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annotate 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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3061
f8299bb6c872 Initial support for native MSVC compilation.
Michael Goffioul <michael.goffioul@gmail.com>
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1 #include <fenv.h>
f8299bb6c872 Initial support for native MSVC compilation.
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2 #include <math.h>
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3
f8299bb6c872 Initial support for native MSVC compilation.
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4 double
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5 trunc (double _x){
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6 double retval;
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7 unsigned short saved_cw;
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8 unsigned short tmp_cw;
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9 __asm__ ("fnstcw %0;" : "=m" (saved_cw)); /* save FPU control word */
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10 tmp_cw = (saved_cw & ~(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO))
f8299bb6c872 Initial support for native MSVC compilation.
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11 | FE_TOWARDZERO;
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12 __asm__ ("fldcw %0;" : : "m" (tmp_cw));
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13 __asm__ ("frndint;" : "=t" (retval) : "0" (_x)); /* round towards zero */
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14 __asm__ ("fldcw %0;" : : "m" (saved_cw) ); /* restore saved control word */
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15 return retval;
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16 }