https://bugs.llvm.org/show_bug.cgi?id=33880
Bug ID: 33880
Summary: clang hangs in
llvm::JumpThreadingPass::ComputeValueKnownInPredecesso
rs on a tiny input
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: k...@google.com
CC: llvm-bugs@lists.llvm.org, max.kazant...@azul.com
found with clang-proto-fuzzer on r308641.
clang -cc1 -triple x86_64-unknown-linux-gnu -O2 -emit-obj slow5.c
All time is spent in a recursive call to
llvm::JumpThreadingPass::ComputeValueKnownInPredecessors
void foo(int *a) {
while ((1 + 1)) {
while ((a[96] * a[96])) {
a[0] = (1024);
while (a[0]) {
while (a[0]) {
(void)0;
while ((a[96] * ((a[96] * a[96]) < 1))) {
a[96] = (1 + 1);
}
a[0] = (a[0] + a[0]);
}
}
}
}
}
(Not sure if this is related to https://bugs.llvm.org/show_bug.cgi?id=33753 or
https://bugs.llvm.org/show_bug.cgi?id=33494
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