vrd2_sincos: Two-valued double precision Sine and Cosine

• C Prototype:
  • void __vrd2_sincos(__m128d x, __m128d* S, __m128d* C));
  • Inputs:
    • __m128d x - the double precision input value pair.
  • Outputs:
    • (Sine of x and Cosine of x.)
    • __m128d *S - Pointer to the double precision Sine result pair.
    • __m128d *C - Pointer to the double precision Cosine result pair.
• Notes:
  • __vrd2_sincos computes the Sine and Cosine functions of two input arguments.
    
    This routine accepts a pair of double precision input values passed as a __m128d value. The result is the double precision Sin and Cosine of both values, returned as a __m128d value. This is a relaxed version of sincos, suitable for use with fastmath compiler flags or application

    not requiring full error handling. Denormal inputs may produce unpredictable results. Special case inputs produce C99 return values. The routine is accurate to better than 2 ulp over the valid input range.

• Special case return values:

  • Input	Output
    QNaN	same QNaN
    SNaN	same NaN converted to QNaN
    +infinity	QNaN
    -infinity	QNaN

• Performance:
  • 154 cycles for most valid inputs < 5e5 (77 cycles per Sine and Cosine of a value).