33 lines
1.0 KiB
C
33 lines
1.0 KiB
C
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/**
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* This file has no copyright assigned and is placed in the Public Domain.
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* This file is part of the mingw-w64 runtime package.
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* No warranty is given; refer to the file DISCLAIMER.PD within this package.
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*/
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#include <math.h>
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int
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__isnanl (long double _x)
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{
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#if defined(__x86_64__) || defined(_AMD64_)
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__mingw_fp_types_t ld;
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int xx, signexp;
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ld.ld = &_x;
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signexp = (ld.ldt->lh.sign_exponent & 0x7fff) << 1;
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xx = (int) (ld.ldt->lh.low | (ld.ldt->lh.high & 0x7fffffffu)); /* explicit */
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signexp |= (unsigned int) (xx | (-xx)) >> 31;
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signexp = 0xfffe - signexp;
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return (int) ((unsigned int) signexp) >> 16;
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#elif defined(__arm__) || defined(_ARM_) || defined(__aarch64__) || defined(_ARM64_)
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return __isnan(_x);
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#elif defined(__i386__) || defined(_X86_)
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unsigned short _sw;
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__asm__ __volatile__ ("fxam;"
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"fstsw %%ax": "=a" (_sw) : "t" (_x));
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return (_sw & (FP_NAN | FP_NORMAL | FP_INFINITE | FP_ZERO | FP_SUBNORMAL))
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== FP_NAN;
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#endif
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}
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int __attribute__ ((alias ("__isnanl"))) isnanl (long double);
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