The branch stable/13 has been updated by arichardson: URL: https://cgit.FreeBSD.org/src/commit/?id=85e5714ec7952851e4232a8fc8354b37c6d94971
commit 85e5714ec7952851e4232a8fc8354b37c6d94971 Author: Alex Richardson <[email protected]> AuthorDate: 2021-02-25 14:29:44 +0000 Commit: Alex Richardson <[email protected]> CommitDate: 2021-04-22 09:42:19 +0000 Also use the musl scalbn code for ldexp() Instead of copying the code as 00646ca2047305fce32d99edc7a8e6dfd801f3b4 did, include the implementation with the function name re-defined. (cherry picked from commit aac21e66f94e0a8ad52c1f8cd8dce50fcdd35cca) --- lib/libc/gen/ldexp.c | 126 +++------------------------------------------------ 1 file changed, 6 insertions(+), 120 deletions(-) diff --git a/lib/libc/gen/ldexp.c b/lib/libc/gen/ldexp.c index 887f673ee9a5..878271576313 100644 --- a/lib/libc/gen/ldexp.c +++ b/lib/libc/gen/ldexp.c @@ -1,123 +1,9 @@ -/* @(#)s_scalbn.c 5.1 93/09/24 */ -/* @(#)fdlibm.h 5.1 93/09/24 */ -/* - * ==================================================== - * 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 <sys/cdefs.h> __FBSDID("$FreeBSD$"); -#include <sys/types.h> -#include <machine/endian.h> -#include <math.h> - -/* Bit fiddling routines copied from msun/src/math_private.h,v 1.15 */ - -#if BYTE_ORDER == BIG_ENDIAN - -typedef union -{ - double value; - struct - { - u_int32_t msw; - u_int32_t lsw; - } parts; -} ieee_double_shape_type; - -#endif - -#if BYTE_ORDER == LITTLE_ENDIAN - -typedef union -{ - double value; - struct - { - u_int32_t lsw; - u_int32_t msw; - } parts; -} ieee_double_shape_type; - -#endif - -/* Get two 32 bit ints from a double. */ - -#define EXTRACT_WORDS(ix0,ix1,d) \ -do { \ - ieee_double_shape_type ew_u; \ - ew_u.value = (d); \ - (ix0) = ew_u.parts.msw; \ - (ix1) = ew_u.parts.lsw; \ -} while (0) - -/* Get the more significant 32 bit int from a double. */ - -#define GET_HIGH_WORD(i,d) \ -do { \ - ieee_double_shape_type gh_u; \ - gh_u.value = (d); \ - (i) = gh_u.parts.msw; \ -} while (0) - -/* Set the more significant 32 bits of a double from an int. */ - -#define SET_HIGH_WORD(d,v) \ -do { \ - ieee_double_shape_type sh_u; \ - sh_u.value = (d); \ - sh_u.parts.msw = (v); \ - (d) = sh_u.value; \ -} while (0) - - -static const double -two54 = 1.80143985094819840000e+16, /* 0x43500000, 0x00000000 */ -twom54 = 5.55111512312578270212e-17, /* 0x3C900000, 0x00000000 */ -huge = 1.0e+300, -tiny = 1.0e-300; - -static double -_copysign(double x, double y) -{ - u_int32_t hx,hy; - GET_HIGH_WORD(hx,x); - GET_HIGH_WORD(hy,y); - SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000)); - return x; -} - -double -ldexp(double x, int n) -{ - int32_t k,hx,lx; - EXTRACT_WORDS(hx,lx,x); - k = (hx&0x7ff00000)>>20; /* extract exponent */ - if (k==0) { /* 0 or subnormal x */ - if ((lx|(hx&0x7fffffff))==0) return x; /* +-0 */ - x *= two54; - GET_HIGH_WORD(hx,x); - k = ((hx&0x7ff00000)>>20) - 54; - if (n< -50000) return tiny*x; /*underflow*/ - } - if (k==0x7ff) return x+x; /* NaN or Inf */ - k = k+n; - if (k > 0x7fe) return huge*_copysign(huge,x); /* overflow */ - if (k > 0) /* normal result */ - {SET_HIGH_WORD(x,(hx&0x800fffff)|(k<<20)); return x;} - if (k <= -54) { - if (n > 50000) /* in case integer overflow in n+k */ - return huge*_copysign(huge,x); /*overflow*/ - else return tiny*_copysign(tiny,x); /*underflow*/ - } - k += 54; /* subnormal result */ - SET_HIGH_WORD(x,(hx&0x800fffff)|(k<<20)); - return x*twom54; -} +/* + * ldexp() and scalbn() are defined to be identical, but ldexp() lives in libc + * for backwards compatibility. + */ +#define scalbn ldexp +#include "../../msun/src/s_scalbn.c" _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/dev-commits-src-all To unsubscribe, send any mail to "[email protected]"
