[Bug target/98927] Code using _mm_extract_epi16 compiles with -O3 but not on other optimization modes

[crazylht at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98927

Hongtao.liu <crazylht at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |crazylht at gmail dot com

--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---
The second parameter of _mm_extract_epi16 only accept constants, O3 didn't
report this error because the loop is completed unrolled, and the code to check
is in pass_expand, which is after tree unroll.

  _15 = VIEW_CONVERT_EXPR<vector(8) short int>(packed_8(D));
  _5 = __builtin_ia32_vec_ext_v8hi (_15, 0);
  _31 = __builtin_ia32_vec_ext_v8hi (_15, 1);
  _42 = __builtin_ia32_vec_ext_v8hi (_15, 2);
  _53 = __builtin_ia32_vec_ext_v8hi (_15, 3);
  _64 = __builtin_ia32_vec_ext_v8hi (_15, 4);
  _75 = __builtin_ia32_vec_ext_v8hi (_15, 5);
  _86 = __builtin_ia32_vec_ext_v8hi (_15, 6);
  _13 = __builtin_ia32_vec_ext_v8hi (_15, 7);