diff options
| -rw-r--r-- | win32/include/math.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/win32/include/math.h b/win32/include/math.h index 37a8ec4..5048ef9 100644 --- a/win32/include/math.h +++ b/win32/include/math.h @@ -597,6 +597,27 @@ extern "C" { return retval; } + #define FE_TONEAREST 0x0000 + #define FE_DOWNWARD 0x0400 + #define FE_UPWARD 0x0800 + #define FE_TOWARDZERO 0x0c00 + + __CRT_INLINE 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__ ("fldl %1;" + "frndint;" + "fstl %0;" : "=m" (retval) : "m" (_x)); /* round towards zero */ + __asm__ ("fldcw %0;" : : "m" (saved_cw) ); /* restore saved control word */ + return retval; + } + /* 7.12.9.6 */ /* round away from zero, regardless of fpu control word settings */ extern double __cdecl round (double); |