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88283451b2
Various implementations of frexp functions return sNaN for sNaN input. This patch fixes them to add such arguments to themselves so that qNaN is returned. Tested for x86_64, x86, mips64 and powerpc. [BZ #20250] * sysdeps/i386/fpu/s_frexpl.S (__frexpl): Add non-finite input to itself. * sysdeps/ieee754/dbl-64/s_frexp.c (__frexp): Add non-finite or zero input to itself. * sysdeps/ieee754/dbl-64/wordsize-64/s_frexp.c (__frexp): Likewise. * sysdeps/ieee754/flt-32/s_frexpf.c (__frexpf): Likewise. * sysdeps/ieee754/ldbl-128/s_frexpl.c (__frexpl): Likewise. * sysdeps/ieee754/ldbl-128ibm/s_frexpl.c (__frexpl): Likewise. * sysdeps/ieee754/ldbl-96/s_frexpl.c (__frexpl): Likewise. * math/libm-test.inc (frexp_test_data): Add sNaN tests.
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/* s_frexpf.c -- float version of s_frexp.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: s_frexpf.c,v 1.5 1995/05/10 20:47:26 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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static const float
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two25 = 3.3554432000e+07; /* 0x4c000000 */
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float __frexpf(float x, int *eptr)
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{
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int32_t hx,ix;
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GET_FLOAT_WORD(hx,x);
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ix = 0x7fffffff&hx;
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*eptr = 0;
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if(ix>=0x7f800000||(ix==0)) return x + x; /* 0,inf,nan */
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if (ix<0x00800000) { /* subnormal */
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x *= two25;
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GET_FLOAT_WORD(hx,x);
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ix = hx&0x7fffffff;
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*eptr = -25;
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}
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*eptr += (ix>>23)-126;
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hx = (hx&0x807fffff)|0x3f000000;
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SET_FLOAT_WORD(x,hx);
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return x;
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}
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weak_alias (__frexpf, frexpf)
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