diff options
Diffstat (limited to 'libm/i387/s_trunc.S')
| -rw-r--r-- | libm/i387/s_trunc.S | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/libm/i387/s_trunc.S b/libm/i387/s_trunc.S new file mode 100644 index 0000000..1d78e1c --- /dev/null +++ b/libm/i387/s_trunc.S @@ -0,0 +1,26 @@ +/* + * Based on code written by J.T. Conklin <jtc@NetBSD.org>. + * Public domain. + */ + +#include <machine/asm.h> +__FBSDID("$FreeBSD: src/lib/msun/i387/s_trunc.S,v 1.1 2005/04/16 21:12:55 das Exp $") + +ENTRY(trunc) + pushl %ebp + movl %esp,%ebp + subl $8,%esp + + fstcw -4(%ebp) /* store fpu control word */ + movw -4(%ebp),%dx + orw $0x0c00,%dx /* round towards -oo */ + movw %dx,-8(%ebp) + fldcw -8(%ebp) /* load modfied control word */ + + fldl 8(%ebp) /* round */ + frndint + + fldcw -4(%ebp) /* restore original control word */ + + leave + ret |