diff options
Diffstat (limited to 'lib/libc')
| -rw-r--r-- | lib/libc/amd64/gen/fabs.S | 45 |
1 files changed, 35 insertions, 10 deletions
diff --git a/lib/libc/amd64/gen/fabs.S b/lib/libc/amd64/gen/fabs.S index f344001..59cd910 100644 --- a/lib/libc/amd64/gen/fabs.S +++ b/lib/libc/amd64/gen/fabs.S @@ -1,18 +1,43 @@ +/*- + * Copyright (c) 2004 Peter Wemm + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + #include <machine/asm.h> -#if defined(LIBC_SCCS) - RCSID("$NetBSD: fabs.S,v 1.4 1997/07/16 14:37:16 christos Exp $") -#endif __FBSDID("$FreeBSD$"); /* - * Ok, this sucks. Is there really no way to push an xmm register onto - * the FP stack directly? + * Return floating point absolute value of a double. */ + .text ENTRY(fabs) - movsd %xmm0, -8(%rsp) - fldl -8(%rsp) - fabs - fstpl -8(%rsp) - movsd -8(%rsp),%xmm0 + movsd %xmm0, %xmm1 + movsd signbit(%rip), %xmm0 + andnpd %xmm1, %xmm0 ret + + .data +signbit: + .quad 0x8000000000000000 |
