forked from OSchip/llvm-project
51 lines
1.4 KiB
LLVM
51 lines
1.4 KiB
LLVM
; RUN: opt < %s -analyze -block-freq | FileCheck %s
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declare void @g(i32 %x)
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; CHECK-LABEL: Printing analysis {{.*}} for function 'branch_weight_0':
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; CHECK-NEXT: block-frequency-info: branch_weight_0
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define void @branch_weight_0(i32 %a) {
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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.body
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; Check that we get 1,4 instead of 0,3.
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; CHECK-NEXT: for.body: float = 4.0,
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for.body:
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%i = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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call void @g(i32 %i)
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%inc = add i32 %i, 1
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%cmp = icmp ugt i32 %inc, %a
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br i1 %cmp, label %for.end, label %for.body, !prof !0
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; CHECK-NEXT: for.end: float = 1.0, int = [[ENTRY]]
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for.end:
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ret void
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}
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!0 = metadata !{metadata !"branch_weights", i32 0, i32 3}
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; CHECK-LABEL: Printing analysis {{.*}} for function 'infinite_loop'
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; CHECK-NEXT: block-frequency-info: infinite_loop
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define void @infinite_loop(i1 %x) {
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; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]]
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entry:
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br i1 %x, label %for.body, label %for.end, !prof !1
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; Check that the loop scale maxes out at 4096, giving 2048 here.
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; CHECK-NEXT: for.body: float = 2048.0,
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for.body:
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%i = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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call void @g(i32 %i)
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%inc = add i32 %i, 1
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br label %for.body
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; Check that the exit weight is half of entry, since half is lost in the
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; infinite loop above.
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; CHECK-NEXT: for.end: float = 0.5,
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for.end:
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ret void
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}
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!1 = metadata !{metadata !"branch_weights", i32 1, i32 1}
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