xref: /aosp_15_r20/external/llvm/test/Transforms/LoopUnswitch/2011-11-18-SimpleSwitch.ll (revision 9880d6810fe72a1726cb53787c6711e909410d58) 
1*9880d681SAndroid Build Coastguard Worker; REQUIRES: asserts
2*9880d681SAndroid Build Coastguard Worker; RUN: opt -loop-unswitch -disable-output -stats -info-output-file - < %s | FileCheck --check-prefix=STATS %s
3*9880d681SAndroid Build Coastguard Worker; RUN: opt -S -loop-unswitch -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: 2 loop-unswitch - Number of switches unswitched
7*9880d681SAndroid Build Coastguard Worker
8*9880d681SAndroid Build Coastguard Worker; CHECK:      %1 = icmp eq i32 %c, 1
9*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: br i1 %1, label %.split.us, label %..split_crit_edge
10*9880d681SAndroid Build Coastguard Worker
11*9880d681SAndroid Build Coastguard Worker; CHECK:      ..split_crit_edge:                                ; preds = %0
12*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br label %.split
13*9880d681SAndroid Build Coastguard Worker
14*9880d681SAndroid Build Coastguard Worker; CHECK:      .split.us:                                        ; preds = %0
15*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br label %loop_begin.us
16*9880d681SAndroid Build Coastguard Worker
17*9880d681SAndroid Build Coastguard Worker; CHECK:      loop_begin.us:                                    ; preds = %loop_begin.backedge.us, %.split.us
18*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   %var_val.us = load i32, i32* %var
19*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   switch i32 1, label %default.us-lcssa.us [
20*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:     i32 1, label %inc.us
21*9880d681SAndroid Build Coastguard Worker
22*9880d681SAndroid Build Coastguard Worker; CHECK:      inc.us:                                           ; preds = %loop_begin.us
23*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   call void @incf() [[NOR_NUW:#[0-9]+]]
24*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br label %loop_begin.backedge.us
25*9880d681SAndroid Build Coastguard Worker
26*9880d681SAndroid Build Coastguard Worker; CHECK:      .split:                                           ; preds = %..split_crit_edge
27*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   %2 = icmp eq i32 %c, 2
28*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br i1 %2, label %.split.split.us, label %.split..split.split_crit_edge
29*9880d681SAndroid Build Coastguard Worker
30*9880d681SAndroid Build Coastguard Worker; CHECK:      .split..split.split_crit_edge:                    ; preds = %.split
31*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br label %.split.split
32*9880d681SAndroid Build Coastguard Worker
33*9880d681SAndroid Build Coastguard Worker; CHECK:      .split.split.us:                                  ; preds = %.split
34*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br label %loop_begin.us1
35*9880d681SAndroid Build Coastguard Worker
36*9880d681SAndroid Build Coastguard Worker; CHECK:      loop_begin.us1:                                   ; preds = %loop_begin.backedge.us5, %.split.split.us
37*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   %var_val.us2 = load i32, i32* %var
38*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   switch i32 2, label %default.us-lcssa.us-lcssa.us [
39*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:     i32 1, label %inc.us4
40*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:     i32 2, label %dec.us3
41*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   ]
42*9880d681SAndroid Build Coastguard Worker
43*9880d681SAndroid Build Coastguard Worker; CHECK:      dec.us3:                                          ; preds = %loop_begin.us1
44*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   call void @decf() [[NOR_NUW]]
45*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br label %loop_begin.backedge.us5
46*9880d681SAndroid Build Coastguard Worker
47*9880d681SAndroid Build Coastguard Worker; CHECK:      .split.split:                                     ; preds = %.split..split.split_crit_edge
48*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br label %loop_begin
49*9880d681SAndroid Build Coastguard Worker
50*9880d681SAndroid Build Coastguard Worker; CHECK:      loop_begin:                                       ; preds = %loop_begin.backedge, %.split.split
51*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   %var_val = load i32, i32* %var
52*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   switch i32 %c, label %default.us-lcssa.us-lcssa [
53*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:     i32 1, label %inc
54*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:     i32 2, label %dec
55*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   ]
56*9880d681SAndroid Build Coastguard Worker
57*9880d681SAndroid Build Coastguard Worker; CHECK:      inc:                                              ; preds = %loop_begin
58*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br i1 true, label %us-unreachable.us-lcssa, label %inc.split
59*9880d681SAndroid Build Coastguard Worker
60*9880d681SAndroid Build Coastguard Worker; CHECK:      dec:                                              ; preds = %loop_begin
61*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT:   br i1 true, label %us-unreachable6, label %dec.split
62*9880d681SAndroid Build Coastguard Worker
63*9880d681SAndroid Build Coastguard Workerdefine i32 @test(i32* %var) {
64*9880d681SAndroid Build Coastguard Worker  %mem = alloca i32
65*9880d681SAndroid Build Coastguard Worker  store i32 2, i32* %mem
66*9880d681SAndroid Build Coastguard Worker  %c = load i32, i32* %mem
67*9880d681SAndroid Build Coastguard Worker
68*9880d681SAndroid Build Coastguard Worker  br label %loop_begin
69*9880d681SAndroid Build Coastguard Worker
70*9880d681SAndroid Build Coastguard Workerloop_begin:
71*9880d681SAndroid Build Coastguard Worker
72*9880d681SAndroid Build Coastguard Worker  %var_val = load i32, i32* %var
73*9880d681SAndroid Build Coastguard Worker
74*9880d681SAndroid Build Coastguard Worker  switch i32 %c, label %default [
75*9880d681SAndroid Build Coastguard Worker      i32 1, label %inc
76*9880d681SAndroid Build Coastguard Worker      i32 2, label %dec
77*9880d681SAndroid Build Coastguard Worker  ]
78*9880d681SAndroid Build Coastguard Worker
79*9880d681SAndroid Build Coastguard Workerinc:
80*9880d681SAndroid Build Coastguard Worker  call void @incf() noreturn nounwind
81*9880d681SAndroid Build Coastguard Worker  br label %loop_begin
82*9880d681SAndroid Build Coastguard Workerdec:
83*9880d681SAndroid Build Coastguard Worker  call void @decf() noreturn nounwind
84*9880d681SAndroid Build Coastguard Worker  br label %loop_begin
85*9880d681SAndroid Build Coastguard Workerdefault:
86*9880d681SAndroid Build Coastguard Worker  br label %loop_exit
87*9880d681SAndroid Build Coastguard Workerloop_exit:
88*9880d681SAndroid Build Coastguard Worker  ret i32 0
89*9880d681SAndroid Build Coastguard Worker}
90*9880d681SAndroid Build Coastguard Worker
91*9880d681SAndroid Build Coastguard Workerdeclare void @incf() noreturn
92*9880d681SAndroid Build Coastguard Workerdeclare void @decf() noreturn
93*9880d681SAndroid Build Coastguard Worker
94*9880d681SAndroid Build Coastguard Worker; CHECK: attributes #0 = { noreturn }
95*9880d681SAndroid Build Coastguard Worker; CHECK: attributes [[NOR_NUW]] = { noreturn nounwind }
96