| ; RUN: opt < %s -analyze -block-freq | FileCheck %s |
| |
| define i32 @test1(i32 %i, i32* %a) { |
| ; CHECK: Printing analysis {{.*}} for function 'test1' |
| ; CHECK: entry = 1.0 |
| entry: |
| br label %body |
| |
| ; Loop backedges are weighted and thus their bodies have a greater frequency. |
| ; CHECK: body = 32.0 |
| body: |
| %iv = phi i32 [ 0, %entry ], [ %next, %body ] |
| %base = phi i32 [ 0, %entry ], [ %sum, %body ] |
| %arrayidx = getelementptr inbounds i32* %a, i32 %iv |
| %0 = load i32* %arrayidx |
| %sum = add nsw i32 %0, %base |
| %next = add i32 %iv, 1 |
| %exitcond = icmp eq i32 %next, %i |
| br i1 %exitcond, label %exit, label %body |
| |
| ; CHECK: exit = 1.0 |
| exit: |
| ret i32 %sum |
| } |
| |
| define i32 @test2(i32 %i, i32 %a, i32 %b) { |
| ; CHECK: Printing analysis {{.*}} for function 'test2' |
| ; CHECK: entry = 1.0 |
| entry: |
| %cond = icmp ult i32 %i, 42 |
| br i1 %cond, label %then, label %else, !prof !0 |
| |
| ; The 'then' branch is predicted more likely via branch weight metadata. |
| ; CHECK: then = 0.94116 |
| then: |
| br label %exit |
| |
| ; CHECK: else = 0.05877 |
| else: |
| br label %exit |
| |
| ; FIXME: It may be a bug that we don't sum back to 1.0. |
| ; CHECK: exit = 0.99993 |
| exit: |
| %result = phi i32 [ %a, %then ], [ %b, %else ] |
| ret i32 %result |
| } |
| |
| !0 = metadata !{metadata !"branch_weights", i32 64, i32 4} |
| |
| define i32 @test3(i32 %i, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) { |
| ; CHECK: Printing analysis {{.*}} for function 'test3' |
| ; CHECK: entry = 1.0 |
| entry: |
| switch i32 %i, label %case_a [ i32 1, label %case_b |
| i32 2, label %case_c |
| i32 3, label %case_d |
| i32 4, label %case_e ], !prof !1 |
| |
| ; CHECK: case_a = 0.04998 |
| case_a: |
| br label %exit |
| |
| ; CHECK: case_b = 0.04998 |
| case_b: |
| br label %exit |
| |
| ; The 'case_c' branch is predicted more likely via branch weight metadata. |
| ; CHECK: case_c = 0.79998 |
| case_c: |
| br label %exit |
| |
| ; CHECK: case_d = 0.04998 |
| case_d: |
| br label %exit |
| |
| ; CHECK: case_e = 0.04998 |
| case_e: |
| br label %exit |
| |
| ; FIXME: It may be a bug that we don't sum back to 1.0. |
| ; CHECK: exit = 0.99993 |
| exit: |
| %result = phi i32 [ %a, %case_a ], |
| [ %b, %case_b ], |
| [ %c, %case_c ], |
| [ %d, %case_d ], |
| [ %e, %case_e ] |
| ret i32 %result |
| } |
| |
| !1 = metadata !{metadata !"branch_weights", i32 4, i32 4, i32 64, i32 4, i32 4} |
| |
| ; CHECK: Printing analysis {{.*}} for function 'nested_loops' |
| ; CHECK: entry = 1.0 |
| ; This test doesn't seem to be assigning sensible frequencies to nested loops. |
| define void @nested_loops(i32 %a) { |
| entry: |
| br label %for.cond1.preheader |
| |
| for.cond1.preheader: |
| %x.024 = phi i32 [ 0, %entry ], [ %inc12, %for.inc11 ] |
| br label %for.cond4.preheader |
| |
| for.cond4.preheader: |
| %y.023 = phi i32 [ 0, %for.cond1.preheader ], [ %inc9, %for.inc8 ] |
| %add = add i32 %y.023, %x.024 |
| br label %for.body6 |
| |
| for.body6: |
| %z.022 = phi i32 [ 0, %for.cond4.preheader ], [ %inc, %for.body6 ] |
| %add7 = add i32 %add, %z.022 |
| tail call void @g(i32 %add7) #2 |
| %inc = add i32 %z.022, 1 |
| %cmp5 = icmp ugt i32 %inc, %a |
| br i1 %cmp5, label %for.inc8, label %for.body6, !prof !2 |
| |
| for.inc8: |
| %inc9 = add i32 %y.023, 1 |
| %cmp2 = icmp ugt i32 %inc9, %a |
| br i1 %cmp2, label %for.inc11, label %for.cond4.preheader, !prof !2 |
| |
| for.inc11: |
| %inc12 = add i32 %x.024, 1 |
| %cmp = icmp ugt i32 %inc12, %a |
| br i1 %cmp, label %for.end13, label %for.cond1.preheader, !prof !2 |
| |
| for.end13: |
| ret void |
| } |
| |
| declare void @g(i32) #1 |
| |
| !2 = metadata !{metadata !"branch_weights", i32 1, i32 4000} |