| |
| /*============================================================================ |
| |
| 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" |
| |
| extFloat80_t extF80_mul( extFloat80_t a, extFloat80_t b ) |
| { |
| union { struct extFloat80M s; extFloat80_t f; } uA; |
| uint_fast16_t uiA64; |
| uint_fast64_t uiA0; |
| bool signA; |
| int_fast32_t expA; |
| uint_fast64_t sigA; |
| union { struct extFloat80M s; extFloat80_t f; } uB; |
| uint_fast16_t uiB64; |
| uint_fast64_t uiB0; |
| bool signB; |
| int_fast32_t expB; |
| uint_fast64_t sigB; |
| bool signZ; |
| uint_fast64_t magBits; |
| struct exp32_sig64 normExpSig; |
| int_fast32_t expZ; |
| struct uint128 sig128Z, uiZ; |
| uint_fast16_t uiZ64; |
| uint_fast64_t uiZ0; |
| union { struct extFloat80M s; extFloat80_t f; } uZ; |
| |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| uA.f = a; |
| uiA64 = uA.s.signExp; |
| uiA0 = uA.s.signif; |
| signA = signExtF80UI64( uiA64 ); |
| expA = expExtF80UI64( uiA64 ); |
| sigA = uiA0; |
| uB.f = b; |
| uiB64 = uB.s.signExp; |
| uiB0 = uB.s.signif; |
| signB = signExtF80UI64( uiB64 ); |
| expB = expExtF80UI64( uiB64 ); |
| sigB = uiB0; |
| signZ = signA ^ signB; |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| if ( expA == 0x7FFF ) { |
| if ( |
| (sigA & UINT64_C( 0x7FFFFFFFFFFFFFFF )) |
| || ((expB == 0x7FFF) && (sigB & UINT64_C( 0x7FFFFFFFFFFFFFFF ))) |
| ) { |
| goto propagateNaN; |
| } |
| magBits = expB | sigB; |
| goto infArg; |
| } |
| if ( expB == 0x7FFF ) { |
| if ( sigB & UINT64_C( 0x7FFFFFFFFFFFFFFF ) ) goto propagateNaN; |
| magBits = expA | sigA; |
| goto infArg; |
| } |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| if ( ! expA ) expA = 1; |
| if ( ! (sigA & UINT64_C( 0x8000000000000000 )) ) { |
| if ( ! sigA ) goto zero; |
| normExpSig = softfloat_normSubnormalExtF80Sig( sigA ); |
| expA += normExpSig.exp; |
| sigA = normExpSig.sig; |
| } |
| if ( ! expB ) expB = 1; |
| if ( ! (sigB & UINT64_C( 0x8000000000000000 )) ) { |
| if ( ! sigB ) goto zero; |
| normExpSig = softfloat_normSubnormalExtF80Sig( sigB ); |
| expB += normExpSig.exp; |
| sigB = normExpSig.sig; |
| } |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| expZ = expA + expB - 0x3FFE; |
| sig128Z = softfloat_mul64To128( sigA, sigB ); |
| if ( sig128Z.v64 < UINT64_C( 0x8000000000000000 ) ) { |
| --expZ; |
| sig128Z = |
| softfloat_add128( |
| sig128Z.v64, sig128Z.v0, sig128Z.v64, sig128Z.v0 ); |
| } |
| return |
| softfloat_roundPackToExtF80( |
| signZ, expZ, sig128Z.v64, sig128Z.v0, extF80_roundingPrecision ); |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| propagateNaN: |
| uiZ = softfloat_propagateNaNExtF80UI( uiA64, uiA0, uiB64, uiB0 ); |
| uiZ64 = uiZ.v64; |
| uiZ0 = uiZ.v0; |
| goto uiZ; |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| infArg: |
| if ( ! magBits ) { |
| softfloat_raiseFlags( softfloat_flag_invalid ); |
| uiZ64 = defaultNaNExtF80UI64; |
| uiZ0 = defaultNaNExtF80UI0; |
| } else { |
| uiZ64 = packToExtF80UI64( signZ, 0x7FFF ); |
| uiZ0 = UINT64_C( 0x8000000000000000 ); |
| } |
| goto uiZ; |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| zero: |
| uiZ64 = packToExtF80UI64( signZ, 0 ); |
| uiZ0 = 0; |
| uiZ: |
| uZ.s.signExp = uiZ64; |
| uZ.s.signif = uiZ0; |
| return uZ.f; |
| |
| } |
| |