Rewrite fabs.S to use pure SSE2 operations. I got the clues how to do
this from looking at code generated by gcc.
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2020-12-20 02:59:44 +00:00
svn path=/head/; revision=125600
@ -1,18 +1,43 @@
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/*-
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* Copyright (c) 2004 Peter Wemm
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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#if defined(LIBC_SCCS)
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RCSID("$NetBSD: fabs.S,v 1.4 1997/07/16 14:37:16 christos Exp $")
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#endif
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__FBSDID("$FreeBSD$");
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/*
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* Ok, this sucks. Is there really no way to push an xmm register onto
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* the FP stack directly?
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* Return floating point absolute value of a double.
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*/
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.text
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ENTRY(fabs)
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movsd %xmm0, -8(%rsp)
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fldl -8(%rsp)
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fabs
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fstpl -8(%rsp)
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movsd -8(%rsp),%xmm0
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movsd %xmm0, %xmm1
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movsd signbit(%rip), %xmm0
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andnpd %xmm1, %xmm0
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ret
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.data
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signbit:
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.quad 0x8000000000000000
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