https://llvm.org/bugs/show_bug.cgi?id=27858
Bug ID: 27858
Summary: mldst-motion miscompile with call to exit()
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Testcase:
#include <stdlib.h>
void f() { exit(1); }
void (*ff)() = f;
int r, s;
void g(int a, int*restrict p) {
if (a) {ff(); r = p[1]; }
else { s = p[1]; }
}
void (*gg)(int, int*restrict) = g;
int main() {
gg(1, 0);
}
Works with gcc or clang -O0, crashes with clang -O2.
Testcase:
#include <stdlib.h>
#include <stdio.h>
void f() { throw 1; }
void (*ff)() = f;
void f2() {}
void (*ff2)() = f2;
int r, s;
void g(int a, int*__restrict p) {
if (a) { ff2(); p[1] = 2; ff(); }
else { p[1] = 2; }
}
void (*gg)(int, int*restrict) = g;
int main() {
int a[2] = {0};
try {
gg(1, a);
} catch (...) {}
if (a[1] != 2) abort();
}
Works with gcc or clang -O0, aborts with clang -O2.
I think the problem is
MergedLoadStoreMotion::isLoadHoistBarrierInRange/isStoreSinkBarrierInRange; you
can't use alias analysis to prove that a pointer is valid.
(Artificial testcases.)
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