diff options
Diffstat (limited to 'lib/libutils/isoc/arch/arm/softfloat/source/extF80_mul.c')
| -rw-r--r-- | lib/libutils/isoc/arch/arm/softfloat/source/extF80_mul.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/lib/libutils/isoc/arch/arm/softfloat/source/extF80_mul.c b/lib/libutils/isoc/arch/arm/softfloat/source/extF80_mul.c new file mode 100644 index 0000000..478e867 --- /dev/null +++ b/lib/libutils/isoc/arch/arm/softfloat/source/extF80_mul.c @@ -0,0 +1,158 @@ + +/*============================================================================ + +This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic +Package, Release 3a, by John R. Hauser. + +Copyright 2011, 2012, 2013, 2014 The Regents of the University of California. +All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + + 1. Redistributions of source code must retain the above copyright notice, + this list of conditions, and the following disclaimer. + + 2. Redistributions in binary form must reproduce the above copyright notice, + this list of conditions, and the following disclaimer in the documentation + and/or other materials provided with the distribution. + + 3. Neither the name of the University nor the names of its contributors may + be used to endorse or promote products derived from this software without + specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY +EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE +DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY +DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +=============================================================================*/ + +#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; + +} + |