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annotate src/build-msvctools/math/exp2f.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 * Adapted for exp2 by Ulrich Drepper <drepper@cygnus.com>.
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4 * Public domain.
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5 */
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6
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7 .file "exp2f.S"
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8 .text
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9 .align 4
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10 .globl _exp2f
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11 .def _exp2f; .scl 2; .type 32; .endef
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12 _exp2f:
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13 flds 4(%esp)
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14 /* I added the following ugly construct because exp(+-Inf) resulted
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15 in NaN. The ugliness results from the bright minds at Intel.
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16 For the i686 the code can be written better.
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17 -- drepper@cygnus.com. */
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18 fxam /* Is NaN or +-Inf? */
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19 fstsw %ax
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20 movb $0x45, %dh
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21 andb %ah, %dh
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22 cmpb $0x05, %dh
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23 je 1f /* Is +-Inf, jump. */
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24 fld %st
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25 frndint /* int(x) */
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26 fsubr %st,%st(1) /* fract(x) */
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27 fxch
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28 f2xm1 /* 2^(fract(x)) - 1 */
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29 fld1
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30 faddp /* 2^(fract(x)) */
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31 fscale /* e^x */
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32 fstp %st(1)
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33 ret
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34
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35 1: testl $0x200, %eax /* Test sign. */
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36 jz 2f /* If positive, jump. */
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37 fstp %st
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38 fldz /* Set result to 0. */
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39 2: ret