastguard Worker
80*9880d681SAndroid Build Coastguard Workerloop_exit:
81*9880d681SAndroid Build Coastguard Worker  ret i32 0
82*9880d681SAndroid Build Coastguard Worker}
83*9880d681SAndroid Build Coastguard Worker
84*9880d681SAndroid Build Coastguard Workerdeclare void @incf() noreturn
85*9880d681SAndroid Build Coastguard Workerdeclare void @decf() noreturn
86*9880d681SAndroid Build Coastguard Worker
87*9880d681SAndroid Build Coastguard Worker; CHECK: attributes #0 = { noreturn }
88*9880d681SAndroid Build Coastguard Worker; CHECK: attributes [[NOR_NUW]] = { noreturn nounwind }
89