diff options
Diffstat (limited to 'sysdeps/i386/fpu/s_floor.S')
| -rw-r--r-- | sysdeps/i386/fpu/s_floor.S | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/sysdeps/i386/fpu/s_floor.S b/sysdeps/i386/fpu/s_floor.S new file mode 100644 index 0000000000..20a8660424 --- /dev/null +++ b/sysdeps/i386/fpu/s_floor.S @@ -0,0 +1,32 @@ +/* + * Written by J.T. Conklin <jtc@netbsd.org>. + * Public domain. + */ + +#include <machine/asm.h> + +RCSID("$NetBSD: s_floor.S,v 1.4 1995/05/09 00:01:59 jtc Exp $") + +ENTRY(__floor) + fldl 4(%esp) + subl $8,%esp + + fstcw 4(%esp) /* store fpu control word */ + + /* We use here %edx although only the low 1 bits are defined. + But none of the operations should care and they are faster + than the 16 bit operations. */ + movl $0x400,%edx /* round towards -oo */ + orl 4(%esp),%edx + andl $0xf7ff,%edx + movl %edx,(%esp) + fldcw (%esp) /* load modified control word */ + + frndint /* round */ + + fldcw 4(%esp) /* restore original control word */ + + addl $8,%esp + ret +END (__floor) +weak_alias (__floor, floor) |