From f215e02bf85f68d3a6106c2a1f4f7f063f819064 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:17:27 +0200 Subject: Adding upstream version 7.0.14-dfsg. Signed-off-by: Daniel Baumann --- src/libs/softfloat-3e/source/f128_div.c | 199 ++++++++++++++++++++++++++++++++ 1 file changed, 199 insertions(+) create mode 100644 src/libs/softfloat-3e/source/f128_div.c (limited to 'src/libs/softfloat-3e/source/f128_div.c') diff --git a/src/libs/softfloat-3e/source/f128_div.c b/src/libs/softfloat-3e/source/f128_div.c new file mode 100644 index 00000000..b550ca1f --- /dev/null +++ b/src/libs/softfloat-3e/source/f128_div.c @@ -0,0 +1,199 @@ + +/*============================================================================ + +This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic +Package, Release 3e, 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 +#include +#include "platform.h" +#include "internals.h" +#include "specialize.h" +#include "softfloat.h" + +float128_t f128_div( float128_t a, float128_t b SOFTFLOAT_STATE_DECL_COMMA ) +{ + union ui128_f128 uA; + uint_fast64_t uiA64, uiA0; + bool signA; + int_fast32_t expA; + struct uint128 sigA; + union ui128_f128 uB; + uint_fast64_t uiB64, uiB0; + bool signB; + int_fast32_t expB; + struct uint128 sigB; + bool signZ; + struct exp32_sig128 normExpSig; + int_fast32_t expZ; + struct uint128 rem; + uint_fast32_t recip32; + int ix; + uint_fast64_t q64; + uint_fast32_t q; + struct uint128 term; + uint_fast32_t qs[3]; + uint_fast64_t sigZExtra; + struct uint128 sigZ, uiZ; + union ui128_f128 uZ; + + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + uA.f = a; + uiA64 = uA.ui.v64; + uiA0 = uA.ui.v0; + signA = signF128UI64( uiA64 ); + expA = expF128UI64( uiA64 ); + sigA.v64 = fracF128UI64( uiA64 ); + sigA.v0 = uiA0; + uB.f = b; + uiB64 = uB.ui.v64; + uiB0 = uB.ui.v0; + signB = signF128UI64( uiB64 ); + expB = expF128UI64( uiB64 ); + sigB.v64 = fracF128UI64( uiB64 ); + sigB.v0 = uiB0; + signZ = signA ^ signB; + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + if ( expA == 0x7FFF ) { + if ( sigA.v64 | sigA.v0 ) goto propagateNaN; + if ( expB == 0x7FFF ) { + if ( sigB.v64 | sigB.v0 ) goto propagateNaN; + goto invalid; + } + goto infinity; + } + if ( expB == 0x7FFF ) { + if ( sigB.v64 | sigB.v0 ) goto propagateNaN; + goto zero; + } + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + if ( ! expB ) { + if ( ! (sigB.v64 | sigB.v0) ) { + if ( ! (expA | sigA.v64 | sigA.v0) ) goto invalid; + softfloat_raiseFlags( softfloat_flag_infinite SOFTFLOAT_STATE_ARG_COMMA ); + goto infinity; + } + normExpSig = softfloat_normSubnormalF128Sig( sigB.v64, sigB.v0 ); + expB = normExpSig.exp; + sigB = normExpSig.sig; + } + if ( ! expA ) { + if ( ! (sigA.v64 | sigA.v0) ) goto zero; + normExpSig = softfloat_normSubnormalF128Sig( sigA.v64, sigA.v0 ); + expA = normExpSig.exp; + sigA = normExpSig.sig; + } + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + expZ = expA - expB + 0x3FFE; + sigA.v64 |= UINT64_C( 0x0001000000000000 ); + sigB.v64 |= UINT64_C( 0x0001000000000000 ); + rem = sigA; + if ( softfloat_lt128( sigA.v64, sigA.v0, sigB.v64, sigB.v0 ) ) { + --expZ; + rem = softfloat_add128( sigA.v64, sigA.v0, sigA.v64, sigA.v0 ); + } + recip32 = softfloat_approxRecip32_1( sigB.v64>>17 ); + ix = 3; + for (;;) { + q64 = (uint_fast64_t) (uint32_t) (rem.v64>>19) * recip32; + q = (q64 + 0x80000000)>>32; + --ix; + if ( ix < 0 ) break; + rem = softfloat_shortShiftLeft128( rem.v64, rem.v0, 29 ); + term = softfloat_mul128By32( sigB.v64, sigB.v0, q ); + rem = softfloat_sub128( rem.v64, rem.v0, term.v64, term.v0 ); + if ( rem.v64 & UINT64_C( 0x8000000000000000 ) ) { + --q; + rem = softfloat_add128( rem.v64, rem.v0, sigB.v64, sigB.v0 ); + } + qs[ix] = q; + } + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + if ( ((q + 1) & 7) < 2 ) { + rem = softfloat_shortShiftLeft128( rem.v64, rem.v0, 29 ); + term = softfloat_mul128By32( sigB.v64, sigB.v0, q ); + rem = softfloat_sub128( rem.v64, rem.v0, term.v64, term.v0 ); + if ( rem.v64 & UINT64_C( 0x8000000000000000 ) ) { + --q; + rem = softfloat_add128( rem.v64, rem.v0, sigB.v64, sigB.v0 ); + } else if ( softfloat_le128( sigB.v64, sigB.v0, rem.v64, rem.v0 ) ) { + ++q; + rem = softfloat_sub128( rem.v64, rem.v0, sigB.v64, sigB.v0 ); + } + if ( rem.v64 | rem.v0 ) q |= 1; + } + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + sigZExtra = (uint64_t) ((uint_fast64_t) q<<60); + term = softfloat_shortShiftLeft128( 0, qs[1], 54 ); + sigZ = + softfloat_add128( + (uint_fast64_t) qs[2]<<19, ((uint_fast64_t) qs[0]<<25) + (q>>4), + term.v64, term.v0 + ); + return + softfloat_roundPackToF128( signZ, expZ, sigZ.v64, sigZ.v0, sigZExtra SOFTFLOAT_STATE_ARG_COMMA ); + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + propagateNaN: + uiZ = softfloat_propagateNaNF128UI( uiA64, uiA0, uiB64, uiB0 SOFTFLOAT_STATE_ARG_COMMA ); + goto uiZ; + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + invalid: + softfloat_raiseFlags( softfloat_flag_invalid SOFTFLOAT_STATE_ARG_COMMA ); + uiZ.v64 = defaultNaNF128UI64; + uiZ.v0 = defaultNaNF128UI0; + goto uiZ; + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + infinity: + uiZ.v64 = packToF128UI64( signZ, 0x7FFF, 0 ); + goto uiZ0; + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + zero: + uiZ.v64 = packToF128UI64( signZ, 0, 0 ); + uiZ0: + uiZ.v0 = 0; + uiZ: + uZ.ui = uiZ; + return uZ.f; + +} + -- cgit v1.2.3