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      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" "no-frame-pointer-elim"="false" "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" "no-frame-pointer-elim"="false" "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 ---
     73 name:            _Z3fooi
     74 alignment:       4
     75 tracksRegLiveness: true
     76 registers:       
     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 }
     86 liveins:         
     87   - { reg: '$edi', virtual-reg: '%0' }
     88 frameInfo:       
     89   hasCalls:        true
     90 body:             |
     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 8 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     JE_1 %bb.6, 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     JE_1 %bb.5, 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     JNE_1 %bb.7, 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 4 from @m, !tbaa !4)
    144     JNE_1 %bb.1, implicit killed $eflags
    145     JMP_1 %bb.8
    146   
    147   bb.8.do.end:
    148     RET 0
    149 
    150 ...
    151