/*============================================================================ 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 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" float64_t f64_mul( float64_t a, float64_t b ) { union ui64_f64 uA; uint_fast64_t uiA; bool signA; int_fast16_t expA; uint_fast64_t sigA; union ui64_f64 uB; uint_fast64_t uiB; bool signB; int_fast16_t expB; uint_fast64_t sigB; bool signZ; uint_fast64_t magBits; struct exp16_sig64 normExpSig; int_fast16_t expZ; #ifdef SOFTFLOAT_FAST_INT64 struct uint128 sig128Z; #else uint32_t sig128Z[4]; #endif uint_fast64_t sigZ, uiZ; union ui64_f64 uZ; /*------------------------------------------------------------------------ *------------------------------------------------------------------------*/ uA.f = a; uiA = uA.ui; signA = signF64UI( uiA ); expA = expF64UI( uiA ); sigA = fracF64UI( uiA ); uB.f = b; uiB = uB.ui; signB = signF64UI( uiB ); expB = expF64UI( uiB ); sigB = fracF64UI( uiB ); signZ = signA ^ signB; /*------------------------------------------------------------------------ *------------------------------------------------------------------------*/ if ( expA == 0x7FF ) { if ( sigA || ((expB == 0x7FF) && sigB) ) goto propagateNaN; magBits = expB | sigB; goto infArg; } if ( expB == 0x7FF ) { if ( sigB ) goto propagateNaN; magBits = expA | sigA; goto infArg; } /*------------------------------------------------------------------------ *------------------------------------------------------------------------*/ if ( ! expA ) { if ( ! sigA ) goto zero; normExpSig = softfloat_normSubnormalF64Sig( sigA ); expA = normExpSig.exp; sigA = normExpSig.sig; } if ( ! expB ) { if ( ! sigB ) goto zero; normExpSig = softfloat_normSubnormalF64Sig( sigB ); expB = normExpSig.exp; sigB = normExpSig.sig; } /*------------------------------------------------------------------------ *------------------------------------------------------------------------*/ expZ = expA + expB - 0x3FF; sigA = (sigA | UINT64_C( 0x0010000000000000 ))<<10; sigB = (sigB | UINT64_C( 0x0010000000000000 ))<<11; #ifdef SOFTFLOAT_FAST_INT64 sig128Z = softfloat_mul64To128( sigA, sigB ); sigZ = sig128Z.v64 | (sig128Z.v0 != 0); #else softfloat_mul64To128M( sigA, sigB, sig128Z ); sigZ = (uint64_t) sig128Z[indexWord( 4, 3 )]<<32 | sig128Z[indexWord( 4, 2 )]; if ( sig128Z[indexWord( 4, 1 )] || sig128Z[indexWord( 4, 0 )] ) sigZ |= 1; #endif if ( sigZ < UINT64_C( 0x4000000000000000 ) ) { --expZ; sigZ <<= 1; } return softfloat_roundPackToF64( signZ, expZ, sigZ ); /*------------------------------------------------------------------------ *------------------------------------------------------------------------*/ propagateNaN: uiZ = softfloat_propagateNaNF64UI( uiA, uiB ); goto uiZ; /*------------------------------------------------------------------------ *------------------------------------------------------------------------*/ infArg: if ( ! magBits ) { softfloat_raiseFlags( softfloat_flag_invalid ); uiZ = defaultNaNF64UI; } else { uiZ = packToF64UI( signZ, 0x7FF, 0 ); } goto uiZ; /*------------------------------------------------------------------------ *------------------------------------------------------------------------*/ zero: uiZ = packToF64UI( signZ, 0, 0 ); uiZ: uZ.ui = uiZ; return uZ.f; }