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Added SDL_nextafter() and SDL_nextafterf()
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| #include "SDL_internal.h" | ||
| /* | ||
| * ==================================================== | ||
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. | ||
| * | ||
| * Developed at SunPro, a Sun Microsystems, Inc. business. | ||
| * Permission to use, copy, modify, and distribute this | ||
| * software is freely granted, provided that this notice | ||
| * is preserved. | ||
| * ==================================================== | ||
| */ | ||
|
|
||
| /* IEEE functions | ||
| * nextafter(x,y) | ||
| * return the next machine floating-point number of x in the | ||
| * direction toward y. | ||
| * Special cases: | ||
| */ | ||
|
|
||
| #include "math.h" | ||
| #include "math_private.h" | ||
|
|
||
| double nextafter(double x, double y) | ||
| { | ||
| int32_t hx,hy,ix,iy; | ||
| u_int32_t lx,ly; | ||
|
|
||
| EXTRACT_WORDS(hx,lx,x); | ||
| EXTRACT_WORDS(hy,ly,y); | ||
| ix = hx&0x7fffffff; /* |x| */ | ||
| iy = hy&0x7fffffff; /* |y| */ | ||
|
|
||
| if(((ix>=0x7ff00000)&&((ix-0x7ff00000)|lx)!=0) || /* x is nan */ | ||
| ((iy>=0x7ff00000)&&((iy-0x7ff00000)|ly)!=0)) /* y is nan */ | ||
| return x+y; | ||
| if(x==y) return y; /* x=y, return y */ | ||
| if((ix|lx)==0) { /* x == 0 */ | ||
| INSERT_WORDS(x,hy&0x80000000,1); /* return +-minsubnormal */ | ||
| y = x*x; | ||
| if(y==x) return y; else return x; /* raise underflow flag */ | ||
| } | ||
| if(hx>=0) { /* x > 0 */ | ||
| if(hx>hy||((hx==hy)&&(lx>ly))) { /* x > y, x -= ulp */ | ||
| if(lx==0) hx -= 1; | ||
| lx -= 1; | ||
| } else { /* x < y, x += ulp */ | ||
| lx += 1; | ||
| if(lx==0) hx += 1; | ||
| } | ||
| } else { /* x < 0 */ | ||
| if(hy>=0||hx>hy||((hx==hy)&&(lx>ly))){/* x < y, x -= ulp */ | ||
| if(lx==0) hx -= 1; | ||
| lx -= 1; | ||
| } else { /* x > y, x += ulp */ | ||
| lx += 1; | ||
| if(lx==0) hx += 1; | ||
| } | ||
| } | ||
| hy = hx&0x7ff00000; | ||
| if(hy>=0x7ff00000) return x+x; /* overflow */ | ||
| if(hy<0x00100000) { /* underflow */ | ||
| y = x*x; | ||
| if(y!=x) { /* raise underflow flag */ | ||
| INSERT_WORDS(y,hx,lx); | ||
| return y; | ||
| } | ||
| } | ||
| INSERT_WORDS(x,hx,lx); | ||
| return x; | ||
| } | ||
| libm_hidden_def(nextafter) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| #include "SDL_internal.h" | ||
| /* s_nextafterf.c -- float version of s_nextafter.c. | ||
| * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. | ||
| */ | ||
|
|
||
| /* | ||
| * ==================================================== | ||
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. | ||
| * | ||
| * Developed at SunPro, a Sun Microsystems, Inc. business. | ||
| * Permission to use, copy, modify, and distribute this | ||
| * software is freely granted, provided that this notice | ||
| * is preserved. | ||
| * ==================================================== | ||
| */ | ||
|
|
||
| #include "math.h" | ||
| #include "math_private.h" | ||
|
|
||
| float nextafterf(float x, float y) | ||
| { | ||
| int32_t hx, hy, ix, iy; | ||
|
|
||
| GET_FLOAT_WORD(hx, x); | ||
| GET_FLOAT_WORD(hy, y); | ||
| ix = hx & 0x7fffffff; /* |x| */ | ||
| iy = hy & 0x7fffffff; /* |y| */ | ||
|
|
||
| /* x is nan or y is nan? */ | ||
| if ((ix > 0x7f800000) || (iy > 0x7f800000)) | ||
| return x + y; | ||
|
|
||
| if (x == y) | ||
| return y; | ||
|
|
||
| if (ix == 0) { /* x == 0? */ | ||
| /* glibc 2.4 does not seem to set underflow? */ | ||
| /* float u; */ | ||
| /* return +-minsubnormal */ | ||
| SET_FLOAT_WORD(x, (hy & 0x80000000) | 1); | ||
| /* u = x * x; raise underflow flag */ | ||
| /* math_force_eval(u); */ | ||
| return x; | ||
| } | ||
|
|
||
| if (hx >= 0) { /* x > 0 */ | ||
| if (hx > hy) { /* x > y: x -= ulp */ | ||
| hx -= 1; | ||
| } else { /* x < y: x += ulp */ | ||
| hx += 1; | ||
| } | ||
| } else { /* x < 0 */ | ||
| if (hy >= 0 || hx > hy) { /* x < y: x -= ulp */ | ||
| hx -= 1; | ||
| } else { /* x > y: x += ulp */ | ||
| hx += 1; | ||
| } | ||
| } | ||
| hy = hx & 0x7f800000; | ||
| if (hy >= 0x7f800000) { | ||
| x = x + x; /* overflow */ | ||
| return x; /* overflow */ | ||
| } | ||
| if (hy < 0x00800000) { | ||
| float u = x * x; /* underflow */ | ||
| math_force_eval(u); /* raise underflow flag */ | ||
| } | ||
| SET_FLOAT_WORD(x, hx); | ||
| return x; | ||
| } | ||
|
|
||
| #if 0 | ||
| /* "testprog N a b" | ||
| * calculates a = nextafterf(a, b) and prints a as float | ||
| * and as raw bytes; repeats it N times. | ||
| */ | ||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <math.h> | ||
| int main(int argc, char **argv) | ||
| { | ||
| int cnt, i; | ||
| float a, b; | ||
| cnt = atoi(argv[1]); | ||
| a = strtod(argv[2], NULL); | ||
| b = strtod(argv[3], NULL); | ||
| while (cnt-- > 0) { | ||
| for (i = 0; i < sizeof(a); i++) { | ||
| unsigned char c = ((char*)(&a))[i]; | ||
| printf("%x%x", (c >> 4), (c & 0xf)); | ||
| } | ||
| printf(" %f\n", a); | ||
| a = nextafterf(a, b); | ||
| } | ||
| return 0; | ||
| } | ||
| #endif |
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