| |
| /*============================================================================ |
| |
| 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 |
| f128M_mul( const float128_t *aPtr, const float128_t *bPtr, float128_t *zPtr ) |
| { |
| |
| *zPtr = f128_mul( *aPtr, *bPtr ); |
| |
| } |
| |
| #else |
| |
| void |
| f128M_mul( const float128_t *aPtr, const float128_t *bPtr, float128_t *zPtr ) |
| { |
| const uint32_t *aWPtr, *bWPtr; |
| uint32_t *zWPtr; |
| uint32_t uiA96; |
| int32_t expA; |
| uint32_t uiB96; |
| int32_t expB; |
| bool signZ; |
| const uint32_t *ptr; |
| uint32_t uiZ96, sigA[4]; |
| uint_fast8_t shiftCount; |
| uint32_t sigB[4]; |
| int32_t expZ; |
| uint32_t sigProd[8], *extSigZPtr; |
| |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| aWPtr = (const uint32_t *) aPtr; |
| bWPtr = (const uint32_t *) bPtr; |
| zWPtr = (uint32_t *) zPtr; |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| uiA96 = aWPtr[indexWordHi( 4 )]; |
| expA = expF128UI96( uiA96 ); |
| uiB96 = bWPtr[indexWordHi( 4 )]; |
| expB = expF128UI96( uiB96 ); |
| signZ = signF128UI96( uiA96 ) ^ signF128UI96( uiB96 ); |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| if ( (expA == 0x7FFF) || (expB == 0x7FFF) ) { |
| if ( softfloat_tryPropagateNaNF128M( aWPtr, bWPtr, zWPtr ) ) return; |
| ptr = aWPtr; |
| if ( ! expA ) goto possiblyInvalid; |
| if ( ! expB ) { |
| ptr = bWPtr; |
| possiblyInvalid: |
| if ( |
| ! fracF128UI96( ptr[indexWordHi( 4 )] ) |
| && ! (ptr[indexWord( 4, 2 )] | ptr[indexWord( 4, 1 )] |
| | ptr[indexWord( 4, 0 )]) |
| ) { |
| softfloat_invalidF128M( zWPtr ); |
| return; |
| } |
| } |
| uiZ96 = packToF128UI96( signZ, 0x7FFF, 0 ); |
| goto uiZ96; |
| } |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| if ( expA ) { |
| sigA[indexWordHi( 4 )] = fracF128UI96( uiA96 ) | 0x00010000; |
| sigA[indexWord( 4, 2 )] = aWPtr[indexWord( 4, 2 )]; |
| sigA[indexWord( 4, 1 )] = aWPtr[indexWord( 4, 1 )]; |
| sigA[indexWord( 4, 0 )] = aWPtr[indexWord( 4, 0 )]; |
| } else { |
| expA = softfloat_shiftNormSigF128M( aWPtr, 0, sigA ); |
| if ( expA == -128 ) goto zero; |
| } |
| if ( expB ) { |
| sigB[indexWordHi( 4 )] = fracF128UI96( uiB96 ) | 0x00010000; |
| sigB[indexWord( 4, 2 )] = bWPtr[indexWord( 4, 2 )]; |
| sigB[indexWord( 4, 1 )] = bWPtr[indexWord( 4, 1 )]; |
| sigB[indexWord( 4, 0 )] = bWPtr[indexWord( 4, 0 )]; |
| } else { |
| expB = softfloat_shiftNormSigF128M( bWPtr, 0, sigB ); |
| if ( expB == -128 ) goto zero; |
| } |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| expZ = expA + expB - 0x4000; |
| softfloat_mul128MTo256M( sigA, sigB, sigProd ); |
| if ( |
| sigProd[indexWord( 8, 2 )] |
| || (sigProd[indexWord( 8, 1 )] | sigProd[indexWord( 8, 0 )]) |
| ) { |
| sigProd[indexWord( 8, 3 )] |= 1; |
| } |
| extSigZPtr = &sigProd[indexMultiwordHi( 8, 5 )]; |
| shiftCount = 16; |
| if ( extSigZPtr[indexWordHi( 5 )] & 2 ) { |
| ++expZ; |
| shiftCount = 15; |
| } |
| softfloat_shortShiftLeft160M( extSigZPtr, shiftCount, extSigZPtr ); |
| softfloat_roundPackMToF128M( signZ, expZ, extSigZPtr, zWPtr ); |
| return; |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| zero: |
| uiZ96 = packToF128UI96( signZ, 0, 0 ); |
| uiZ96: |
| zWPtr[indexWordHi( 4 )] = uiZ96; |
| zWPtr[indexWord( 4, 2 )] = 0; |
| zWPtr[indexWord( 4, 1 )] = 0; |
| zWPtr[indexWord( 4, 0 )] = 0; |
| |
| } |
| |
| #endif |
| |