[llvm-bugs] Issue 3821 in oss-fuzz: llvm/clang-proto-fuzzer: ASSERT: (isa<SCEVCouldNotCompute>(ExactNotTaken) || !isa<SCEVCouldNotCompute>(MaxNotTake

[k… via monorail via llvm-bugs]

Comment #2 on issue 3821 by kcc at google.com: llvm/clang-proto-fuzzer:  
ASSERT: (isa<SCEVCouldNotCompute>(ExactNotTaken) | 
| !isa<SCEVCouldNotCompute>(MaxNotTake
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=3821#c2

C repro:


void foo(int *a) {
while (((1+(1+a[0]))+1)){
}
while ((a[0]+a[32])){
a[0]=1;
}
while (((1/(1+a[0]))+1)){
a[0]=(a[0]+1);
}
}

  clang -cc1 -triple x86_64-unknown-linux-gnu -emit-obj  z.cc -O2

lib/Analysis/ScalarEvolution.cpp:6567:  
llvm::ScalarEvolution::ExitLimit::ExitLimit(const llvm::SCEV *, const  
llvm::SCEV *, bool, ArrayRef<const SmallPtrSetImpl<const  
llvm::SCEVPredicate *> *>): Assertion  
`(isa<SCEVCouldNotCompute>(ExactNotTaken) | 
| !isa<SCEVCouldNotCompute>(MaxNotTaken)) && "Exact is not allowed to be  
less precise than Max"' failed.


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