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d8f619b393
This patch makes dbl-64 modf use libm_alias_double. Both the dbl-64 and dbl-64/wordsize-64 versions are changed, and the ldbl-opt version is changed to define the libc compat symbol only. Because of multiarch wrappers, the changed implementations are made not to define aliases at all if __modf is defined as a macro, as with other functions, so avoiding duplicate compat symbols while allowing those wrappers to be simplified. Tested for x86_64, and verified with build-many-glibcs.py that installed stripped shared libraries are unchanged by the patch. * sysdeps/ieee754/dbl-64/s_modf.c: Include <libm-alias-double.h>. (modf): Define using libm_alias_double, only if [!__modf]. * sysdeps/ieee754/dbl-64/wordsize-64/s_modf.c: Include <libm-alias-double.h>. (modf): Define using libm_alias_double, only if [!__modf]. * sysdeps/ieee754/ldbl-opt/s_modf.c (modfl): Only define libc compat symbol here. * sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_modf-ppc32.c (weak_alias): Do not undefine and redefine. (strong_alias): Likewise. * sysdeps/powerpc/powerpc64/fpu/multiarch/s_modf-ppc64.c (weak_alias): Likewise. (strong_alias): Likewise.
86 lines
2.0 KiB
C
86 lines
2.0 KiB
C
/*
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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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/*
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* modf(double x, double *iptr)
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* return fraction part of x, and return x's integral part in *iptr.
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* Method:
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* Bit twiddling.
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*
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* Exception:
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* No exception.
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*/
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#include <math.h>
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#include <math_private.h>
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#include <libm-alias-double.h>
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static const double one = 1.0;
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double
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__modf (double x, double *iptr)
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{
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int32_t i0, i1, j0;
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uint32_t i;
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EXTRACT_WORDS (i0, i1, x);
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j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; /* exponent of x */
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if (j0 < 20) /* integer part in high x */
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{
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if (j0 < 0) /* |x|<1 */
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{
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INSERT_WORDS (*iptr, i0 & 0x80000000, 0); /* *iptr = +-0 */
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return x;
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}
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else
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{
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i = (0x000fffff) >> j0;
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if (((i0 & i) | i1) == 0) /* x is integral */
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{
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*iptr = x;
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INSERT_WORDS (x, i0 & 0x80000000, 0); /* return +-0 */
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return x;
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}
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else
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{
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INSERT_WORDS (*iptr, i0 & (~i), 0);
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return x - *iptr;
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}
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}
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}
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else if (__glibc_unlikely (j0 > 51)) /* no fraction part */
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{
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*iptr = x * one;
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/* We must handle NaNs separately. */
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if (j0 == 0x400 && ((i0 & 0xfffff) | i1))
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return x * one;
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INSERT_WORDS (x, i0 & 0x80000000, 0); /* return +-0 */
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return x;
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}
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else /* fraction part in low x */
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{
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i = ((uint32_t) (0xffffffff)) >> (j0 - 20);
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if ((i1 & i) == 0) /* x is integral */
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{
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*iptr = x;
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INSERT_WORDS (x, i0 & 0x80000000, 0); /* return +-0 */
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return x;
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}
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else
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{
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INSERT_WORDS (*iptr, i0, i1 & (~i));
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return x - *iptr;
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}
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}
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}
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#ifndef __modf
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libm_alias_double (__modf, modf)
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#endif
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