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annotate src/build-msvctools/math/log1p.S @ 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
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1 /*
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2 * Written by J.T. Conklin <jtc@netbsd.org>.
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3 * Public domain.
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4 * Removed header file dependency for use in libmingwex.a by
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5 * Danny Smith <dannysmith@users.sourceforge.net>
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6 */
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7
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8 .file "log1p.S"
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9 .text
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10 .align 4
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11 /* The fyl2xp1 can only be used for values in
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12 -1 + sqrt(2) / 2 <= x <= 1 - sqrt(2) / 2
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13 0.29 is a safe value.
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14 */
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15 limit: .double 0.29
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16 one: .double 1.0
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17 /*
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18 * Use the fyl2xp1 function when the argument is in the range -0.29 to 0.29,
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19 * otherwise fyl2x with the needed extra computation.
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20 */
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21 .globl _log1p;
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22 .def _log1p; .scl 2; .type 32; .endef
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23 _log1p:
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24 fldln2
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25 fldl 4(%esp)
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26 fxam
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27 fnstsw
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28 fld %st
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29 sahf
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30 jc 3f /* in case x is NaN or �Inf */
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31
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32 4: fabs
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33 fcompl limit
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34 fnstsw
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35 sahf
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36 jc 2f
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37 faddl one
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38 fyl2x
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39 ret
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40
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41 2: fyl2xp1
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42 ret
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43
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44 3: jp 4b /* in case x is �Inf */
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45 fstp %st(1)
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46 fstp %st(1)
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47 ret