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1a283409bc
When a loop gets bundled up, its outgoing edges are quite large, and can just barely overflow 64-bits. If one successor has multiple incoming edges -- and that successor is getting all the incoming mass -- combining just its edges can overflow. Handle that by saturating rather than asserting. This fixes PR21622. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223500 91177308-0d34-0410-b5e6-96231b3b80d8
41 lines
1.1 KiB
LLVM
41 lines
1.1 KiB
LLVM
; RUN: opt < %s -analyze -block-freq | FileCheck %s
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; PR21622: Check for a crasher when the sum of exits to the same successor of a
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; loop overflows.
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; CHECK-LABEL: Printing analysis {{.*}} for function 'extremely_likely_loop_successor':
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; CHECK-NEXT: block-frequency-info: extremely_likely_loop_successor
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define void @extremely_likely_loop_successor() {
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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 = 1.0,
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loop:
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%exit.1.cond = call i1 @foo()
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br i1 %exit.1.cond, label %exit, label %loop.2, !prof !0
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; CHECK-NEXT: loop.2: float = 0.0000000
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loop.2:
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%exit.2.cond = call i1 @foo()
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br i1 %exit.2.cond, label %exit, label %loop.3, !prof !0
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; CHECK-NEXT: loop.3: float = 0.0000000
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loop.3:
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%exit.3.cond = call i1 @foo()
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br i1 %exit.3.cond, label %exit, label %loop.4, !prof !0
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; CHECK-NEXT: loop.4: float = 0.0,
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loop.4:
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%exit.4.cond = call i1 @foo()
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br i1 %exit.4.cond, label %exit, label %loop, !prof !0
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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 i1 @foo()
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!0 = metadata !{metadata !"branch_weights", i32 4294967295, i32 1}
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