Added Berkeley softfloat library
(http://www.jhauser.us/arithmetic/SoftFloat.html) with RISCV specialization and cmake build
This commit is contained in:
496
softfloat/source/s_mulAddF64.c
Normal file
496
softfloat/source/s_mulAddF64.c
Normal file
@ -0,0 +1,496 @@
|
||||
|
||||
/*============================================================================
|
||||
|
||||
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 "platform.h"
|
||||
#include "internals.h"
|
||||
#include "specialize.h"
|
||||
#include "softfloat.h"
|
||||
|
||||
#ifdef SOFTFLOAT_FAST_INT64
|
||||
|
||||
float64_t
|
||||
softfloat_mulAddF64(
|
||||
uint_fast64_t uiA, uint_fast64_t uiB, uint_fast64_t uiC, uint_fast8_t op )
|
||||
{
|
||||
bool signA;
|
||||
int_fast16_t expA;
|
||||
uint_fast64_t sigA;
|
||||
bool signB;
|
||||
int_fast16_t expB;
|
||||
uint_fast64_t sigB;
|
||||
bool signC;
|
||||
int_fast16_t expC;
|
||||
uint_fast64_t sigC;
|
||||
bool signZ;
|
||||
uint_fast64_t magBits, uiZ;
|
||||
struct exp16_sig64 normExpSig;
|
||||
int_fast16_t expZ;
|
||||
struct uint128 sig128Z;
|
||||
uint_fast64_t sigZ;
|
||||
int_fast16_t expDiff;
|
||||
struct uint128 sig128C;
|
||||
int_fast8_t shiftDist;
|
||||
union ui64_f64 uZ;
|
||||
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
signA = signF64UI( uiA );
|
||||
expA = expF64UI( uiA );
|
||||
sigA = fracF64UI( uiA );
|
||||
signB = signF64UI( uiB );
|
||||
expB = expF64UI( uiB );
|
||||
sigB = fracF64UI( uiB );
|
||||
signC = signF64UI( uiC ) ^ (op == softfloat_mulAdd_subC);
|
||||
expC = expF64UI( uiC );
|
||||
sigC = fracF64UI( uiC );
|
||||
signZ = signA ^ signB ^ (op == softfloat_mulAdd_subProd);
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
if ( expA == 0x7FF ) {
|
||||
if ( sigA || ((expB == 0x7FF) && sigB) ) goto propagateNaN_ABC;
|
||||
magBits = expB | sigB;
|
||||
goto infProdArg;
|
||||
}
|
||||
if ( expB == 0x7FF ) {
|
||||
if ( sigB ) goto propagateNaN_ABC;
|
||||
magBits = expA | sigA;
|
||||
goto infProdArg;
|
||||
}
|
||||
if ( expC == 0x7FF ) {
|
||||
if ( sigC ) {
|
||||
uiZ = 0;
|
||||
goto propagateNaN_ZC;
|
||||
}
|
||||
uiZ = uiC;
|
||||
goto uiZ;
|
||||
}
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
if ( ! expA ) {
|
||||
if ( ! sigA ) goto zeroProd;
|
||||
normExpSig = softfloat_normSubnormalF64Sig( sigA );
|
||||
expA = normExpSig.exp;
|
||||
sigA = normExpSig.sig;
|
||||
}
|
||||
if ( ! expB ) {
|
||||
if ( ! sigB ) goto zeroProd;
|
||||
normExpSig = softfloat_normSubnormalF64Sig( sigB );
|
||||
expB = normExpSig.exp;
|
||||
sigB = normExpSig.sig;
|
||||
}
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
expZ = expA + expB - 0x3FE;
|
||||
sigA = (sigA | UINT64_C( 0x0010000000000000 ))<<10;
|
||||
sigB = (sigB | UINT64_C( 0x0010000000000000 ))<<10;
|
||||
sig128Z = softfloat_mul64To128( sigA, sigB );
|
||||
if ( sig128Z.v64 < UINT64_C( 0x2000000000000000 ) ) {
|
||||
--expZ;
|
||||
sig128Z =
|
||||
softfloat_add128(
|
||||
sig128Z.v64, sig128Z.v0, sig128Z.v64, sig128Z.v0 );
|
||||
}
|
||||
if ( ! expC ) {
|
||||
if ( ! sigC ) {
|
||||
--expZ;
|
||||
sigZ = sig128Z.v64<<1 | (sig128Z.v0 != 0);
|
||||
goto roundPack;
|
||||
}
|
||||
normExpSig = softfloat_normSubnormalF64Sig( sigC );
|
||||
expC = normExpSig.exp;
|
||||
sigC = normExpSig.sig;
|
||||
}
|
||||
sigC = (sigC | UINT64_C( 0x0010000000000000 ))<<9;
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
expDiff = expZ - expC;
|
||||
if ( expDiff < 0 ) {
|
||||
expZ = expC;
|
||||
if ( (signZ == signC) || (expDiff < -1) ) {
|
||||
sig128Z.v64 = softfloat_shiftRightJam64( sig128Z.v64, -expDiff );
|
||||
} else {
|
||||
sig128Z =
|
||||
softfloat_shortShiftRightJam128( sig128Z.v64, sig128Z.v0, 1 );
|
||||
}
|
||||
} else if ( expDiff ) {
|
||||
sig128C = softfloat_shiftRightJam128( sigC, 0, expDiff );
|
||||
}
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
if ( signZ == signC ) {
|
||||
/*--------------------------------------------------------------------
|
||||
*--------------------------------------------------------------------*/
|
||||
if ( expDiff <= 0 ) {
|
||||
sigZ = (sigC + sig128Z.v64) | (sig128Z.v0 != 0);
|
||||
} else {
|
||||
sig128Z =
|
||||
softfloat_add128(
|
||||
sig128Z.v64, sig128Z.v0, sig128C.v64, sig128C.v0 );
|
||||
sigZ = sig128Z.v64 | (sig128Z.v0 != 0);
|
||||
}
|
||||
if ( sigZ < UINT64_C( 0x4000000000000000 ) ) {
|
||||
--expZ;
|
||||
sigZ <<= 1;
|
||||
}
|
||||
} else {
|
||||
/*--------------------------------------------------------------------
|
||||
*--------------------------------------------------------------------*/
|
||||
if ( expDiff < 0 ) {
|
||||
signZ = signC;
|
||||
sig128Z = softfloat_sub128( sigC, 0, sig128Z.v64, sig128Z.v0 );
|
||||
} else if ( ! expDiff ) {
|
||||
sig128Z.v64 = sig128Z.v64 - sigC;
|
||||
if ( ! (sig128Z.v64 | sig128Z.v0) ) goto completeCancellation;
|
||||
if ( sig128Z.v64 & UINT64_C( 0x8000000000000000 ) ) {
|
||||
signZ = ! signZ;
|
||||
sig128Z = softfloat_sub128( 0, 0, sig128Z.v64, sig128Z.v0 );
|
||||
}
|
||||
} else {
|
||||
sig128Z =
|
||||
softfloat_sub128(
|
||||
sig128Z.v64, sig128Z.v0, sig128C.v64, sig128C.v0 );
|
||||
}
|
||||
/*--------------------------------------------------------------------
|
||||
*--------------------------------------------------------------------*/
|
||||
if ( ! sig128Z.v64 ) {
|
||||
expZ -= 64;
|
||||
sig128Z.v64 = sig128Z.v0;
|
||||
sig128Z.v0 = 0;
|
||||
}
|
||||
shiftDist = softfloat_countLeadingZeros64( sig128Z.v64 ) - 1;
|
||||
expZ -= shiftDist;
|
||||
if ( shiftDist < 0 ) {
|
||||
sigZ = softfloat_shortShiftRightJam64( sig128Z.v64, -shiftDist );
|
||||
} else {
|
||||
sig128Z =
|
||||
softfloat_shortShiftLeft128(
|
||||
sig128Z.v64, sig128Z.v0, shiftDist );
|
||||
sigZ = sig128Z.v64;
|
||||
}
|
||||
sigZ |= (sig128Z.v0 != 0);
|
||||
}
|
||||
roundPack:
|
||||
return softfloat_roundPackToF64( signZ, expZ, sigZ );
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
propagateNaN_ABC:
|
||||
uiZ = softfloat_propagateNaNF64UI( uiA, uiB );
|
||||
goto propagateNaN_ZC;
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
infProdArg:
|
||||
if ( magBits ) {
|
||||
uiZ = packToF64UI( signZ, 0x7FF, 0 );
|
||||
if ( expC != 0x7FF ) goto uiZ;
|
||||
if ( sigC ) goto propagateNaN_ZC;
|
||||
if ( signZ == signC ) goto uiZ;
|
||||
}
|
||||
softfloat_raiseFlags( softfloat_flag_invalid );
|
||||
uiZ = defaultNaNF64UI;
|
||||
propagateNaN_ZC:
|
||||
uiZ = softfloat_propagateNaNF64UI( uiZ, uiC );
|
||||
goto uiZ;
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
zeroProd:
|
||||
uiZ = uiC;
|
||||
if ( ! (expC | sigC) && (signZ != signC) ) {
|
||||
completeCancellation:
|
||||
uiZ =
|
||||
packToF64UI(
|
||||
(softfloat_roundingMode == softfloat_round_min), 0, 0 );
|
||||
}
|
||||
uiZ:
|
||||
uZ.ui = uiZ;
|
||||
return uZ.f;
|
||||
|
||||
}
|
||||
|
||||
#else
|
||||
|
||||
float64_t
|
||||
softfloat_mulAddF64(
|
||||
uint_fast64_t uiA, uint_fast64_t uiB, uint_fast64_t uiC, uint_fast8_t op )
|
||||
{
|
||||
bool signA;
|
||||
int_fast16_t expA;
|
||||
uint64_t sigA;
|
||||
bool signB;
|
||||
int_fast16_t expB;
|
||||
uint64_t sigB;
|
||||
bool signC;
|
||||
int_fast16_t expC;
|
||||
uint64_t sigC;
|
||||
bool signZ;
|
||||
uint64_t magBits, uiZ;
|
||||
struct exp16_sig64 normExpSig;
|
||||
int_fast16_t expZ;
|
||||
uint32_t sig128Z[4];
|
||||
uint64_t sigZ;
|
||||
int_fast16_t shiftDist, expDiff;
|
||||
uint32_t sig128C[4];
|
||||
union ui64_f64 uZ;
|
||||
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
signA = signF64UI( uiA );
|
||||
expA = expF64UI( uiA );
|
||||
sigA = fracF64UI( uiA );
|
||||
signB = signF64UI( uiB );
|
||||
expB = expF64UI( uiB );
|
||||
sigB = fracF64UI( uiB );
|
||||
signC = signF64UI( uiC ) ^ (op == softfloat_mulAdd_subC);
|
||||
expC = expF64UI( uiC );
|
||||
sigC = fracF64UI( uiC );
|
||||
signZ = signA ^ signB ^ (op == softfloat_mulAdd_subProd);
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
if ( expA == 0x7FF ) {
|
||||
if ( sigA || ((expB == 0x7FF) && sigB) ) goto propagateNaN_ABC;
|
||||
magBits = expB | sigB;
|
||||
goto infProdArg;
|
||||
}
|
||||
if ( expB == 0x7FF ) {
|
||||
if ( sigB ) goto propagateNaN_ABC;
|
||||
magBits = expA | sigA;
|
||||
goto infProdArg;
|
||||
}
|
||||
if ( expC == 0x7FF ) {
|
||||
if ( sigC ) {
|
||||
uiZ = 0;
|
||||
goto propagateNaN_ZC;
|
||||
}
|
||||
uiZ = uiC;
|
||||
goto uiZ;
|
||||
}
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
if ( ! expA ) {
|
||||
if ( ! sigA ) goto zeroProd;
|
||||
normExpSig = softfloat_normSubnormalF64Sig( sigA );
|
||||
expA = normExpSig.exp;
|
||||
sigA = normExpSig.sig;
|
||||
}
|
||||
if ( ! expB ) {
|
||||
if ( ! sigB ) goto zeroProd;
|
||||
normExpSig = softfloat_normSubnormalF64Sig( sigB );
|
||||
expB = normExpSig.exp;
|
||||
sigB = normExpSig.sig;
|
||||
}
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
expZ = expA + expB - 0x3FE;
|
||||
sigA = (sigA | UINT64_C( 0x0010000000000000 ))<<10;
|
||||
sigB = (sigB | UINT64_C( 0x0010000000000000 ))<<11;
|
||||
softfloat_mul64To128M( sigA, sigB, sig128Z );
|
||||
sigZ =
|
||||
(uint64_t) sig128Z[indexWord( 4, 3 )]<<32 | sig128Z[indexWord( 4, 2 )];
|
||||
shiftDist = 0;
|
||||
if ( ! (sigZ & UINT64_C( 0x4000000000000000 )) ) {
|
||||
--expZ;
|
||||
shiftDist = -1;
|
||||
}
|
||||
if ( ! expC ) {
|
||||
if ( ! sigC ) {
|
||||
if ( shiftDist ) sigZ <<= 1;
|
||||
goto sigZ;
|
||||
}
|
||||
normExpSig = softfloat_normSubnormalF64Sig( sigC );
|
||||
expC = normExpSig.exp;
|
||||
sigC = normExpSig.sig;
|
||||
}
|
||||
sigC = (sigC | UINT64_C( 0x0010000000000000 ))<<10;
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
expDiff = expZ - expC;
|
||||
if ( expDiff < 0 ) {
|
||||
expZ = expC;
|
||||
if ( (signZ == signC) || (expDiff < -1) ) {
|
||||
shiftDist -= expDiff;
|
||||
if ( shiftDist) {
|
||||
sigZ = softfloat_shiftRightJam64( sigZ, shiftDist );
|
||||
}
|
||||
} else {
|
||||
if ( ! shiftDist ) {
|
||||
softfloat_shortShiftRight128M( sig128Z, 1, sig128Z );
|
||||
}
|
||||
}
|
||||
} else {
|
||||
if ( shiftDist ) softfloat_add128M( sig128Z, sig128Z, sig128Z );
|
||||
if ( ! expDiff ) {
|
||||
sigZ =
|
||||
(uint64_t) sig128Z[indexWord( 4, 3 )]<<32
|
||||
| sig128Z[indexWord( 4, 2 )];
|
||||
} else {
|
||||
sig128C[indexWord( 4, 3 )] = sigC>>32;
|
||||
sig128C[indexWord( 4, 2 )] = sigC;
|
||||
sig128C[indexWord( 4, 1 )] = 0;
|
||||
sig128C[indexWord( 4, 0 )] = 0;
|
||||
softfloat_shiftRightJam128M( sig128C, expDiff, sig128C );
|
||||
}
|
||||
}
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
if ( signZ == signC ) {
|
||||
/*--------------------------------------------------------------------
|
||||
*--------------------------------------------------------------------*/
|
||||
if ( expDiff <= 0 ) {
|
||||
sigZ += sigC;
|
||||
} else {
|
||||
softfloat_add128M( sig128Z, sig128C, sig128Z );
|
||||
sigZ =
|
||||
(uint64_t) sig128Z[indexWord( 4, 3 )]<<32
|
||||
| sig128Z[indexWord( 4, 2 )];
|
||||
}
|
||||
if ( sigZ & UINT64_C( 0x8000000000000000 ) ) {
|
||||
++expZ;
|
||||
sigZ = softfloat_shortShiftRightJam64( sigZ, 1 );
|
||||
}
|
||||
} else {
|
||||
/*--------------------------------------------------------------------
|
||||
*--------------------------------------------------------------------*/
|
||||
if ( expDiff < 0 ) {
|
||||
signZ = signC;
|
||||
if ( expDiff < -1 ) {
|
||||
sigZ = sigC - sigZ;
|
||||
if (
|
||||
sig128Z[indexWord( 4, 1 )] || sig128Z[indexWord( 4, 0 )]
|
||||
) {
|
||||
sigZ = (sigZ - 1) | 1;
|
||||
}
|
||||
if ( ! (sigZ & UINT64_C( 0x4000000000000000 )) ) {
|
||||
--expZ;
|
||||
sigZ <<= 1;
|
||||
}
|
||||
goto roundPack;
|
||||
} else {
|
||||
sig128C[indexWord( 4, 3 )] = sigC>>32;
|
||||
sig128C[indexWord( 4, 2 )] = sigC;
|
||||
sig128C[indexWord( 4, 1 )] = 0;
|
||||
sig128C[indexWord( 4, 0 )] = 0;
|
||||
softfloat_sub128M( sig128C, sig128Z, sig128Z );
|
||||
}
|
||||
} else if ( ! expDiff ) {
|
||||
sigZ -= sigC;
|
||||
if (
|
||||
! sigZ && ! sig128Z[indexWord( 4, 1 )]
|
||||
&& ! sig128Z[indexWord( 4, 0 )]
|
||||
) {
|
||||
goto completeCancellation;
|
||||
}
|
||||
sig128Z[indexWord( 4, 3 )] = sigZ>>32;
|
||||
sig128Z[indexWord( 4, 2 )] = sigZ;
|
||||
if ( sigZ & UINT64_C( 0x8000000000000000 ) ) {
|
||||
signZ = ! signZ;
|
||||
softfloat_negX128M( sig128Z );
|
||||
}
|
||||
} else {
|
||||
softfloat_sub128M( sig128Z, sig128C, sig128Z );
|
||||
if ( 1 < expDiff ) {
|
||||
sigZ =
|
||||
(uint64_t) sig128Z[indexWord( 4, 3 )]<<32
|
||||
| sig128Z[indexWord( 4, 2 )];
|
||||
if ( ! (sigZ & UINT64_C( 0x4000000000000000 )) ) {
|
||||
--expZ;
|
||||
sigZ <<= 1;
|
||||
}
|
||||
goto sigZ;
|
||||
}
|
||||
}
|
||||
/*--------------------------------------------------------------------
|
||||
*--------------------------------------------------------------------*/
|
||||
shiftDist = 0;
|
||||
sigZ =
|
||||
(uint64_t) sig128Z[indexWord( 4, 3 )]<<32
|
||||
| sig128Z[indexWord( 4, 2 )];
|
||||
if ( ! sigZ ) {
|
||||
shiftDist = 64;
|
||||
sigZ =
|
||||
(uint64_t) sig128Z[indexWord( 4, 1 )]<<32
|
||||
| sig128Z[indexWord( 4, 0 )];
|
||||
}
|
||||
shiftDist += softfloat_countLeadingZeros64( sigZ ) - 1;
|
||||
if ( shiftDist ) {
|
||||
expZ -= shiftDist;
|
||||
softfloat_shiftLeft128M( sig128Z, shiftDist, sig128Z );
|
||||
sigZ =
|
||||
(uint64_t) sig128Z[indexWord( 4, 3 )]<<32
|
||||
| sig128Z[indexWord( 4, 2 )];
|
||||
}
|
||||
}
|
||||
sigZ:
|
||||
if ( sig128Z[indexWord( 4, 1 )] || sig128Z[indexWord( 4, 0 )] ) sigZ |= 1;
|
||||
roundPack:
|
||||
return softfloat_roundPackToF64( signZ, expZ - 1, sigZ );
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
propagateNaN_ABC:
|
||||
uiZ = softfloat_propagateNaNF64UI( uiA, uiB );
|
||||
goto propagateNaN_ZC;
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
infProdArg:
|
||||
if ( magBits ) {
|
||||
uiZ = packToF64UI( signZ, 0x7FF, 0 );
|
||||
if ( expC != 0x7FF ) goto uiZ;
|
||||
if ( sigC ) goto propagateNaN_ZC;
|
||||
if ( signZ == signC ) goto uiZ;
|
||||
}
|
||||
softfloat_raiseFlags( softfloat_flag_invalid );
|
||||
uiZ = defaultNaNF64UI;
|
||||
propagateNaN_ZC:
|
||||
uiZ = softfloat_propagateNaNF64UI( uiZ, uiC );
|
||||
goto uiZ;
|
||||
/*------------------------------------------------------------------------
|
||||
*------------------------------------------------------------------------*/
|
||||
zeroProd:
|
||||
uiZ = uiC;
|
||||
if ( ! (expC | sigC) && (signZ != signC) ) {
|
||||
completeCancellation:
|
||||
uiZ =
|
||||
packToF64UI(
|
||||
(softfloat_roundingMode == softfloat_round_min), 0, 0 );
|
||||
}
|
||||
uiZ:
|
||||
uZ.ui = uiZ;
|
||||
return uZ.f;
|
||||
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
Reference in New Issue
Block a user