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libm: rem_pio2: Reduce size of static array

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This array was of 32-bit values, but the entries were only ever
in the 0-255 range.  Convert to uint8_t.

Testing performed: The result of the sum-of-sin was unchanged
>>> import math; sum(math.sin(2.**i) for i in range(21))
1.42069
This commit is contained in:
Jeff Epler 2020-08-04 13:12:44 -05:00
parent d3fb6c96da
commit c0b32976e8
3 changed files with 5 additions and 5 deletions
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4
lib/libm/ef_rem_pio2.c
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@ -35,9 +35,9 @@
* Table of constants for 2/pi, 396 Hex digits (476 decimal) of 2/pi
*/
#ifdef __STDC__
static const __int32_t two_over_pi[] = {
static const __uint8_t two_over_pi[] = {
#else
static __int32_t two_over_pi[] = {
static __uint8_t two_over_pi[] = {
#endif
0xA2, 0xF9, 0x83, 0x6E, 0x4E, 0x44, 0x15, 0x29, 0xFC,
0x27, 0x57, 0xD1, 0xF5, 0x34, 0xDD, 0xC0, 0xDB, 0x62,

2
lib/libm/fdlibm.h
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@ -188,7 +188,7 @@ extern float __ieee754_scalbf __P((float,float));
extern float __kernel_sinf __P((float,float,int));
extern float __kernel_cosf __P((float,float));
extern float __kernel_tanf __P((float,float,int));
extern int __kernel_rem_pio2f __P((float*,float*,int,int,int,const __int32_t*));
extern int __kernel_rem_pio2f __P((float*,float*,int,int,int,const __uint8_t*));
/* A union which permits us to convert between a float and a 32 bit
int. */

4
lib/libm/kf_rem_pio2.c
View File

@ -62,10 +62,10 @@ two8 = 2.5600000000e+02, /* 0x43800000 */
twon8 = 3.9062500000e-03; /* 0x3b800000 */
#ifdef __STDC__
int __kernel_rem_pio2f(float *x, float *y, int e0, int nx, int prec, const __int32_t *ipio2)
int __kernel_rem_pio2f(float *x, float *y, int e0, int nx, int prec, const __uint8_t *ipio2)
#else
int __kernel_rem_pio2f(x,y,e0,nx,prec,ipio2)
float x[], y[]; int e0,nx,prec; __int32_t ipio2[];
float x[], y[]; int e0,nx,prec; __uint8_t ipio2[];
#endif
{
__int32_t jz,jx,jv,jp,jk,carry,n,iq[20],i,j,k,m,q0,ih;