1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s 3 4; a, b; 5; fn1() { 6; if (b) 7; if (a == 0 || a == 5) 8; return a; 9; return 0; 10; } 11 12; Checking that we handle correctly the case when we have a switch 13; branching multiple times to the same block 14 15@b = common global i32 0, align 4 16@a = common global i32 0, align 4 17 18; Function Attrs: nounwind 19define i32 @fn1() { 20; CHECK-LABEL: @fn1( 21; CHECK-NEXT: entry: 22; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr @b, align 4 23; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32 [[TMP0]], 0 24; CHECK-NEXT: br i1 [[TOBOOL]], label [[RETURN:%.*]], label [[IF_THEN:%.*]] 25; CHECK: if.then: 26; CHECK-NEXT: [[TMP1:%.*]] = load i32, ptr @a, align 4 27; CHECK-NEXT: [[SWITCH_SELECTCMP:%.*]] = icmp eq i32 [[TMP1]], 0 28; CHECK-NEXT: [[SWITCH_SELECT:%.*]] = select i1 [[SWITCH_SELECTCMP]], i32 0, i32 0 29; CHECK-NEXT: [[SWITCH_SELECTCMP1:%.*]] = icmp eq i32 [[TMP1]], 5 30; CHECK-NEXT: [[SWITCH_SELECT2:%.*]] = select i1 [[SWITCH_SELECTCMP1]], i32 5, i32 [[SWITCH_SELECT]] 31; CHECK-NEXT: br label [[RETURN]] 32; CHECK: return: 33; CHECK-NEXT: [[RETVAL_0:%.*]] = phi i32 [ [[SWITCH_SELECT2]], [[IF_THEN]] ], [ 0, [[ENTRY:%.*]] ] 34; CHECK-NEXT: ret i32 [[RETVAL_0]] 35; 36entry: 37 %0 = load i32, ptr @b, align 4 38 %tobool = icmp eq i32 %0, 0 39 br i1 %tobool, label %if.end3, label %if.then 40 41if.then: 42 %1 = load i32, ptr @a, align 4 43 switch i32 %1, label %if.end3 [ 44 i32 5, label %return 45 i32 0, label %return 46 ] 47 48if.end3: 49 br label %return 50 51return: 52 %retval.0 = phi i32 [ 0, %if.end3 ], [ %1, %if.then ], [ %1, %if.then ] 53 ret i32 %retval.0 54} 55 56