ARM/libroot: Some last fp bits-n-pieces
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@ -34,11 +34,12 @@ local genericSources =
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s_isnan.c s_isnanf.c
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s_isnan.c s_isnanf.c
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s_signbit.c s_signbitf.c s_signbitl.c
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s_signbit.c s_signbitf.c s_signbitl.c
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s_floor.c
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s_floor.c s_floorf.c
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s_ceil.c s_ceilf.c
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s_ceil.c s_ceilf.c
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s_modf.c
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s_modf.c
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w_pow.c e_pow.c slowpow.c
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w_pow.c e_pow.c slowpow.c
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e_exp.c slowexp.c
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w_exp.c e_exp.c slowexp.c
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s_frexp.c s_expm1.c
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dosincos.c
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dosincos.c
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doasin.c
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doasin.c
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sincos32.c
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sincos32.c
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@ -51,10 +52,15 @@ local genericSources =
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e_asin.c w_asin.c
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e_asin.c w_asin.c
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e_log10.c w_log10.c
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e_log10.c w_log10.c
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e_acos.c w_acos.c
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e_acos.c w_acos.c
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e_atan2.c w_atan2.c mpatan2.c mpatan.c mptan.c mpsqrt.c
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e_atan2.c w_atan2.c mpatan2.c mpatan.c mptan.c mpsqrt.c w_sqrt.c w_sqrtf.c
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e_fmod.c w_fmod.c
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e_fmod.c w_fmod.c
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e_log.c w_log.c
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e_log.c w_log.c
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e_cosh.c w_cosh.c
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e_sinh.c w_sinh.c
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s_ldexp.c s_ldexpf.c
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s_ldexp.c s_ldexpf.c
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s_scalbnf.c s_scalbn.c
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s_copysign.c
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s_tanh.c
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;
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;
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MergeObject posix_gnu_arch_$(TARGET_ARCH)_generic.o :
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MergeObject posix_gnu_arch_$(TARGET_ARCH)_generic.o :
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@ -63,6 +69,7 @@ MergeObject posix_gnu_arch_$(TARGET_ARCH)_generic.o :
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MergeObject posix_gnu_arch_$(TARGET_ARCH)_others.o :
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MergeObject posix_gnu_arch_$(TARGET_ARCH)_others.o :
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e_sqrt.c
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e_sqrt.c
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e_sqrtf.c
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;
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;
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MergeObjectFromObjects posix_gnu_arch_$(TARGET_ARCH).o : :
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MergeObjectFromObjects posix_gnu_arch_$(TARGET_ARCH).o : :
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@ -0,0 +1,97 @@
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/* e_sqrtf.c -- float version of e_sqrt.c.
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#if defined(LIBM_SCCS) && !defined(lint)
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static char rcsid[] = "$NetBSD: e_sqrtf.c,v 1.4 1995/05/10 20:46:19 jtc Exp $";
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#endif
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#include "math.h"
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#include "math_private.h"
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#ifdef __STDC__
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static const float one = 1.0, tiny=1.0e-30;
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#else
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static float one = 1.0, tiny=1.0e-30;
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#endif
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#ifdef __STDC__
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float __ieee754_sqrtf(float x)
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#else
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float __ieee754_sqrtf(x)
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float x;
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#endif
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{
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float z;
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int32_t sign = (int)0x80000000;
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int32_t ix,s,q,m,t,i;
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u_int32_t r;
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GET_FLOAT_WORD(ix,x);
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/* take care of Inf and NaN */
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if((ix&0x7f800000)==0x7f800000) {
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return x*x+x; /* sqrt(NaN)=NaN, sqrt(+inf)=+inf
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sqrt(-inf)=sNaN */
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}
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/* take care of zero */
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if(ix<=0) {
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if((ix&(~sign))==0) return x;/* sqrt(+-0) = +-0 */
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else if(ix<0)
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return (x-x)/(x-x); /* sqrt(-ve) = sNaN */
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}
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/* normalize x */
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m = (ix>>23);
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if(m==0) { /* subnormal x */
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for(i=0;(ix&0x00800000)==0;i++) ix<<=1;
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m -= i-1;
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}
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m -= 127; /* unbias exponent */
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ix = (ix&0x007fffff)|0x00800000;
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if(m&1) /* odd m, double x to make it even */
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ix += ix;
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m >>= 1; /* m = [m/2] */
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/* generate sqrt(x) bit by bit */
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ix += ix;
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q = s = 0; /* q = sqrt(x) */
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r = 0x01000000; /* r = moving bit from right to left */
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while(r!=0) {
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t = s+r;
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if(t<=ix) {
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s = t+r;
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ix -= t;
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q += r;
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}
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ix += ix;
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r>>=1;
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}
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/* use floating add to find out rounding direction */
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if(ix!=0) {
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z = one-tiny; /* trigger inexact flag */
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if (z>=one) {
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z = one+tiny;
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if (z>one)
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q += 2;
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else
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q += (q&1);
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}
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}
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ix = (q>>1)+0x3f000000;
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ix += (m <<23);
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SET_FLOAT_WORD(z,ix);
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return z;
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}
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