Upgrade to softfloat3e.
This should solve licensing problems as well.
This commit is contained in:
TC1995
149
src/cpu/softfloat3e/f16_div.c
Normal file
149
src/cpu/softfloat3e/f16_div.c
Normal file
@@ -0,0 +1,149 @@
|
||||
/*============================================================================
|
||||
|
||||
This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
|
||||
Package, Release 3e, by John R. Hauser.
|
||||
|
||||
Copyright 2011, 2012, 2013, 2014, 2015, 2016 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 "specialize.h"
|
||||
#include "softfloat.h"
|
||||
|
||||
#define SOFTFLOAT_FAST_DIV32TO16 1
|
||||
|
||||
extern const uint16_t softfloat_approxRecip_1k0s[];
|
||||
extern const uint16_t softfloat_approxRecip_1k1s[];
|
||||
|
||||
float16 f16_div(float16 a, float16 b, struct softfloat_status_t *status)
|
||||
{
|
||||
bool signA;
|
||||
int8_t expA;
|
||||
uint16_t sigA;
|
||||
bool signB;
|
||||
int8_t expB;
|
||||
uint16_t sigB;
|
||||
bool signZ;
|
||||
struct exp8_sig16 normExpSig;
|
||||
int8_t expZ;
|
||||
#ifdef SOFTFLOAT_FAST_DIV32TO16
|
||||
uint32_t sig32A;
|
||||
uint16_t sigZ;
|
||||
#endif
|
||||
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
signA = signF16UI(a);
|
||||
expA = expF16UI(a);
|
||||
sigA = fracF16UI(a);
|
||||
signB = signF16UI(b);
|
||||
expB = expF16UI(b);
|
||||
sigB = fracF16UI(b);
|
||||
signZ = signA ^ signB;
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
if (softfloat_denormalsAreZeros(status)) {
|
||||
if (!expA) sigA = 0;
|
||||
if (!expB) sigB = 0;
|
||||
}
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
if (expA == 0x1F) {
|
||||
if (sigA) goto propagateNaN;
|
||||
if (expB == 0x1F) {
|
||||
if (sigB) goto propagateNaN;
|
||||
goto invalid;
|
||||
}
|
||||
if (sigB && !expB)
|
||||
softfloat_raiseFlags(status, softfloat_flag_denormal);
|
||||
goto infinity;
|
||||
}
|
||||
if (expB == 0x1F) {
|
||||
if (sigB) goto propagateNaN;
|
||||
if (sigA && !expA)
|
||||
softfloat_raiseFlags(status, softfloat_flag_denormal);
|
||||
goto zero;
|
||||
}
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
if (! expB) {
|
||||
if (! sigB) {
|
||||
if (! (expA | sigA)) goto invalid;
|
||||
softfloat_raiseFlags(status, softfloat_flag_infinite);
|
||||
goto infinity;
|
||||
}
|
||||
softfloat_raiseFlags(status, softfloat_flag_denormal);
|
||||
normExpSig = softfloat_normSubnormalF16Sig(sigB);
|
||||
expB = normExpSig.exp;
|
||||
sigB = normExpSig.sig;
|
||||
}
|
||||
if (! expA) {
|
||||
if (! sigA) goto zero;
|
||||
softfloat_raiseFlags(status, softfloat_flag_denormal);
|
||||
normExpSig = softfloat_normSubnormalF16Sig(sigA);
|
||||
expA = normExpSig.exp;
|
||||
sigA = normExpSig.sig;
|
||||
}
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
expZ = expA - expB + 0xE;
|
||||
sigA |= 0x0400;
|
||||
sigB |= 0x0400;
|
||||
#ifdef SOFTFLOAT_FAST_DIV32TO16
|
||||
if (sigA < sigB) {
|
||||
--expZ;
|
||||
sig32A = (uint32_t) sigA<<15;
|
||||
} else {
|
||||
sig32A = (uint32_t) sigA<<14;
|
||||
}
|
||||
sigZ = sig32A / sigB;
|
||||
if (! (sigZ & 7)) sigZ |= ((uint32_t) sigB * sigZ != sig32A);
|
||||
#endif
|
||||
return softfloat_roundPackToF16(signZ, expZ, sigZ, status);
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
propagateNaN:
|
||||
return softfloat_propagateNaNF16UI(a, b, status);
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
invalid:
|
||||
softfloat_raiseFlags(status, softfloat_flag_invalid);
|
||||
return defaultNaNF16UI;
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
infinity:
|
||||
return packToF16UI(signZ, 0x1F, 0);
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
zero:
|
||||
return packToF16UI(signZ, 0, 0);
|
||||
}
|
||||
Reference in New Issue
Block a user