| ; RUN: opt < %s -passes=correlated-propagation -S | FileCheck %s |
| |
| ; Removed several cases from switch. |
| define i32 @switch1(i32 %s) { |
| ; CHECK-LABEL: @switch1( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[S:%.*]], 0 |
| ; CHECK-NEXT: br i1 [[CMP]], label [[NEGATIVE:%.*]], label [[OUT:%.*]] |
| ; |
| entry: |
| %cmp = icmp slt i32 %s, 0 |
| br i1 %cmp, label %negative, label %out |
| |
| negative: |
| ; CHECK: negative: |
| ; CHECK-NEXT: switch i32 [[S]], label [[OUT]] [ |
| ; CHECK-NEXT: i32 -2, label [[NEXT:%.*]] |
| ; CHECK-NEXT: i32 -1, label [[NEXT]] |
| switch i32 %s, label %out [ |
| i32 0, label %out |
| i32 1, label %out |
| i32 -1, label %next |
| i32 -2, label %next |
| i32 2, label %out |
| i32 3, label %out |
| ; CHECK-NEXT: !prof ![[MD0:[0-9]+]] |
| ], !prof !{!"branch_weights", i32 99, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6} |
| |
| out: |
| %p = phi i32 [ 1, %entry ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ] |
| ret i32 %p |
| |
| next: |
| %q = phi i32 [ 0, %negative ], [ 0, %negative ] |
| ret i32 %q |
| } |
| |
| ; Removed all cases from switch. |
| define i32 @switch2(i32 %s) { |
| ; CHECK-LABEL: @switch2( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[S:%.*]], 0 |
| ; CHECK-NEXT: br i1 [[CMP]], label [[POSITIVE:%.*]], label [[OUT:%.*]] |
| ; |
| entry: |
| %cmp = icmp sgt i32 %s, 0 |
| br i1 %cmp, label %positive, label %out |
| |
| positive: |
| switch i32 %s, label %out [ |
| i32 0, label %out |
| i32 -1, label %next |
| i32 -2, label %next |
| ], !prof !{!"branch_weights", i32 99, i32 1, i32 2, i32 3} |
| |
| out: |
| %p = phi i32 [ -1, %entry ], [ 1, %positive ], [ 1, %positive ] |
| ret i32 %p |
| |
| next: |
| %q = phi i32 [ 0, %positive ], [ 0, %positive ] |
| ret i32 %q |
| } |
| |
| ; Change switch into conditional branch. |
| define i32 @switch3(i32 %s) { |
| ; CHECK-LABEL: @switch3( |
| ; |
| entry: |
| %cmp = icmp sgt i32 %s, 0 |
| br i1 %cmp, label %positive, label %out |
| |
| positive: |
| ; CHECK: positive: |
| ; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 %s, 1 |
| ; CHECK-NEXT: br i1 [[CMP]], label [[NEXT:%.*]], label [[OUT:%.*]], !prof ![[MD1:[0-9]+]] |
| switch i32 %s, label %out [ |
| i32 1, label %next |
| i32 -1, label %next |
| i32 -2, label %next |
| ], !prof !{!"branch_weights", i32 99, i32 1, i32 2, i32 3} |
| |
| out: |
| %p = phi i32 [ -1, %entry ], [ 1, %positive ] |
| ret i32 %p |
| |
| next: |
| %q = phi i32 [ 0, %positive ], [ 0, %positive ], [ 0, %positive ] |
| ret i32 %q |
| } |
| |
| ; Removed all cases from switch. |
| define i32 @switch4(i32 %s) { |
| ; CHECK-LABEL: @switch4( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[S:%.*]], 0 |
| ; CHECK-NEXT: br i1 [[CMP]], label [[NEGATIVE:%.*]], label [[OUT:%.*]] |
| ; |
| entry: |
| %cmp = icmp slt i32 %s, 0 |
| br i1 %cmp, label %negative, label %out |
| |
| negative: |
| ; CHECK: negative: |
| ; CHECK-NEXT: br label %out |
| switch i32 %s, label %out [ |
| i32 0, label %out |
| i32 1, label %out |
| i32 2, label %out |
| i32 3, label %out |
| ], !prof !{!"branch_weights", i32 99, i32 1, i32 2, i32 3, i32 4} |
| |
| out: |
| %p = phi i32 [ 1, %entry ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ] |
| ret i32 %p |
| } |
| |
| ; CHECK: ![[MD0]] = !{!"branch_weights", i32 99, i32 4, i32 3} |
| ; CHECK: ![[MD1]] = !{!"branch_weights", i32 1, i32 99} |