mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-30 02:09:41 +03:00
17 lines
540 B
C
17 lines
540 B
C
#include <fenv.h>
|
|
#include <math.h>
|
|
|
|
double
|
|
trunc (double _x){
|
|
double 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;
|
|
}
|