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comparison src/build-msvctools/math/modff.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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3060:cbdf4575016d 3061:f8299bb6c872
1 #include <fenv.h>
2 #include <math.h>
3 #include <errno.h>
4 #define FE_ROUNDING_MASK \
5 (FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO)
6
7 float
8 modff (float value, float* iptr)
9 {
10 float int_part;
11 unsigned short saved_cw;
12 unsigned short tmp_cw;
13 /* truncate */
14 asm ("fnstcw %0;" : "=m" (saved_cw)); /* save control word */
15 tmp_cw = (saved_cw & ~FE_ROUNDING_MASK) | FE_TOWARDZERO;
16 asm ("fldcw %0;" : : "m" (tmp_cw));
17 asm ("frndint;" : "=t" (int_part) : "0" (value)); /* round */
18 asm ("fldcw %0;" : : "m" (saved_cw)); /* restore saved cw */
19 if (iptr)
20 *iptr = int_part;
21 return (isinf (value) ? 0.0F : value - int_part);
22 }