| |
| /*============================================================================ |
| |
| 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" |
| |
| #ifdef SOFTFLOAT_FAST_INT64 |
| |
| void |
| extF80M_mul( |
| const extFloat80_t *aPtr, const extFloat80_t *bPtr, extFloat80_t *zPtr ) |
| { |
| |
| *zPtr = extF80_mul( *aPtr, *bPtr ); |
| |
| } |
| |
| #else |
| |
| void |
| extF80M_mul( |
| const extFloat80_t *aPtr, const extFloat80_t *bPtr, extFloat80_t *zPtr ) |
| { |
| const struct extFloat80M *aSPtr, *bSPtr; |
| struct extFloat80M *zSPtr; |
| uint_fast16_t uiA64; |
| int32_t expA; |
| uint_fast16_t uiB64; |
| int32_t expB; |
| bool signZ; |
| uint_fast16_t exp, uiZ64; |
| uint64_t uiZ0, sigA, sigB; |
| int32_t expZ; |
| uint32_t sigProd[4], *extSigZPtr; |
| |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| aSPtr = (const struct extFloat80M *) aPtr; |
| bSPtr = (const struct extFloat80M *) bPtr; |
| zSPtr = (struct extFloat80M *) zPtr; |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| uiA64 = aSPtr->signExp; |
| expA = expExtF80UI64( uiA64 ); |
| uiB64 = bSPtr->signExp; |
| expB = expExtF80UI64( uiB64 ); |
| signZ = signExtF80UI64( uiA64 ) ^ signExtF80UI64( uiB64 ); |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| if ( (expA == 0x7FFF) || (expB == 0x7FFF) ) { |
| if ( softfloat_tryPropagateNaNExtF80M( aSPtr, bSPtr, zSPtr ) ) return; |
| if ( |
| (! aSPtr->signif && (expA != 0x7FFF)) |
| || (! bSPtr->signif && (expB != 0x7FFF)) |
| ) { |
| softfloat_invalidExtF80M( zSPtr ); |
| return; |
| } |
| uiZ64 = packToExtF80UI64( signZ, 0x7FFF ); |
| uiZ0 = UINT64_C( 0x8000000000000000 ); |
| goto uiZ; |
| } |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| if ( ! expA ) expA = 1; |
| sigA = aSPtr->signif; |
| if ( ! (sigA & UINT64_C( 0x8000000000000000 )) ) { |
| if ( ! sigA ) goto zero; |
| expA += softfloat_normExtF80SigM( &sigA ); |
| } |
| if ( ! expB ) expB = 1; |
| sigB = bSPtr->signif; |
| if ( ! (sigB & UINT64_C( 0x8000000000000000 )) ) { |
| if ( ! sigB ) goto zero; |
| expB += softfloat_normExtF80SigM( &sigB ); |
| } |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| expZ = expA + expB - 0x3FFE; |
| softfloat_mul64To128M( sigA, sigB, sigProd ); |
| if ( sigProd[indexWordLo( 4 )] ) sigProd[indexWord( 4, 1 )] |= 1; |
| extSigZPtr = &sigProd[indexMultiwordHi( 4, 3 )]; |
| if ( sigProd[indexWordHi( 4 )] < 0x80000000 ) { |
| --expZ; |
| softfloat_add96M( extSigZPtr, extSigZPtr, extSigZPtr ); |
| } |
| softfloat_roundPackMToExtF80M( |
| signZ, expZ, extSigZPtr, extF80_roundingPrecision, zSPtr ); |
| return; |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| zero: |
| uiZ64 = packToExtF80UI64( signZ, 0 ); |
| uiZ0 = 0; |
| uiZ: |
| zSPtr->signExp = uiZ64; |
| zSPtr->signif = uiZ0; |
| |
| } |
| |
| #endif |
| |