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73bce6597c
RISC-V newlib fails to build for soft float multilibs since long double
support was enabled in:
commit 04798b7bb69571452d2cfc7e0b052a9bbd3b619d
Author: Kito Cheng <kito.cheng@sifive.com>
Date: Mon Dec 4 15:41:39 2023 +0800
RISC-V: Support long double math
Long double for RISC-V is using 128 bit IEEE 754 format like Aarch64,
so we reference AArch64 to support that.
The RISC-V soft floating point environment only supports the
FE_TONEAREST rounding mode and does not support exceptions. Guard long
double rounding and exception support with ifdefs based on the presence
of the relevant rounding modes and exceptions.
Tested on gcc/g++ testsuite using RISC-V GNU Newlib Toolchain built by
riscv-gnu-toolchain with multilibs:
riscv-sim/-march=rv32i/-mabi=ilp32/-mcmodel=medlow
riscv-sim/-march=rv32iac/-mabi=ilp32/-mcmodel=medlow
riscv-sim/-march=rv32im/-mabi=ilp32/-mcmodel=medlow
riscv-sim/-march=rv32imac/-mabi=ilp32/-mcmodel=medlow
riscv-sim/-march=rv32imafc/-mabi=ilp32f/-mcmodel=medlow
riscv-sim/-march=rv64imac/-mabi=lp64/-mcmodel=medlow
Co-authored-by: Simon Cook <simon.cook@embecosm.com>
73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2005 David Schultz <das@FreeBSD.ORG>
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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 <sys/cdefs.h>
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#include <limits.h>
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#include <fenv.h>
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#include <math.h>
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#ifndef type
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__FBSDID("$FreeBSD$");
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#define type double
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#define roundit round
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#define dtype long
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#define DTYPE_MIN LONG_MIN
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#define DTYPE_MAX LONG_MAX
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#define fn lround
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#endif
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/*
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* If type has more precision than dtype, the endpoints dtype_(min|max) are
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* of the form xxx.5; they are "out of range" because lround() rounds away
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* from 0. On the other hand, if type has less precision than dtype, then
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* all values that are out of range are integral, so we might as well assume
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* that everything is in range. At compile time, INRANGE(x) should reduce to
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* two floating-point comparisons in the former case, or TRUE otherwise.
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*/
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static const type type_min = (type)DTYPE_MIN;
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static const type type_max = (type)DTYPE_MAX;
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static const type dtype_min = (type)DTYPE_MIN - 0.5;
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static const type dtype_max = (type)DTYPE_MAX + 0.5;
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#define INRANGE(x) (dtype_max - type_max != 0.5 || \
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((x) > dtype_min && (x) < dtype_max))
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dtype
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fn(type x)
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{
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if (INRANGE(x)) {
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x = roundit(x);
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return ((dtype)x);
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} else {
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#ifdef FE_INVALID
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feraiseexcept(FE_INVALID);
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#endif
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return (DTYPE_MAX);
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}
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}
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