1# REQUIRES: asserts
2# RUN: llc -mtriple=x86_64-- -run-pass=greedy %s -debug-only=regalloc -huge-size-for-split=0 -o /dev/null 2>&1 | FileCheck %s
3# Check no global region split is needed because the live range to split is trivially rematerializable.
4# CHECK-NOT: Compact region bundles
5--- |
6  ; ModuleID = '<stdin>'
7  source_filename = "2.cc"
8  target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
9  target triple = "x86_64-unknown-linux-gnu"
10
11  @m = local_unnamed_addr global i32 0, align 4
12  @.str = private unnamed_addr constant [4 x i8] c"abc\00", align 1
13  @.str.1 = private unnamed_addr constant [4 x i8] c"def\00", align 1
14  @.str.2 = private unnamed_addr constant [4 x i8] c"ghi\00", align 1
15
16  ; Function Attrs: uwtable
17  define void @_Z3fooi(i32 %value) local_unnamed_addr #0 {
18  entry:
19    br label %do.body
20
21  do.body:                                          ; preds = %do.cond, %entry
22    tail call void asm sideeffect "", "~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() #2, !srcloc !3
23    switch i32 %value, label %do.cond [
24      i32 0, label %sw.bb
25      i32 1, label %sw.bb1
26      i32 2, label %sw.bb2
27    ]
28
29  sw.bb:                                            ; preds = %do.body
30    tail call void @_Z3gooPKc(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0))
31    br label %sw.bb1
32
33  sw.bb1:                                           ; preds = %sw.bb, %do.body
34    tail call void @_Z3gooPKc(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0))
35    br label %sw.bb2
36
37  sw.bb2:                                           ; preds = %sw.bb1, %do.body
38    tail call void @_Z3gooPKc(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0))
39    br label %do.cond
40
41  do.cond:                                          ; preds = %sw.bb2, %do.body
42    %0 = load i32, i32* @m, align 4, !tbaa !4
43    %cmp = icmp eq i32 %0, 5
44    br i1 %cmp, label %do.end, label %do.body
45
46  do.end:                                           ; preds = %do.cond
47    ret void
48  }
49
50  declare void @_Z3gooPKc(i8*) local_unnamed_addr #1
51
52  ; Function Attrs: nounwind
53  declare void @llvm.stackprotector(i8*, i8**) #2
54
55  attributes #0 = { uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
56  attributes #1 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
57  attributes #2 = { nounwind }
58
59  !llvm.module.flags = !{!0, !1}
60  !llvm.ident = !{!2}
61
62  !0 = !{i32 1, !"wchar_size", i32 4}
63  !1 = !{i32 7, !"PIC Level", i32 2}
64  !2 = !{!"clang version 7.0.0 (trunk 335057)"}
65  !3 = !{i32 80}
66  !4 = !{!5, !5, i64 0}
67  !5 = !{!"int", !6, i64 0}
68  !6 = !{!"omnipotent char", !7, i64 0}
69  !7 = !{!"Simple C++ TBAA"}
70
71...
72---
73name:            _Z3fooi
74alignment:       16
75tracksRegLiveness: true
76registers:
77  - { id: 0, class: gr32 }
78  - { id: 1, class: gr32 }
79  - { id: 2, class: gr32 }
80  - { id: 3, class: gr64 }
81  - { id: 4, class: gr64 }
82  - { id: 5, class: gr64 }
83  - { id: 6, class: gr64 }
84  - { id: 7, class: gr32 }
85  - { id: 8, class: gr32 }
86liveins:
87  - { reg: '$edi', virtual-reg: '%0' }
88frameInfo:
89  hasCalls:        true
90body:             |
91  bb.0.entry:
92    liveins: $edi
93
94    %0:gr32 = COPY $edi
95    %5:gr64 = LEA64r $rip, 1, $noreg, @.str.2, $noreg
96    %6:gr64 = MOV64rm $rip, 1, $noreg, target-flags(x86-gotpcrel) @m, $noreg :: (load (s64) from got)
97    %4:gr64 = LEA64r $rip, 1, $noreg, @.str.1, $noreg
98    %3:gr64 = LEA64r $rip, 1, $noreg, @.str, $noreg
99
100  bb.1.do.body:
101    successors: %bb.6(0x20000000), %bb.2(0x60000000)
102
103    INLINEASM &"", 1, 12, implicit-def dead early-clobber $r10, 12, implicit-def dead early-clobber $r11, 12, implicit-def dead early-clobber $r12, 12, implicit-def dead early-clobber $r13, 12, implicit-def dead early-clobber $r14, 12, implicit-def dead early-clobber $r15, 12, implicit-def dead early-clobber $eflags, !3
104    CMP32ri8 %0, 2, implicit-def $eflags
105    JCC_1 %bb.6, 4, implicit killed $eflags
106    JMP_1 %bb.2
107
108  bb.2.do.body:
109    successors: %bb.5(0x2aaaaaab), %bb.3(0x55555555)
110
111    CMP32ri8 %0, 1, implicit-def $eflags
112    JCC_1 %bb.5, 4, implicit killed $eflags
113    JMP_1 %bb.3
114
115  bb.3.do.body:
116    successors: %bb.4, %bb.7
117
118    TEST32rr %0, %0, implicit-def $eflags
119    JCC_1 %bb.7, 5, implicit killed $eflags
120    JMP_1 %bb.4
121
122  bb.4.sw.bb:
123    ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
124    $rdi = COPY %3
125    CALL64pcrel32 target-flags(x86-plt) @_Z3gooPKc, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp
126    ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
127
128  bb.5.sw.bb1:
129    ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
130    $rdi = COPY %4
131    CALL64pcrel32 target-flags(x86-plt) @_Z3gooPKc, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp
132    ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
133
134  bb.6.sw.bb2:
135    ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
136    $rdi = COPY %5
137    CALL64pcrel32 target-flags(x86-plt) @_Z3gooPKc, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp
138    ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
139
140  bb.7.do.cond:
141    successors: %bb.8(0x04000000), %bb.1(0x7c000000)
142
143    CMP32mi8 %6, 1, $noreg, 0, $noreg, 5, implicit-def $eflags :: (dereferenceable load (s32) from @m, !tbaa !4)
144    JCC_1 %bb.1, 5, implicit killed $eflags
145    JMP_1 %bb.8
146
147  bb.8.do.end:
148    RET 0
149
150...
151