+++ /dev/null
-/* @(#)e_fmod.c 5.1 93/09/24 */\r
-/*\r
- * ====================================================\r
- * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.\r
- *\r
- * Developed at SunPro, a Sun Microsystems, Inc. business.\r
- * Permission to use, copy, modify, and distribute this\r
- * software is freely granted, provided that this notice\r
- * is preserved.\r
- * ====================================================\r
- */\r
-#include <LibConfig.h>\r
-#include <sys/EfiCdefs.h>\r
-#if defined(LIBM_SCCS) && !defined(lint)\r
-__RCSID("$NetBSD: e_fmod.c,v 1.11 2002/05/26 22:01:49 wiz Exp $");\r
-#endif\r
-\r
-/*\r
- * __ieee754_fmod(x,y)\r
- * Return x mod y in exact arithmetic\r
- * Method: shift and subtract\r
- */\r
-\r
-#include "math.h"\r
-#include "math_private.h"\r
-\r
-#if defined(_MSC_VER) /* Handle Microsoft VC++ compiler specifics. */\r
- // unary minus operator applied to unsigned type, result still unsigned\r
- #pragma warning ( disable : 4146 )\r
-#endif\r
-\r
-static const double one = 1.0, Zero[] = {0.0, -0.0,};\r
-\r
-double\r
-__ieee754_fmod(double x, double y)\r
-{\r
- int32_t n,hx,hy,hz,ix,iy,sx,i;\r
- u_int32_t lx,ly,lz;\r
-\r
- EXTRACT_WORDS(hx,lx,x);\r
- EXTRACT_WORDS(hy,ly,y);\r
- sx = hx&0x80000000; /* sign of x */\r
- hx ^=sx; /* |x| */\r
- hy &= 0x7fffffff; /* |y| */\r
-\r
- /* purge off exception values */\r
- if((hy|ly)==0||(hx>=0x7ff00000)|| /* y=0,or x not finite */\r
- ((hy|((ly|-ly)>>31))>0x7ff00000)) /* or y is NaN */\r
- return (x*y)/(x*y);\r
- if(hx<=hy) {\r
- if((hx<hy)||(lx<ly)) return x; /* |x|<|y| return x */\r
- if(lx==ly)\r
- return Zero[(u_int32_t)sx>>31]; /* |x|=|y| return x*0*/\r
- }\r
-\r
- /* determine ix = ilogb(x) */\r
- if(hx<0x00100000) { /* subnormal x */\r
- if(hx==0) {\r
- for (ix = -1043, i=lx; i>0; i<<=1) ix -=1;\r
- } else {\r
- for (ix = -1022,i=(hx<<11); i>0; i<<=1) ix -=1;\r
- }\r
- } else ix = (hx>>20)-1023;\r
-\r
- /* determine iy = ilogb(y) */\r
- if(hy<0x00100000) { /* subnormal y */\r
- if(hy==0) {\r
- for (iy = -1043, i=ly; i>0; i<<=1) iy -=1;\r
- } else {\r
- for (iy = -1022,i=(hy<<11); i>0; i<<=1) iy -=1;\r
- }\r
- } else iy = (hy>>20)-1023;\r
-\r
- /* set up {hx,lx}, {hy,ly} and align y to x */\r
- if(ix >= -1022)\r
- hx = 0x00100000|(0x000fffff&hx);\r
- else { /* subnormal x, shift x to normal */\r
- n = -1022-ix;\r
- if(n<=31) {\r
- hx = (hx<<n)|(lx>>(32-n));\r
- lx <<= n;\r
- } else {\r
- hx = lx<<(n-32);\r
- lx = 0;\r
- }\r
- }\r
- if(iy >= -1022)\r
- hy = 0x00100000|(0x000fffff&hy);\r
- else { /* subnormal y, shift y to normal */\r
- n = -1022-iy;\r
- if(n<=31) {\r
- hy = (hy<<n)|(ly>>(32-n));\r
- ly <<= n;\r
- } else {\r
- hy = ly<<(n-32);\r
- ly = 0;\r
- }\r
- }\r
-\r
- /* fix point fmod */\r
- n = ix - iy;\r
- while(n--) {\r
- hz=hx-hy;lz=lx-ly; if(lx<ly) hz -= 1;\r
- if(hz<0){hx = hx+hx+(lx>>31); lx = lx+lx;}\r
- else {\r
- if((hz|lz)==0) /* return sign(x)*0 */\r
- return Zero[(u_int32_t)sx>>31];\r
- hx = hz+hz+(lz>>31); lx = lz+lz;\r
- }\r
- }\r
- hz=hx-hy;lz=lx-ly; if(lx<ly) hz -= 1;\r
- if(hz>=0) {hx=hz;lx=lz;}\r
-\r
- /* convert back to floating value and restore the sign */\r
- if((hx|lx)==0) /* return sign(x)*0 */\r
- return Zero[(u_int32_t)sx>>31];\r
- while(hx<0x00100000) { /* normalize x */\r
- hx = hx+hx+(lx>>31); lx = lx+lx;\r
- iy -= 1;\r
- }\r
- if(iy>= -1022) { /* normalize output */\r
- hx = ((hx-0x00100000)|((iy+1023)<<20));\r
- INSERT_WORDS(x,hx|sx,lx);\r
- } else { /* subnormal output */\r
- n = -1022 - iy;\r
- if(n<=20) {\r
- lx = (lx>>n)|((u_int32_t)hx<<(32-n));\r
- hx >>= n;\r
- } else if (n<=31) {\r
- lx = (hx<<(32-n))|(lx>>n); hx = sx;\r
- } else {\r
- lx = hx>>(n-32); hx = sx;\r
- }\r
- INSERT_WORDS(x,hx|sx,lx);\r
- x *= one; /* create necessary signal */\r
- }\r
- return x; /* exact output */\r
-}\r
projects / mirror_edk2.git / blobdiff