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197dbda1a1
- math.h will use compiler builtin for gcc 4.4 when built without
-fsignaling-nans and the builtin is expanded inline for all
support architectures. As an example, there is no intra isnan
call on libm for the architecture I checked, x86, arm, aarch64,
and powerpc.
- The resulting binary difference on 32 bits architecture is minimum
for the non hotspot symbol.
- It helps wordsize-64 architectures that use ldbl-opt.
- It add some code simplification with reduction of duplicated
implementations.
Checked on powerpc-linux-gnu (built without --with-cpu, with
--with-cpu=power4 and with --with-cpu=power5+ and --disable-multi-arch),
powerpc64-linux-gnu (built without --with-cp and with --with-cpu=power5+
and --disable-multi-arch).
* sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c: Move to ...
* sysdeps/ieee754/dbl-64/s_isnan.c: ... here and format code.
Reviewed-by: Gabriel F. T. Gomes <gabrielftg@linux.ibm.com>
41 lines
1.0 KiB
C
41 lines
1.0 KiB
C
/* @(#)s_isnan.c 5.1 93/09/24 */
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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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/*
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* isnan(x) returns 1 is x is nan, else 0;
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* no branching!
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*/
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#include <math.h>
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#include <math_private.h>
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#include <ldbl-classify-compat.h>
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#include <shlib-compat.h>
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#include <stdint.h>
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int
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__isnan (double x)
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{
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int64_t hx;
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EXTRACT_WORDS64 (hx, x);
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hx &= UINT64_C (0x7fffffffffffffff);
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hx = UINT64_C (0x7ff0000000000000) - hx;
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return (int)(((uint64_t)hx)>>63);
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}
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hidden_def (__isnan)
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weak_alias (__isnan, isnan)
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#ifdef NO_LONG_DOUBLE
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# if LDBL_CLASSIFY_COMPAT && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23)
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compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
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# endif
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weak_alias (__isnan, isnanl)
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#endif
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