2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
81 lines
3 KiB
C
81 lines
3 KiB
C
/* $NetBSD: flt_rounds.c,v 1.4 2007/01/17 23:24:22 hubertf Exp $ */
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/*
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* Copyright (c) 1996 Mark Brinicombe
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Mark Brinicombe
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* for the NetBSD Project.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: flt_rounds.c,v 1.4 2007/01/17 23:24:22 hubertf Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <ieeefp.h>
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static const int map[] = {
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1, /* round to nearest */
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2, /* round to positive infinity */
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3, /* round to negative infinity */
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0 /* round to zero */
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};
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/*
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* Return the current FP rounding mode
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*
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* Returns:
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* 0 - round to zero
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* 1 - round to nearest
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* 2 - round to postive infinity
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* 3 - round to negative infinity
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*
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* ok all we need to do is get the current FP rounding mode
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* index our map table and return the appropriate value.
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*
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* HOWEVER:
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* The ARM FPA codes the rounding mode into the actual FP instructions
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* so there is no such thing as a global rounding mode.
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* The default is round to nearest if rounding is not explicitly specified.
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* FP instructions generated by GCC will not explicitly specify a rounding
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* mode.
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*
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* So the best we can do it to return the rounding mode FP instructions
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* use if rounding is not specified which is round to nearest.
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*
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* This could change in the future with new floating point emulators or
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* soft float FP libraries.
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*/
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extern int __flt_rounds __P((void));
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int
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__flt_rounds()
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{
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return(map[fpgetround()]);
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}
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