https://llvm.org/bugs/show_bug.cgi?id=27860
Bug ID: 27860
Summary: gvn miscompile with restrict and call to exit()
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: eli.fried...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Testcase:
#include <stdlib.h>
void f() { exit(0); }
void (*ff)() = f;
int r;
int g(int *__restrict x, int a) {
if (a) {
r = *x;
}
ff();
return *x;
}
int (*gg)(int *__restrict, int) = g;
int main() {
gg(0, 0);
}
Works with gcc and clang -O0, segfaults with clang -O2.
Load PRE is missing a check that the pointer is actually dereferenceable.
(Artificial testcase.)
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