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ext: Add SoftFloat Library to ext directory

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This patch adds Softfloat library for supporting RISCV
float operation implement.

Using SoftFloat Package to reinplement Riscv FPops.

Jira Issue: https://gem5.atlassian.net/browse/GEM5-373

Change-Id: Ic96e6c8adec0713bdbd744d581c750034b88246c
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/39357
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
This commit is contained in:
kai.ren
2021-01-21 15:53:33 +08:00
committed by Kai Ren
parent d07fd9667e
commit 3a9d0de609
228 changed files with 22019 additions and 0 deletions
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85
ext/softfloat/s_roundToI32.c Normal file
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/*============================================================================
This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
Package, Release 3d, by John R. Hauser.
Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 The Regents of the
University of California. 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.
3. Neither the name of the University nor the names of its contributors may
be used to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 <stdbool.h>
#include <stdint.h>
#include "internals.h"
#include "platform.h"
#include "softfloat.h"
#include "specialize.h"
int_fast32_t
softfloat_roundToI32(
bool sign, uint_fast64_t sig, uint_fast8_t roundingMode, bool exact )
{
bool roundNearEven;
uint_fast16_t roundIncrement, roundBits;
uint_fast32_t sig32;
union { uint32_t ui; int32_t i; } uZ;
int_fast32_t z;
/*------------------------------------------------------------------------
*------------------------------------------------------------------------*/
roundNearEven = (roundingMode == softfloat_round_near_even);
roundIncrement = 0x800;
if ( ! roundNearEven && (roundingMode != softfloat_round_near_maxMag) ) {
roundIncrement =
(roundingMode
== (sign ? softfloat_round_min : softfloat_round_max))
? 0xFFF
: 0;
}
roundBits = sig & 0xFFF;
sig += roundIncrement;
if ( sig & UINT64_C( 0xFFFFF00000000000 ) ) goto invalid;
sig32 = sig>>12;
sig32 &= ~(uint_fast32_t) (! (roundBits ^ 0x800) & roundNearEven);
uZ.ui = sign ? -sig32 : sig32;
z = uZ.i;
if ( z && ((z < 0) ^ sign) ) goto invalid;
if ( exact && roundBits ) {
softfloat_exceptionFlags |= softfloat_flag_inexact;
}
return z;
/*------------------------------------------------------------------------
*------------------------------------------------------------------------*/
invalid:
softfloat_raiseFlags( softfloat_flag_invalid );
return sign ? i32_fromNegOverflow : i32_fromPosOverflow;
}