newlib-cygwin/winsup/mingw/mingwex/math/truncf.c

18 lines
488 B
C

#include <fenv.h>
#include <math.h>
float
truncf (float _x){
float retval;
unsigned short saved_cw;
__asm__ ("fnstcw %0;": "=m" (saved_cw)); /* save FPU control word */
__asm__ ("fldcw %0;"
:
: "m" ((saved_cw & ~(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD
| FE_TOWARDZERO)) | FE_TOWARDZERO)
);
__asm__ ("frndint;" : "=t" (retval) : "0" (_x)); /* round towards zero */
__asm__ ("fldcw %0;" : : "m" (saved_cw) ); /* restore saved control word */
return retval;
}