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