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annotate src/build-msvctools/math/acosh.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.
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1 #include <math.h>
f8299bb6c872 Initial support for native MSVC compilation.
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2 #include <errno.h>
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3 #include "fastmath.h"
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4
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5 /* acosh(x) = log (x + sqrt(x * x - 1)) */
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6 double acosh (double x)
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7 {
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8 if (isnan (x))
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9 return x;
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10
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11 if (x < 1.0)
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12 {
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13 errno = EDOM;
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14 return nan("");
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15 }
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16
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17 if (x > 0x1p32)
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18 /* Avoid overflow (and unnecessary calculation when
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19 sqrt (x * x - 1) == x). GCC optimizes by replacing
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20 the long double M_LN2 const with a fldln2 insn. */
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21 return __fast_log (x) + 6.9314718055994530941723E-1L;
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22
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23 /* Since x >= 1, the arg to log will always be greater than
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24 the fyl2xp1 limit (approx 0.29) so just use logl. */
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25 return __fast_log (x + __fast_sqrt((x + 1.0) * (x - 1.0)));
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26 }