https://llvm.org/bugs/show_bug.cgi?id=28189
Bug ID: 28189
Summary: DSE miscompile with TBAA
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
Artificial evil testcase:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int f(int* x, int *y) {
*x = 10;
int z = *y;
*(float*)x = 1.0;
return z;
}
int (*ff)(int*,int*) = f;
int main() {
void* x = malloc(4);
printf("%d\n", ff(x, x));
}
Should print 10; with clang -O2, prints 0. Tested on x86-64 Linux with trunk
clang.
DSE is incorrectly ignoring the load when it eliminates the store.
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
