From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libquadmath/math/scalbnq.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 libquadmath/math/scalbnq.c (limited to 'libquadmath/math/scalbnq.c') diff --git a/libquadmath/math/scalbnq.c b/libquadmath/math/scalbnq.c new file mode 100644 index 000000000..b7049a70e --- /dev/null +++ b/libquadmath/math/scalbnq.c @@ -0,0 +1,48 @@ +/* s_scalbnl.c -- long double version of s_scalbn.c. + * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz. + */ + +/* + * ==================================================== + * 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 "quadmath-imp.h" + +static const __float128 +two114 = 2.0769187434139310514121985316880384E+34Q, /* 0x4071000000000000, 0 */ +twom114 = 4.8148248609680896326399448564623183E-35Q, /* 0x3F8D000000000000, 0 */ +huge = 1.0E+4900Q, +tiny = 1.0E-4900Q; + +__float128 +scalbnq (__float128 x, int n) +{ + int64_t k,hx,lx; + GET_FLT128_WORDS64(hx,lx,x); + k = (hx>>48)&0x7fff; /* extract exponent */ + if (k==0) { /* 0 or subnormal x */ + if ((lx|(hx&0x7fffffffffffffffULL))==0) return x; /* +-0 */ + x *= two114; + GET_FLT128_MSW64(hx,x); + k = ((hx>>48)&0x7fff) - 114; + } + if (k==0x7fff) return x+x; /* NaN or Inf */ + k = k+n; + if (n> 50000 || k > 0x7ffe) + return huge*copysignq(huge,x); /* overflow */ + if (n< -50000) return tiny*copysignq(tiny,x); /*underflow*/ + if (k > 0) /* normal result */ + {SET_FLT128_MSW64(x,(hx&0x8000ffffffffffffULL)|(k<<48)); return x;} + if (k <= -114) + return tiny*copysignq(tiny,x); /*underflow*/ + k += 114; /* subnormal result */ + SET_FLT128_MSW64(x,(hx&0x8000ffffffffffffULL)|(k<<48)); + return x*twom114; +} -- cgit v1.2.3