https://llvm.org/bugs/show_bug.cgi?id=27849
Bug ID: 27849
Summary: Incorrect call slot optimization in memcpyopt with
noalias
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 <cstdlib>
bool b = true;
__attribute((noinline))
void bar(int* x) { *x = 10; if (b) throw 0; }
__attribute((noinline))
void foo(int& __restrict x) {
int t;
bar(&t);
x = t;
}
int main() {
int x = 1;
try {
foo(x);
} catch (...) {}
if (x != 1) abort();
}
Works correctly with gcc and clang -O0; aborts with clang -O2.
Call slot optimization is being too aggressive in memcpyopt.
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