[clang]: The output result is incorrect after the speculative_load_hardening attribute is added.

[llongint]

cat test.c

#include <stdio.h>

__attribute__((speculative_load_hardening))
int main() {
    unsigned char arr[] = {1,2,3,4,5,6};
    for (char i = 0;i < 6;i++)
        printf("%d", arr[i]);
    printf("\n");
    return 0;
}

$ clang -O0 -lpthread t2.c -o 15
$ ./15

No output is printed. Actually, 123456 should be printed.

Note: My machine is aarch64.

[llongint]

Clang 12 doesn't have this problem.

[llongint]

Fixed in https://reviews.llvm.org/D150527

[llvmbot]

@llvm/issue-subscribers-backend-aarch64