| |
| /*============================================================================ |
| |
| This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic |
| Package, Release 3, by John R. Hauser. |
| |
| Copyright 2011, 2012, 2013, 2014 The Regents of the University of California |
| (Regents). All Rights Reserved. Redistribution and use in source and binary |
| forms, with or without modification, are permitted provided that the following |
| conditions are met: |
| |
| Redistributions of source code must retain the above copyright notice, |
| this list of conditions, and the following two paragraphs of disclaimer. |
| Redistributions in binary form must reproduce the above copyright notice, |
| this list of conditions, and the following two paragraphs of disclaimer in the |
| documentation and/or other materials provided with the distribution. Neither |
| the name of the Regents nor the names of its contributors may be used to |
| endorse or promote products derived from this software without specific prior |
| written permission. |
| |
| IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, |
| SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING |
| OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS |
| BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED |
| TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED |
| HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE |
| MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
| |
| =============================================================================*/ |
| |
| #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; |
| |
| } |
| |