feb1d5507e
-Werror warnings from clang 10.0.0, such as:
lib/libc/quad/fixdfdi.c:57:12: error: implicit conversion from 'long long' to 'double' changes value from 9223372036854775807 to 9223372036854775808 [-Werror,-Wimplicit-int-float-conversion]
if (x >= QUAD_MAX)
~~ ^~~~~~~~
/usr/obj/usr/src/powerpc.powerpc/tmp/usr/include/sys/limits.h:89:19: note: expanded from macro 'QUAD_MAX'
#define QUAD_MAX (__QUAD_MAX) /* max value for a quad_t */
^~~~~~~~~~
/usr/obj/usr/src/powerpc.powerpc/tmp/usr/include/machine/_limits.h:91:20: note: expanded from macro '__QUAD_MAX'
#define __QUAD_MAX __LLONG_MAX /* max value for a quad_t */
^~~~~~~~~~~
/usr/obj/usr/src/powerpc.powerpc/tmp/usr/include/machine/_limits.h:75:21: note: expanded from macro '__LLONG_MAX'
#define __LLONG_MAX 0x7fffffffffffffffLL /* max value for a long long */
^~~~~~~~~~~~~~~~~~~~
and many instances of:
lib/libc/quad/fixunsdfdi.c:73:17: error: shift count >= width of type [-Werror,-Wshift-count-overflow]
toppart = (x - ONE_HALF) / ONE;
^~~~~~~~
lib/libc/quad/fixunsdfdi.c:45:19: note: expanded from macro 'ONE_HALF'
#define ONE_HALF (ONE_FOURTH * 2.0)
^~~~~~~~~~
lib/libc/quad/fixunsdfdi.c:44:23: note: expanded from macro 'ONE_FOURTH'
#define ONE_FOURTH (1 << (LONG_BITS - 2))
^ ~~~~~~~~~~~~~~~
lib/libc/quad/fixunsdfdi.c:73:29: error: shift count >= width of type [-Werror,-Wshift-count-overflow]
toppart = (x - ONE_HALF) / ONE;
^~~
lib/libc/quad/fixunsdfdi.c:46:15: note: expanded from macro 'ONE'
#define ONE (ONE_FOURTH * 4.0)
^~~~~~~~~~
lib/libc/quad/fixunsdfdi.c:44:23: note: expanded from macro 'ONE_FOURTH'
#define ONE_FOURTH (1 << (LONG_BITS - 2))
^ ~~~~~~~~~~~~~~~
96 lines
3.3 KiB
C
96 lines
3.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)fixunsdfdi.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "quad.h"
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#define ONE_FOURTH (1L << (LONG_BITS - 2))
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#define ONE_HALF (ONE_FOURTH * 2.0)
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#define ONE (ONE_FOURTH * 4.0)
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/*
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* Convert double to (unsigned) quad.
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* Not sure what to do with negative numbers---for now, anything out
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* of range becomes UQUAD_MAX.
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*/
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u_quad_t
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__fixunsdfdi(double x)
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{
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double toppart;
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union uu t;
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if (x < 0)
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return (UQUAD_MAX); /* ??? should be 0? ERANGE??? */
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#ifdef notdef /* this falls afoul of a GCC bug */
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if (x >= UQUAD_MAX)
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return (UQUAD_MAX);
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#else /* so we wire in 2^64-1 instead */
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if (x >= 18446744073709551615.0)
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return (UQUAD_MAX);
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#endif
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/*
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* Get the upper part of the result. Note that the divide
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* may round up; we want to avoid this if possible, so we
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* subtract `1/2' first.
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*/
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toppart = (x - ONE_HALF) / ONE;
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/*
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* Now build a u_quad_t out of the top part. The difference
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* between x and this is the bottom part (this may introduce
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* a few fuzzy bits, but what the heck). With any luck this
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* difference will be nonnegative: x should wind up in the
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* range [0..ULONG_MAX]. For paranoia, we assume [LONG_MIN..
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* 2*ULONG_MAX] instead.
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*/
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t.ul[H] = (unsigned long)toppart;
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t.ul[L] = 0;
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x -= (double)t.uq;
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if (x < 0) {
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t.ul[H]--;
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x += (double)ULONG_MAX;
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}
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if (x > (double)ULONG_MAX) {
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t.ul[H]++;
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x -= (double)ULONG_MAX;
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}
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t.ul[L] = (u_long)x;
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return (t.uq);
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}
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