[Bug target/101922] mips: illegal instruction at -O3 with -mmsa -mloongson-mmi

[xry111 at mengyan1223 dot wang via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101922

--- Comment #2 from Xi Ruoyao <xry111 at mengyan1223 dot wang> ---
A "legal" testcase w/o UB (and may have some usage in practice):

typedef __INT8_TYPE__ i8;
typedef __INT32_TYPE__ i32;

i8 d[16];

i32 f(i32 x) {
  int i;
  for (i = 0; i < 16; i++) {
    __INT32_TYPE__ t = (__INT32_TYPE__) d[i] >> 31;
    x &= t;
  }
  return x;
}