llvm/test/Transforms/SimplifyCFG/callbr-destinations.ll

   1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
   2 ; RUN: opt < %s -S -passes="simplifycfg<sink-common-insts>" \
   3 ; RUN:   -simplifycfg-require-and-preserve-domtree=1 | FileCheck %s
   4
   5 define void @callbr_duplicate_dest() {
   6 ; CHECK-LABEL: @callbr_duplicate_dest(
   7 ; CHECK-NEXT:  entry:
   8 ; CHECK-NEXT:    callbr void asm sideeffect "", "!i"()
   9 ; CHECK-NEXT:            to label [[BB:%.*]] [label %bb]
  10 ; CHECK:       bb:
  11 ; CHECK-NEXT:    ret void
  12 ;
  13 entry:
  14   callbr void asm sideeffect "", "!i"()
  15   to label %bb [label %bb]
  16
  17 bb:
  18   ret void
  19 }
  20
  21 define void @callbr_can_fold_to_duplicate_dest1() {
  22 ; CHECK-LABEL: @callbr_can_fold_to_duplicate_dest1(
  23 ; CHECK-NEXT:  entry:
  24 ; CHECK-NEXT:    callbr void asm sideeffect "", "!i"()
  25 ; CHECK-NEXT:            to label [[COMMON_RET:%.*]] [label %common.ret]
  26 ; CHECK:       common.ret:
  27 ; CHECK-NEXT:    ret void
  28 ;
  29 entry:
  30   callbr void asm sideeffect "", "!i"()
  31   to label %bb2 [label %bb1]
  32
  33 bb1:
  34   ret void
  35
  36 bb2:
  37   ret void
  38 }
  39
  40 define void @callbr_can_fold_to_duplicate_dest2() {
  41 ; CHECK-LABEL: @callbr_can_fold_to_duplicate_dest2(
  42 ; CHECK-NEXT:  entry:
  43 ; CHECK-NEXT:    callbr void asm sideeffect "", "!i,!i"()
  44 ; CHECK-NEXT:            to label [[COMMON_RET:%.*]] [label [[COMMON_RET]], label %common.ret]
  45 ; CHECK:       common.ret:
  46 ; CHECK-NEXT:    ret void
  47 ;
  48 entry:
  49   callbr void asm sideeffect "", "!i,!i"()
  50   to label %bb1 [label %bb2, label %bb3]
  51
  52 bb1:
  53   ret void
  54
  55 bb2:
  56   ret void
  57
  58 bb3:
  59   ret void
  60 }
  61
  62 ; Validate that callbr landingpad intrinsics do not get merged (via the
  63 ; IntrNoMerge attribute).
  64 define i32 @callbr_landingpad_nomerge() {
  65 ; CHECK-LABEL: @callbr_landingpad_nomerge(
  66 ; CHECK-NEXT:  entry:
  67 ; CHECK-NEXT:    [[OUT:%.*]] = callbr i32 asm "# $0", "=r,!i"()
  68 ; CHECK-NEXT:            to label [[DIRECT:%.*]] [label %entry.indirect_crit_edge]
  69 ; CHECK:       entry.indirect_crit_edge:
  70 ; CHECK-NEXT:    [[TMP0:%.*]] = call i32 @llvm.callbr.landingpad.i32(i32 [[OUT]])
  71 ; CHECK-NEXT:    br label [[COMMON_RET:%.*]]
  72 ; CHECK:       direct:
  73 ; CHECK-NEXT:    [[OUT2:%.*]] = callbr i32 asm "# $0", "=r,!i"()
  74 ; CHECK-NEXT:            to label [[COMMON_RET]] [label %direct.indirect_crit_edge]
  75 ; CHECK:       direct.indirect_crit_edge:
  76 ; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @llvm.callbr.landingpad.i32(i32 [[OUT2]])
  77 ; CHECK-NEXT:    br label [[COMMON_RET]]
  78 ; CHECK:       common.ret:
  79 ; CHECK-NEXT:    [[COMMON_RET_OP:%.*]] = phi i32 [ 0, [[DIRECT]] ], [ [[TMP0]], [[ENTRY_INDIRECT_CRIT_EDGE:%.*]] ], [ [[TMP1]], [[DIRECT_INDIRECT_CRIT_EDGE:%.*]] ]
  80 ; CHECK-NEXT:    ret i32 [[COMMON_RET_OP]]
  81 ;
  82 entry:
  83   %out = callbr i32 asm "# $0", "=r,!i"()
  84   to label %direct [label %entry.indirect_crit_edge]
  85
  86 entry.indirect_crit_edge:
  87   %0 = call i32 @llvm.callbr.landingpad.i32(i32 %out)
  88   br label %indirect
  89
  90 direct:
  91   %out2 = callbr i32 asm "# $0", "=r,!i"()
  92   to label %direct2 [label %direct.indirect_crit_edge]
  93
  94 direct.indirect_crit_edge:
  95   %1 = call i32 @llvm.callbr.landingpad.i32(i32 %out2)
  96   br label %indirect
  97
  98 direct2:
  99   ret i32 0
 100
 101 indirect:
 102   %out3 = phi i32 [ %0, %entry.indirect_crit_edge ], [ %1, %direct.indirect_crit_edge ]
 103   ret i32 %out3
 104 }
 105
 106 declare i32 @llvm.callbr.landingpad.i32(i32)