Differential D2132 Diff 4679 lib/libc/aarch64/gen/flt_rounds.c

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lib/libc/aarch64/gen/flt_rounds.c

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				/*-
				* Copyright (c) 2012 Ian Lepore <freebsd@damnhippie.dyndns.org>
				* 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 <sys/cdefs.h>
				__FBSDID("$FreeBSD$");

				#include <sys/types.h>

				#include <fenv.h>
				#include <float.h>

				static int map[] = {
				1, /* round to nearest */
				2, /* round to positive infinity */
				impUnsubmitted Not Done Inline Actions This is bogus, unless we have soft floats... And I'm not sure the copyright applies... imp: This is bogus, unless we have soft floats... And I'm not sure the copyright applies...
				impUnsubmitted Not Done Inline Actions This is wrong unless we have soft float. It needs to be 0..3 for the current FP mode we're running in. imp: This is wrong unless we have soft float. It needs to be 0..3 for the current FP mode we're…
				emasteUnsubmitted Not Done Inline Actions It's a bit strange - my understanding: the ABI specifies long double is 128-bit quad precision, but there's no hardware support. So long double is soft float, while float/double is hard. emaste: It's a bit strange - my understanding: the ABI specifies long double is 128-bit quad precision…
				emasteUnsubmitted Not Done Inline Actions @imp says This is bogus, unless we have soft floats... We have hard float for `float` and `double`. The ABI specifies `long double` is 128-bit quad precision, but there is no hardware support, so we have soft float there. emaste: > @imp says > This is bogus, unless we have soft floats... We have hard float for `float` and…
				andrewAuthorUnsubmitted Not Done Inline Actions It needs to return a value depending on the rounding mode, I still need to add the asm to get this. andrew: It needs to return a value depending on the rounding mode, I still need to add the asm to get…
				3, /* round to negative infinity */
				0 /* round to zero */
				};

				int
				__flt_rounds(void)
				{
				uint64_t fpcr;

				asm volatile("mrs %0, fpcr" : "=r" (fpcr));
				return map[(fpcr >> 22) & 3];
				}