| /programs/develop/libraries/newlib/math/truncf.c |
|---|
| 0,0 → 1,17 |
| #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; |
| } |