projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| c6251f03 RM |
1 | /* Single precision version of nexttoward.c. |
| 2 | Conversion to IEEE single float by Jakub Jelinek, jj@ultra.linux.cz. */ | |
| 3 | /* | |
| 4 | * ==================================================== | |
| 5 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. | |
| 6 | * | |
| 7 | * Developed at SunPro, a Sun Microsystems, Inc. business. | |
| 8 | * Permission to use, copy, modify, and distribute this | |
| 9 | * software is freely granted, provided that this notice | |
| 10 | * is preserved. | |
| 11 | * ==================================================== | |
| 12 | */ | |
| 13 | ||
| 14 | /* IEEE functions | |
| 15 | * __nexttowardfd(x,y) | |
| 16 | * return the next machine floating-point number of x in the | |
| 17 | * direction toward y. | |
| 18 | * This is for machines which use different binary type for double and | |
| 19 | * long double conditionally, y is long double equal to double. | |
| 20 | * Special cases: | |
| 21 | */ | |
| 22 | ||
| 23 | #include <math_ldbl_opt.h> | |
| 24 | ||
| 25 | float __nldbl_nexttowardf(float x, double y); | |
| 26 | ||
| 27 | float __nldbl_nexttowardf(float x, double y) | |
| 28 | { | |
| 29 | int32_t hx,hy,ix,iy; | |
| 30 | u_int32_t ly; | |
| 31 | ||
| 32 | GET_FLOAT_WORD(hx,x); | |
| 33 | EXTRACT_WORDS(hy,ly,y); | |
| 34 | ix = hx&0x7fffffff; /* |x| */ | |
| 35 | iy = hy&0x7fffffff; /* |y| */ | |
| 36 | ||
| 37 | if((ix>0x7f800000) || /* x is nan */ | |
| 38 | ((iy>=0x7ff00000)&&((iy-0x7ff00000)|ly)!=0)) /* y is nan */ | |
| 39 | return x+y; | |
| 40 | if((double) x==y) return y; /* x=y, return y */ | |
| 41 | if(ix==0) { /* x == 0 */ | |
| 11bf311e | 42 | float x2; |
| c6251f03 | 43 | SET_FLOAT_WORD(x,(u_int32_t)(hy&0x80000000)|1);/* return +-minsub*/ |
| 11bf311e UD |
44 | x2 = x*x; |
| 45 | if(x2==x) return x2; else return x; /* raise underflow flag */ | |
| c6251f03 RM |
46 | } |
| 47 | if(hx>=0) { /* x > 0 */ | |
| 48 | if(hy<0||(ix>>23)>(iy>>20)-0x380 | |
| 49 | || ((ix>>23)==(iy>>20)-0x380 | |
| 50 | && (ix&0x7fffff)>(((hy<<3)|(ly>>29))&0x7fffff))) /* x > y, x -= ulp */ | |
| 51 | hx -= 1; | |
| 52 | else /* x < y, x += ulp */ | |
| 53 | hx += 1; | |
| 54 | } else { /* x < 0 */ | |
| 55 | if(hy>=0||(ix>>23)>(iy>>20)-0x380 | |
| 56 | || ((ix>>23)==(iy>>20)-0x380 | |
| 57 | && (ix&0x7fffff)>(((hy<<3)|(ly>>29))&0x7fffff))) /* x < y, x -= ulp */ | |
| 58 | hx -= 1; | |
| 59 | else /* x > y, x += ulp */ | |
| 60 | hx += 1; | |
| 61 | } | |
| 62 | hy = hx&0x7f800000; | |
| 11bf311e UD |
63 | if(hy>=0x7f800000) return x+x; /* overflow */ |
| 64 | if(hy<0x00800000) { /* underflow */ | |
| 65 | float x2 = x*x; | |
| 66 | if(x2!=x) { /* raise underflow flag */ | |
| 67 | SET_FLOAT_WORD(x2,hx); | |
| 68 | return x2; | |
| 69 | } | |
| c6251f03 RM |
70 | } |
| 71 | SET_FLOAT_WORD(x,hx); | |
| 72 | return x; | |
| 73 | } | |
| 74 | ||
| 75 | #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1) | |
| 76 | compat_symbol (libm, __nldbl_nexttowardf, nexttowardf, GLIBC_2_1); | |
| 77 | #endif |