1; RUN: opt < %s -passes=correlated-propagation -S | FileCheck %s 2 3; Removed several cases from switch. 4define i32 @switch1(i32 %s) { 5; CHECK-LABEL: @switch1( 6; CHECK-NEXT: entry: 7; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[S:%.*]], 0 8; CHECK-NEXT: br i1 [[CMP]], label [[NEGATIVE:%.*]], label [[OUT:%.*]] 9; 10entry: 11 %cmp = icmp slt i32 %s, 0 12 br i1 %cmp, label %negative, label %out 13 14negative: 15; CHECK: negative: 16; CHECK-NEXT: switch i32 [[S]], label [[OUT]] [ 17; CHECK-NEXT: i32 -2, label [[NEXT:%.*]] 18; CHECK-NEXT: i32 -1, label [[NEXT]] 19 switch i32 %s, label %out [ 20 i32 0, label %out 21 i32 1, label %out 22 i32 -1, label %next 23 i32 -2, label %next 24 i32 2, label %out 25 i32 3, label %out 26; CHECK-NEXT: !prof ![[MD0:[0-9]+]] 27 ], !prof !{!"branch_weights", i32 99, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6} 28 29out: 30 %p = phi i32 [ 1, %entry ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ] 31 ret i32 %p 32 33next: 34 %q = phi i32 [ 0, %negative ], [ 0, %negative ] 35 ret i32 %q 36} 37 38; Removed all cases from switch. 39define i32 @switch2(i32 %s) { 40; CHECK-LABEL: @switch2( 41; CHECK-NEXT: entry: 42; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[S:%.*]], 0 43; CHECK-NEXT: br i1 [[CMP]], label [[POSITIVE:%.*]], label [[OUT:%.*]] 44; 45entry: 46 %cmp = icmp sgt i32 %s, 0 47 br i1 %cmp, label %positive, label %out 48 49positive: 50 switch i32 %s, label %out [ 51 i32 0, label %out 52 i32 -1, label %next 53 i32 -2, label %next 54 ], !prof !{!"branch_weights", i32 99, i32 1, i32 2, i32 3} 55 56out: 57 %p = phi i32 [ -1, %entry ], [ 1, %positive ], [ 1, %positive ] 58 ret i32 %p 59 60next: 61 %q = phi i32 [ 0, %positive ], [ 0, %positive ] 62 ret i32 %q 63} 64 65; Change switch into conditional branch. 66define i32 @switch3(i32 %s) { 67; CHECK-LABEL: @switch3( 68; 69entry: 70 %cmp = icmp sgt i32 %s, 0 71 br i1 %cmp, label %positive, label %out 72 73positive: 74; CHECK: positive: 75; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 %s, 1 76; CHECK-NEXT: br i1 [[CMP]], label [[NEXT:%.*]], label [[OUT:%.*]], !prof ![[MD1:[0-9]+]] 77 switch i32 %s, label %out [ 78 i32 1, label %next 79 i32 -1, label %next 80 i32 -2, label %next 81 ], !prof !{!"branch_weights", i32 99, i32 1, i32 2, i32 3} 82 83out: 84 %p = phi i32 [ -1, %entry ], [ 1, %positive ] 85 ret i32 %p 86 87next: 88 %q = phi i32 [ 0, %positive ], [ 0, %positive ], [ 0, %positive ] 89 ret i32 %q 90} 91 92; Removed all cases from switch. 93define i32 @switch4(i32 %s) { 94; CHECK-LABEL: @switch4( 95; CHECK-NEXT: entry: 96; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[S:%.*]], 0 97; CHECK-NEXT: br i1 [[CMP]], label [[NEGATIVE:%.*]], label [[OUT:%.*]] 98; 99entry: 100 %cmp = icmp slt i32 %s, 0 101 br i1 %cmp, label %negative, label %out 102 103negative: 104; CHECK: negative: 105; CHECK-NEXT: br label %out 106 switch i32 %s, label %out [ 107 i32 0, label %out 108 i32 1, label %out 109 i32 2, label %out 110 i32 3, label %out 111 ], !prof !{!"branch_weights", i32 99, i32 1, i32 2, i32 3, i32 4} 112 113out: 114 %p = phi i32 [ 1, %entry ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ] 115 ret i32 %p 116} 117 118; CHECK: ![[MD0]] = !{!"branch_weights", i32 99, i32 4, i32 3} 119; CHECK: ![[MD1]] = !{!"branch_weights", i32 1, i32 99} 120