[Bug target/47617] SSE rounding mode works -g, not -O3

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47617

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |DUPLICATE

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-02-08 01:58:40 UTC ---
The problem is the same as recorded as PR 34678.  We are optimizing all the
_mm_cvtps_pi16 to one of them because we don't see the rounding mode has
changed.  To get the correct values each time do the following:

void test_rounding(void)
{
 __m128 source = {-1.1, 0.0, 1.1, 1.5};
 __m64 dest;
 unsigned int initial_mode;

 initial_mode = _MM_GET_ROUNDING_MODE();
 print_rounding_mode("initial rounding mode", initial_mode);

 /* now set the rounding mode to each value to see the result  */

 asm("":"+X"(source)); // force source to be different but the same
 _MM_SET_ROUNDING_MODE(_MM_ROUND_NEAREST);

 dest = _mm_cvtps_pi16(source);
 _mm_empty();
 print_round_results("with _MM_ROUND_NEAREST ", source, dest);

 asm("":"+X"(source)); // force source to be different but the same
 _MM_SET_ROUNDING_MODE(_MM_ROUND_DOWN);

 dest = _mm_cvtps_pi16(source);
 _mm_empty();
 print_round_results("with _MM_ROUND_DOWN ", source, dest);

 asm("":"+X"(source)); // force source to be different but the same
 _MM_SET_ROUNDING_MODE(_MM_ROUND_UP);

 dest = _mm_cvtps_pi16(source);
 _mm_empty();
 print_round_results("with _MM_ROUND_UP ", source, dest);

 asm("":"+X"(source)); // force source to be different but the same
 _MM_SET_ROUNDING_MODE(_MM_ROUND_TOWARD_ZERO);

 dest = _mm_cvtps_pi16(source);
 _mm_empty();
 print_round_results("with _MM_ROUND_TOWARD_ZERO ", source, dest);

 /* restore initial rounding mode  */
  _MM_SET_ROUNDING_MODE(initial_mode);

}

*** This bug has been marked as a duplicate of bug 34678 ***