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annotate src/build-msvctools/math/ilogb.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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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 */
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5
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6
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7 .file "ilogb.S"
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8 .text
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9 .align 4
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10 .globl _ilogb
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11 .def _ilogb; .scl 2; .type 32; .endef
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12 _ilogb:
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13
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14 fldl 4(%esp)
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15 /* I added the following ugly construct because ilogb(+-Inf) is
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16 required to return INT_MAX in ISO C99.
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17 -- jakub@redhat.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
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25 fxtract
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26 pushl %eax
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27 fstp %st
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28
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29 fistpl (%esp)
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30 fwait
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31 popl %eax
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32
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33 ret
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34
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35 1: fstp %st
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36 movl $0x7fffffff, %eax
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37 ret