https://bugs.llvm.org/show_bug.cgi?id=47915
Bug ID: 47915
Summary: [LoopInterchange] Loops should not interchanged due to
dependencies
Product: libraries
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: chenge...@huawei.com
CC: llvm-bugs@lists.llvm.org
$ clang -mllvm -enable-loopinterchange -O2 reproducer.c -w && ./a.out
4096
0
4096
0
$ clang -O0 reproducer.c -w && ./a.out
4096
4096
4096
4096
reproducer.c:
#include <stdio.h>
int a;
int c[4][4];
*f = &a;
void test_deps() {
for (int i = 0; i <= 3; i++) {
for (int j = 0; j <= 3; j++) {
*f ^= 0x1000;
c[j][i] = *f;
}
}
}
main() {
test_deps();
for (int k = 0; k < 4; k++)
printf("%d\n", c[0][k]);
}
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