diff options
| author | Theo de Raadt <deraadt@cvs.openbsd.org> | 2004-02-08 18:03:51 +0000 |
|---|---|---|
| committer | Theo de Raadt <deraadt@cvs.openbsd.org> | 2004-02-08 18:03:51 +0000 |
| commit | f9d4dbafe850675850558e2c8597b232b8be0e88 (patch) | |
| tree | c7db9cbea87fe13a78bd1aa5a591a820d663b9dc /lib/libm/arch/amd64/s_floorf.S | |
| parent | d1b83f8bb6e1bc54b2b16eace08563acb5e968a0 (diff) | |
add libm parts for amd64; much from netbsd, integration by mickey.
Instead of mixing the i387 & xmm register components, we decide to
explicitly seperate them. libm is already confusing enough as it is,
thank you very much
Diffstat (limited to 'lib/libm/arch/amd64/s_floorf.S')
| -rw-r--r-- | lib/libm/arch/amd64/s_floorf.S | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/lib/libm/arch/amd64/s_floorf.S b/lib/libm/arch/amd64/s_floorf.S new file mode 100644 index 00000000000..6a9dab0ca7c --- /dev/null +++ b/lib/libm/arch/amd64/s_floorf.S @@ -0,0 +1,43 @@ +/* + * Written by J.T. Conklin <jtc@NetBSD.org>. + * Public domain. + */ + +#include <machine/asm.h> + +RCSID("$NetBSD: s_floorf.S,v 1.6 2003/07/26 19:25:02 salo Exp $") + +ENTRY(floorf) +#ifdef __i386__ + pushl %ebp + movl %esp,%ebp + subl $8,%esp + + fstcw -4(%ebp) /* store fpu control word */ + movw -4(%ebp),%dx + orw $0x0400,%dx /* round towards -oo */ + andw $0xf7ff,%dx + movw %dx,-8(%ebp) + fldcw -8(%ebp) /* load modfied control word */ + + flds 8(%ebp); /* round */ + frndint + + fldcw -4(%ebp) /* restore original control word */ + + leave +#else + movss %xmm0, -4(%rsp) + fstcw -8(%rsp) + movw -8(%rsp),%dx + orw $0x0400,%dx + andw $0xf7ff,%dx + movw %dx,-12(%rsp) + fldcw -12(%rsp) + fldl -4(%rsp) + frndint + fldcw -8(%rsp) + fstpl -4(%rsp) + movss -4(%rsp),%xmm0 +#endif + ret |