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Include s_sin.c in s_sincos.c 

Include the __sin and __cos functions as local static copies to allow
deper optimization of the functions.  This change shows an improvement
of about 17% in the min case and 12.5% in the mean case for the sincos
microbenchmark on x86_64.

	* sysdeps/ieee754/dbl-64/s_sin.c (__sin)[IN_SINCOS]: Mark function
	static and don't set or restore rounding.
	(__cos)[IN_SINCOS]: Likewise.
	* sysdeps/ieee754/dbl-64/s_sincos.c: Include s_sin.c.
	(__sincos): Set and restore rounding mode.  Remove check for infinite
	or NaN input.
This commit is contained in:
Siddhesh Poyarekar 2015-11-17 16:20:20 +05:30
parent b7665e5163
commit 463ac90dab
3 changed files with 26 additions and 18 deletions
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7
ChangeLog
View File

@ -1,5 +1,12 @@
2015-11-17 Siddhesh Poyarekar <siddhesh.poyarekar@linaro.org>
* sysdeps/ieee754/dbl-64/s_sin.c (__sin)[IN_SINCOS]: Mark function
static and don't set or restore rounding.
(__cos)[IN_SINCOS]: Likewise.
* sysdeps/ieee754/dbl-64/s_sincos.c: Include s_sin.c.
(__sincos): Set and restore rounding mode. Remove check for infinite
or NaN input.
* sysdeps/ieee754/dbl-64/s_sin.c: Remove redundant else clauses.
* benchtests/scripts/bench.py (_print_arg_data): Mark output variables

12
sysdeps/ieee754/dbl-64/s_sin.c
View File

@ -280,8 +280,12 @@ reduce_and_compute (double x, unsigned int k)
/* An ultimate sin routine. Given an IEEE double machine number x */
/* it computes the correctly rounded (to nearest) value of sin(x) */
/*******************************************************************/
#ifdef IN_SINCOS
static double
#else
double
SECTION
#endif
__sin (double x)
{
double xx, res, t, cor, y, s, c, sn, ssn, cs, ccs, xn, a, da, db, eps, xn1,
@ -290,7 +294,9 @@ __sin (double x)
int4 k, m, n;
double retval = 0;
#ifndef IN_SINCOS
SET_RESTORE_ROUND_53BIT (FE_TONEAREST);
#endif
u.x = x;
m = u.i[HIGH_HALF];
@ -512,8 +518,12 @@ __sin (double x)
/* it computes the correctly rounded (to nearest) value of cos(x) */
/*******************************************************************/
#ifdef IN_SINCOS
static double
#else
double
SECTION
#endif
__cos (double x)
{
double y, xx, res, t, cor, xn, a, da, db, eps, xn1,
@ -523,7 +533,9 @@ __cos (double x)
double retval = 0;
#ifndef IN_SINCOS
SET_RESTORE_ROUND_53BIT (FE_TONEAREST);
#endif
u.x = x;
m = u.i[HIGH_HALF];

25
sysdeps/ieee754/dbl-64/s_sincos.c
View File

@ -22,29 +22,18 @@
#include <math_private.h>
#define __sin __sin_local
#define __cos __cos_local
#define IN_SINCOS 1
#include "s_sin.c"
void
__sincos (double x, double *sinx, double *cosx)
{
int32_t ix;
SET_RESTORE_ROUND_53BIT (FE_TONEAREST);
/* High word of x. */
GET_HIGH_WORD (ix, x);
/* |x| ~< pi/4 */
ix &= 0x7fffffff;
if (ix >= 0x7ff00000)
{
/* sin(Inf or NaN) is NaN */
*sinx = *cosx = x - x;
if (isinf (x))
__set_errno (EDOM);
}
else
{
*sinx = __sin (x);
*cosx = __cos (x);
}
*sinx = __sin (x);
*cosx = __cos (x);
}
weak_alias (__sincos, sincos)
#ifdef NO_LONG_DOUBLE