[Bug middle-end/33007] [4.3 Regression] Revision 127185 causes NINT to ICE

["hjl at lucon dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #5 from hjl at lucon dot org  2007-08-07 14:40 -------
There is a disconnect between middle-end and back-end. There are many
places in builtins.c with

  /* If argument is already integer valued, and we don't need to worry
     about setting errno, there's no need to perform rounding.  */
  if (! flag_errno_math && integer_valued_real_p (arg))

However, the x86 back-end doesn't have this info:

(define_expand "lround<SSEMODEF:mode><SSEMODEI24:mode>2"
  [(match_operand:SSEMODEI24 0 "nonimmediate_operand" "")
   (match_operand:SSEMODEF 1 "register_operand" "")]
  "SSE_FLOAT_MODE_P (<SSEMODEF:MODE>mode) && TARGET_SSE_MATH
   && ((<SSEMODEI24:MODE>mode != DImode) || TARGET_64BIT)
   && !flag_trapping_math && !flag_rounding_math
   && !optimize_size"
{
  ix86_expand_lround (operand0, operand1);
  DONE;
})

That is why it fails to expand.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33007