Mercurial > mxe-octave
view src/build-msvctools/math/truncf.c @ 3061:f8299bb6c872
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> |
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date | Mon, 17 Jun 2013 22:43:11 -0400 |
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#include <fenv.h> #include <math.h> float truncf (float _x) { float retval; unsigned short saved_cw; unsigned short tmp_cw; __asm__ ("fnstcw %0;" : "=m" (saved_cw)); /* save FPU control word */ tmp_cw = (saved_cw & ~(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO)) | FE_TOWARDZERO; __asm__ ("fldcw %0;" : : "m" (tmp_cw)); __asm__ ("frndint;" : "=t" (retval) : "0" (_x)); /* round towards zero */ __asm__ ("fldcw %0;" : : "m" (saved_cw) ); /* restore saved control word */ return retval; }