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Currently the loop branch heuristic is applied before the invoke heuristic which makes us overestimate the probability of the unwind destination of invokes inside loops. This in turn makes us grossly underestimate the frequencies of loops with invokes. Reviewed By: skatkov, vsk Differential Revision: https://reviews.llvm.org/D47371 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334285 91177308-0d34-0410-b5e6-96231b3b80d8
36 lines
970 B
LLVM
36 lines
970 B
LLVM
; RUN: opt < %s -analyze -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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; CHECK-LABEL: Printing analysis {{.*}} for function 'loop_with_invoke':
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; CHECK-NEXT: block-frequency-info: loop_with_invoke
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define void @loop_with_invoke(i32 %n) personality i8 0 {
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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 %loop
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; CHECK-NEXT: loop: float = 9905.6
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loop:
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%i = phi i32 [ 0, %entry ], [ %i.next, %invoke.cont ]
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invoke void @foo() to label %invoke.cont unwind label %lpad
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; CHECK-NEXT: invoke.cont: float = 9905.6
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invoke.cont:
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%i.next = add i32 %i, 1
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%cont = icmp ult i32 %i.next, %n
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br i1 %cont, label %loop, label %exit, !prof !0
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; CHECK-NEXT: lpad: float = 0.0094467
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lpad:
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%ll = landingpad { i8*, i32 }
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cleanup
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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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ret void
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}
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declare void @foo()
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!0 = !{!"branch_weights", i32 9999, i32 1}
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