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comparison src/build-msvctools/math/trunc.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
4 double
5 trunc (double _x){
6 double retval;
7 unsigned short saved_cw;
8 unsigned short tmp_cw;
9 __asm__ ("fnstcw %0;" : "=m" (saved_cw)); /* save FPU control word */
10 tmp_cw = (saved_cw & ~(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO))
11 | FE_TOWARDZERO;
12 __asm__ ("fldcw %0;" : : "m" (tmp_cw));
13 __asm__ ("frndint;" : "=t" (retval) : "0" (_x)); /* round towards zero */
14 __asm__ ("fldcw %0;" : : "m" (saved_cw) ); /* restore saved control word */
15 return retval;
16 }