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[PGO] Skip counter promotion for infinite loops

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Differential Revision: http://reviews.llvm.org/D40662

llvm-svn: 319462
This commit is contained in:
Xinliang David Li 2017-11-30 19:16:25 +00:00
parent f0ba71f375
commit c9f71e7ca6
2 changed files with 24 additions and 0 deletions
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3
lib/Transforms/Instrumentation/InstrProfiling.cpp
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@ -245,6 +245,9 @@ public:
} }
bool run(int64_t *NumPromoted) { bool run(int64_t *NumPromoted) {
// Skip 'infinite' loops:
if (ExitBlocks.size() == 0)
return false;
unsigned MaxProm = getMaxNumOfPromotionsInLoop(&L); unsigned MaxProm = getMaxNumOfPromotionsInLoop(&L);
if (MaxProm == 0) if (MaxProm == 0)
return false; return false;

21
test/Transforms/PGOProfile/infinite_loop.ll Normal file
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@ -0,0 +1,21 @@
; RUN: opt < %s -instrprof -S -o - -do-counter-promotion=1 | FileCheck %s
; CHECK: store
@__profn_foo = private constant [3 x i8] c"foo"
define void @foo() {
entry:
br label %while.body
while.body: ; preds = %entry, %while.body
call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__profn_foo, i32 0, i32 0), i64 14813359968, i32 1, i32 0)
call void (...) @bar() #2
br label %while.body
}
declare void @bar(...)
declare void @llvm.instrprof.increment(i8*, i64, i32, i32) #0
attributes #0 = { nounwind }