| |
| /*============================================================================ |
| |
| 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 |
| softfloat_addMagsExtF80( |
| uint_fast16_t uiA64, |
| uint_fast64_t uiA0, |
| uint_fast16_t uiB64, |
| uint_fast64_t uiB0, |
| bool signZ |
| ) |
| { |
| int_fast32_t expA; |
| uint_fast64_t sigA; |
| int_fast32_t expB; |
| uint_fast64_t sigB; |
| int_fast32_t expDiff; |
| uint_fast16_t uiZ64; |
| uint_fast64_t uiZ0, sigZ, sigZExtra; |
| struct exp32_sig64 normExpSig; |
| int_fast32_t expZ; |
| struct uint64_extra sig64Extra; |
| struct uint128 uiZ; |
| union { struct extFloat80M s; extFloat80_t f; } uZ; |
| |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| expA = expExtF80UI64( uiA64 ); |
| sigA = uiA0; |
| expB = expExtF80UI64( uiB64 ); |
| sigB = uiB0; |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| expDiff = expA - expB; |
| if ( ! expDiff ) { |
| if ( expA == 0x7FFF ) { |
| if ( (sigA | sigB) & UINT64_C( 0x7FFFFFFFFFFFFFFF ) ) { |
| goto propagateNaN; |
| } |
| uiZ64 = uiA64; |
| uiZ0 = uiA0; |
| goto uiZ; |
| } |
| sigZ = sigA + sigB; |
| sigZExtra = 0; |
| if ( ! expA ) { |
| normExpSig = softfloat_normSubnormalExtF80Sig( sigZ ); |
| expZ = normExpSig.exp + 1; |
| sigZ = normExpSig.sig; |
| goto roundAndPack; |
| } |
| expZ = expA; |
| goto shiftRight1; |
| } |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| if ( expDiff < 0 ) { |
| if ( expB == 0x7FFF ) { |
| if ( sigB & UINT64_C( 0x7FFFFFFFFFFFFFFF ) ) goto propagateNaN; |
| uiZ64 = packToExtF80UI64( signZ, 0x7FFF ); |
| uiZ0 = uiB0; |
| goto uiZ; |
| } |
| expZ = expB; |
| if ( ! expA ) { |
| ++expDiff; |
| sigZExtra = 0; |
| if ( ! expDiff ) goto newlyAligned; |
| } |
| sig64Extra = softfloat_shiftRightJam64Extra( sigA, 0, -expDiff ); |
| sigA = sig64Extra.v; |
| sigZExtra = sig64Extra.extra; |
| } else { |
| if ( expA == 0x7FFF ) { |
| if ( sigA & UINT64_C( 0x7FFFFFFFFFFFFFFF ) ) goto propagateNaN; |
| uiZ64 = uiA64; |
| uiZ0 = uiA0; |
| goto uiZ; |
| } |
| expZ = expA; |
| if ( ! expB ) { |
| --expDiff; |
| sigZExtra = 0; |
| if ( ! expDiff ) goto newlyAligned; |
| } |
| sig64Extra = softfloat_shiftRightJam64Extra( sigB, 0, expDiff ); |
| sigB = sig64Extra.v; |
| sigZExtra = sig64Extra.extra; |
| } |
| newlyAligned: |
| sigZ = sigA + sigB; |
| if ( sigZ & UINT64_C( 0x8000000000000000 ) ) goto roundAndPack; |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| shiftRight1: |
| sig64Extra = softfloat_shortShiftRightJam64Extra( sigZ, sigZExtra, 1 ); |
| sigZ = sig64Extra.v | UINT64_C( 0x8000000000000000 ); |
| sigZExtra = sig64Extra.extra; |
| ++expZ; |
| roundAndPack: |
| return |
| softfloat_roundPackToExtF80( |
| signZ, expZ, sigZ, sigZExtra, extF80_roundingPrecision ); |
| /*------------------------------------------------------------------------ |
| *------------------------------------------------------------------------*/ |
| propagateNaN: |
| uiZ = softfloat_propagateNaNExtF80UI( uiA64, uiA0, uiB64, uiB0 ); |
| uiZ64 = uiZ.v64; |
| uiZ0 = uiZ.v0; |
| uiZ: |
| uZ.s.signExp = uiZ64; |
| uZ.s.signif = uiZ0; |
| return uZ.f; |
| |
| } |
| |