Home | History | Annotate | Download | only in InstCombine 
      1 ; RUN: opt < %s -instcombine -S | FileCheck %s
      2 
      3 ; Test an already canonical branch to make sure we don't flip those.
      4 define i32 @test0(i32 %X, i32 %Y) {
      5         %C = icmp eq i32 %X, %Y
      6         br i1 %C, label %T, label %F, !prof !0
      7 
      8 ; CHECK: @test0
      9 ; CHECK: %C = icmp eq i32 %X, %Y
     10 ; CHECK: br i1 %C, label %T, label %F
     11 
     12 T:
     13         ret i32 12
     14 F:
     15         ret i32 123
     16 }
     17 
     18 define i32 @test1(i32 %X, i32 %Y) {
     19         %C = icmp ne i32 %X, %Y
     20         br i1 %C, label %T, label %F, !prof !1
     21 
     22 ; CHECK: @test1
     23 ; CHECK: %C = icmp eq i32 %X, %Y
     24 ; CHECK: br i1 %C, label %F, label %T
     25 
     26 T:
     27         ret i32 12
     28 F:
     29         ret i32 123
     30 }
     31 
     32 define i32 @test2(i32 %X, i32 %Y) {
     33         %C = icmp ule i32 %X, %Y
     34         br i1 %C, label %T, label %F, !prof !2
     35 
     36 ; CHECK: @test2
     37 ; CHECK: %C = icmp ugt i32 %X, %Y
     38 ; CHECK: br i1 %C, label %F, label %T
     39 
     40 T:
     41         ret i32 12
     42 F:
     43         ret i32 123
     44 }
     45 
     46 define i32 @test3(i32 %X, i32 %Y) {
     47         %C = icmp uge i32 %X, %Y
     48         br i1 %C, label %T, label %F, !prof !3
     49 
     50 ; CHECK: @test3
     51 ; CHECK: %C = icmp ult i32 %X, %Y
     52 ; CHECK: br i1 %C, label %F, label %T
     53 
     54 T:
     55         ret i32 12
     56 F:
     57         ret i32 123
     58 }
     59 
     60 !0 = metadata !{metadata !"branch_weights", i32 1, i32 2}
     61 !1 = metadata !{metadata !"branch_weights", i32 3, i32 4}
     62 !2 = metadata !{metadata !"branch_weights", i32 5, i32 6}
     63 !3 = metadata !{metadata !"branch_weights", i32 7, i32 8}
     64 ; Base case shouldn't change.
     65 ; CHECK: !0 = {{.*}} i32 1, i32 2}
     66 ; Ensure that the branch metadata is reversed to match the reversals above.
     67 ; CHECK: !1 = {{.*}} i32 4, i32 3}
     68 ; CHECK: !2 = {{.*}} i32 6, i32 5}
     69 ; CHECK: !3 = {{.*}} i32 8, i32 7}
     70