| ; RUN: opt < %s -analyze -block-freq | FileCheck %s |
| ; RUN: opt < %s -passes='print<block-freq>' -disable-output 2>&1 | FileCheck %s |
| |
| declare void @g(i32 %x) |
| |
| ; CHECK-LABEL: Printing analysis {{.*}} for function 'branch_weight_0': |
| ; CHECK-NEXT: block-frequency-info: branch_weight_0 |
| define void @branch_weight_0(i32 %a) { |
| ; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]] |
| entry: |
| br label %for.body |
| |
| ; Check that we get 1 and a huge frequency instead of 0,3. |
| ; CHECK-NEXT: for.body: float = 2147483647.8, |
| for.body: |
| %i = phi i32 [ 0, %entry ], [ %inc, %for.body ] |
| call void @g(i32 %i) |
| %inc = add i32 %i, 1 |
| %cmp = icmp ugt i32 %inc, %a |
| br i1 %cmp, label %for.end, label %for.body, !prof !0 |
| |
| ; CHECK-NEXT: for.end: float = 1.0, int = [[ENTRY]] |
| for.end: |
| ret void |
| } |
| |
| !0 = !{!"branch_weights", i32 0, i32 3} |
| |
| ; CHECK-LABEL: Printing analysis {{.*}} for function 'infinite_loop' |
| ; CHECK-NEXT: block-frequency-info: infinite_loop |
| define void @infinite_loop(i1 %x) { |
| ; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]] |
| entry: |
| br i1 %x, label %for.body, label %for.end, !prof !1 |
| |
| ; Check that the infinite loop is arbitrarily scaled to max out at 4096, |
| ; giving 2048 here. |
| ; CHECK-NEXT: for.body: float = 2048.0, |
| for.body: |
| %i = phi i32 [ 0, %entry ], [ %inc, %for.body ] |
| call void @g(i32 %i) |
| %inc = add i32 %i, 1 |
| br label %for.body |
| |
| ; Check that the exit weight is half of entry, since half is lost in the |
| ; infinite loop above. |
| ; CHECK-NEXT: for.end: float = 0.5, |
| for.end: |
| ret void |
| } |
| |
| !1 = !{!"branch_weights", i32 1, i32 1} |