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annotate src/build-msvctools/math/isnan.c @ 3061:f8299bb6c872

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Initial support for native MSVC compilation. * add MSVC support files: compiler wrappers and support libraries * adapt libiconv to work with MSVC * adapt gettext to work with MSVC
author Michael Goffioul <michael.goffioul@gmail.com>
date Mon, 17 Jun 2013 22:43:11 -0400
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3061
f8299bb6c872 Initial support for native MSVC compilation.
Michael Goffioul <michael.goffioul@gmail.com>
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1 #include <math.h>
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2
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3 int
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4 __isnan (double _x)
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5 {
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6 unsigned short _sw;
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7 __asm__ ("fxam;"
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8 "fstsw %%ax": "=a" (_sw) : "t" (_x));
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9 return (_sw & (FP_NAN | FP_NORMAL | FP_INFINITE | FP_ZERO | FP_SUBNORMAL))
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10 == FP_NAN;
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11 }
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12
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13 #undef isnan
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14 int __attribute__ ((alias ("__isnan"))) isnan (double);