144 lines
4.1 KiB
LLVM
144 lines
4.1 KiB
LLVM
; RUN: opt < %s -analyze -block-freq | FileCheck %s
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; RUN: opt < %s -analyze -lazy-block-freq | FileCheck %s
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; RUN: opt < %s -passes='print<block-freq>' -disable-output 2>&1 | FileCheck %s
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define i32 @test1(i32 %i, i32* %a) {
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; CHECK-LABEL: Printing analysis {{.*}} for function 'test1':
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; CHECK-NEXT: block-frequency-info: test1
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; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]]
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entry:
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br label %body
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; Loop backedges are weighted and thus their bodies have a greater frequency.
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; CHECK-NEXT: body: float = 32.0,
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body:
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%iv = phi i32 [ 0, %entry ], [ %next, %body ]
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%base = phi i32 [ 0, %entry ], [ %sum, %body ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i32 %iv
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%0 = load i32, i32* %arrayidx
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%sum = add nsw i32 %0, %base
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%next = add i32 %iv, 1
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%exitcond = icmp eq i32 %next, %i
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br i1 %exitcond, label %exit, label %body
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; CHECK-NEXT: exit: float = 1.0, int = [[ENTRY]]
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exit:
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ret i32 %sum
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}
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define i32 @test2(i32 %i, i32 %a, i32 %b) {
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; CHECK-LABEL: Printing analysis {{.*}} for function 'test2':
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; CHECK-NEXT: block-frequency-info: test2
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; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]]
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entry:
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%cond = icmp ult i32 %i, 42
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br i1 %cond, label %then, label %else, !prof !0
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; The 'then' branch is predicted more likely via branch weight metadata.
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; CHECK-NEXT: then: float = 0.9411{{[0-9]*}},
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then:
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br label %exit
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; CHECK-NEXT: else: float = 0.05882{{[0-9]*}},
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else:
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br label %exit
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; CHECK-NEXT: exit: float = 1.0, int = [[ENTRY]]
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exit:
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%result = phi i32 [ %a, %then ], [ %b, %else ]
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ret i32 %result
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}
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!0 = !{!"branch_weights", i32 64, i32 4}
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define i32 @test3(i32 %i, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) {
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; CHECK-LABEL: Printing analysis {{.*}} for function 'test3':
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; CHECK-NEXT: block-frequency-info: test3
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; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]]
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entry:
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switch i32 %i, label %case_a [ i32 1, label %case_b
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i32 2, label %case_c
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i32 3, label %case_d
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i32 4, label %case_e ], !prof !1
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; CHECK-NEXT: case_a: float = 0.05,
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case_a:
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br label %exit
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; CHECK-NEXT: case_b: float = 0.05,
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case_b:
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br label %exit
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; The 'case_c' branch is predicted more likely via branch weight metadata.
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; CHECK-NEXT: case_c: float = 0.8,
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case_c:
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br label %exit
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; CHECK-NEXT: case_d: float = 0.05,
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case_d:
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br label %exit
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; CHECK-NEXT: case_e: float = 0.05,
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case_e:
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br label %exit
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; CHECK-NEXT: exit: float = 1.0, int = [[ENTRY]]
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exit:
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%result = phi i32 [ %a, %case_a ],
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[ %b, %case_b ],
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[ %c, %case_c ],
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[ %d, %case_d ],
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[ %e, %case_e ]
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ret i32 %result
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}
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!1 = !{!"branch_weights", i32 4, i32 4, i32 64, i32 4, i32 4}
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define void @nested_loops(i32 %a) {
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; CHECK-LABEL: Printing analysis {{.*}} for function 'nested_loops':
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; CHECK-NEXT: block-frequency-info: nested_loops
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; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]]
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entry:
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br label %for.cond1.preheader
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; CHECK-NEXT: for.cond1.preheader: float = 4001.0,
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for.cond1.preheader:
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%x.024 = phi i32 [ 0, %entry ], [ %inc12, %for.inc11 ]
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br label %for.cond4.preheader
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; CHECK-NEXT: for.cond4.preheader: float = 16007984.8,
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for.cond4.preheader:
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%y.023 = phi i32 [ 0, %for.cond1.preheader ], [ %inc9, %for.inc8 ]
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%add = add i32 %y.023, %x.024
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br label %for.body6
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; CHECK-NEXT: for.body6: float = 64047914563.9,
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for.body6:
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%z.022 = phi i32 [ 0, %for.cond4.preheader ], [ %inc, %for.body6 ]
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%add7 = add i32 %add, %z.022
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tail call void @g(i32 %add7)
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%inc = add i32 %z.022, 1
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%cmp5 = icmp ugt i32 %inc, %a
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br i1 %cmp5, label %for.inc8, label %for.body6, !prof !2
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; CHECK-NEXT: for.inc8: float = 16007984.8,
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for.inc8:
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%inc9 = add i32 %y.023, 1
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%cmp2 = icmp ugt i32 %inc9, %a
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br i1 %cmp2, label %for.inc11, label %for.cond4.preheader, !prof !2
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; CHECK-NEXT: for.inc11: float = 4001.0,
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for.inc11:
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%inc12 = add i32 %x.024, 1
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%cmp = icmp ugt i32 %inc12, %a
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br i1 %cmp, label %for.end13, label %for.cond1.preheader, !prof !2
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; CHECK-NEXT: for.end13: float = 1.0, int = [[ENTRY]]
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for.end13:
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ret void
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}
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declare void @g(i32)
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!2 = !{!"branch_weights", i32 1, i32 4000}
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