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Inline __ieee754__rem_pio2(). With gcc4-2, this gives an average

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optimization of about 10% for cos(x), sin(x) and tan(x) on
|x| < 2**19*pi/2.  We didn't do this before because __ieee754__rem_pio2()
is too large and complicated for gcc-3.3 to inline very well.  We don't
do this for float precision because it interferes with optimization
of the usual (?) case (|x| < 9pi/4) which is manually inlined for float
precision only.

This has some rough edges:
- some static data is duplicated unnecessarily.  There isn't much after
  the recent move of large tables to k_rem_pio2.c, and some static data
  is duplicated to good affect (all the data static const, so that the
  compiler can evaluate expressions like 2*pio2 at compile time and
  generate even more static data for the constant for this).
- extern inline is used (for the same reason as in previous inlining of
  k_cosf.c etc.), but C99 apparently doesn't allow extern inline
  functions with static data, and gcc will eventually warn about this.

Convert to __FBSDID().

Indent __ieee754_rem_pio2()'s declaration consistently (its style was
made inconsistent with fdlibm a while ago, so complete this).

Fix __ieee754_rem_pio2()'s return type to match its prototype.  Someone
changed too many ints to int32_t's when fixing the assumption that all
ints are int32_t's.
This commit is contained in:
Bruce Evans 2008-02-18 14:02:12 +00:00
parent bd20049d27
commit 38662c9698
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=176385
4 changed files with 19 additions and 13 deletions
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11
lib/msun/src/e_rem_pio2.c
View File

@ -12,9 +12,8 @@
*
*/
#ifndef lint
static char rcsid[] = "$FreeBSD$";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/* __ieee754_rem_pio2(x,y)
*
@ -56,7 +55,11 @@ pio2_2t = 2.02226624879595063154e-21, /* 0x3BA3198A, 0x2E037073 */
pio2_3 = 2.02226624871116645580e-21, /* 0x3BA3198A, 0x2E000000 */
pio2_3t = 8.47842766036889956997e-32; /* 0x397B839A, 0x252049C1 */
int32_t __ieee754_rem_pio2(double x, double *y)
#ifdef INLINE_REM_PIO2
extern inline
#endif
int
__ieee754_rem_pio2(double x, double *y)
{
double z,w,t,r,fn;
double tx[3];

7
lib/msun/src/s_cos.c
View File

@ -10,9 +10,8 @@
* ====================================================
*/
#ifndef lint
static char rcsid[] = "$FreeBSD$";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/* cos(x)
* Return cosine function of x.
@ -48,7 +47,9 @@ static char rcsid[] = "$FreeBSD$";
#include <float.h>
#include "math.h"
#define INLINE_REM_PIO2
#include "math_private.h"
#include "e_rem_pio2.c"
double
cos(double x)

7
lib/msun/src/s_sin.c
View File

@ -10,9 +10,8 @@
* ====================================================
*/
#ifndef lint
static char rcsid[] = "$FreeBSD$";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/* sin(x)
* Return sine function of x.
@ -48,7 +47,9 @@ static char rcsid[] = "$FreeBSD$";
#include <float.h>
#include "math.h"
#define INLINE_REM_PIO2
#include "math_private.h"
#include "e_rem_pio2.c"
double
sin(double x)

7
lib/msun/src/s_tan.c
View File

@ -10,9 +10,8 @@
* ====================================================
*/
#ifndef lint
static char rcsid[] = "$FreeBSD$";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/* tan(x)
* Return tangent function of x.
@ -47,7 +46,9 @@ static char rcsid[] = "$FreeBSD$";
#include <float.h>
#include "math.h"
#define INLINE_REM_PIO2
#include "math_private.h"
#include "e_rem_pio2.c"
double
tan(double x)