Home | History | Annotate | Download | only in BlockFrequencyInfo
      1 ; RUN: opt < %s -analyze -block-freq | FileCheck %s
      2 
      3 define i32 @test1(i32 %i, i32* %a) {
      4 ; CHECK: Printing analysis {{.*}} for function 'test1'
      5 ; CHECK: entry = 1024
      6 entry:
      7   br label %body
      8 
      9 ; Loop backedges are weighted and thus their bodies have a greater frequency.
     10 ; CHECK: body = 31744
     11 body:
     12   %iv = phi i32 [ 0, %entry ], [ %next, %body ]
     13   %base = phi i32 [ 0, %entry ], [ %sum, %body ]
     14   %arrayidx = getelementptr inbounds i32* %a, i32 %iv
     15   %0 = load i32* %arrayidx
     16   %sum = add nsw i32 %0, %base
     17   %next = add i32 %iv, 1
     18   %exitcond = icmp eq i32 %next, %i
     19   br i1 %exitcond, label %exit, label %body
     20 
     21 ; CHECK: exit = 1024
     22 exit:
     23   ret i32 %sum
     24 }
     25 
     26 define i32 @test2(i32 %i, i32 %a, i32 %b) {
     27 ; CHECK: Printing analysis {{.*}} for function 'test2'
     28 ; CHECK: entry = 1024
     29 entry:
     30   %cond = icmp ult i32 %i, 42
     31   br i1 %cond, label %then, label %else, !prof !0
     32 
     33 ; The 'then' branch is predicted more likely via branch weight metadata.
     34 ; CHECK: then = 963
     35 then:
     36   br label %exit
     37 
     38 ; CHECK: else = 60
     39 else:
     40   br label %exit
     41 
     42 ; FIXME: It may be a bug that we don't sum back to 1024.
     43 ; CHECK: exit = 1023
     44 exit:
     45   %result = phi i32 [ %a, %then ], [ %b, %else ]
     46   ret i32 %result
     47 }
     48 
     49 !0 = metadata !{metadata !"branch_weights", i32 64, i32 4}
     50 
     51 define i32 @test3(i32 %i, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) {
     52 ; CHECK: Printing analysis {{.*}} for function 'test3'
     53 ; CHECK: entry = 1024
     54 entry:
     55   switch i32 %i, label %case_a [ i32 1, label %case_b
     56                                  i32 2, label %case_c
     57                                  i32 3, label %case_d
     58                                  i32 4, label %case_e ], !prof !1
     59 
     60 ; CHECK: case_a = 51
     61 case_a:
     62   br label %exit
     63 
     64 ; CHECK: case_b = 51
     65 case_b:
     66   br label %exit
     67 
     68 ; The 'case_c' branch is predicted more likely via branch weight metadata.
     69 ; CHECK: case_c = 819
     70 case_c:
     71   br label %exit
     72 
     73 ; CHECK: case_d = 51
     74 case_d:
     75   br label %exit
     76 
     77 ; CHECK: case_e = 51
     78 case_e:
     79   br label %exit
     80 
     81 ; FIXME: It may be a bug that we don't sum back to 1024.
     82 ; CHECK: exit = 1023
     83 exit:
     84   %result = phi i32 [ %a, %case_a ],
     85                     [ %b, %case_b ],
     86                     [ %c, %case_c ],
     87                     [ %d, %case_d ],
     88                     [ %e, %case_e ]
     89   ret i32 %result
     90 }
     91 
     92 !1 = metadata !{metadata !"branch_weights", i32 4, i32 4, i32 64, i32 4, i32 4}
     93