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/s_subMagsF128.c | 140 +++++++++++++++++++++++++++ 1 file changed, 140 insertions(+) create mode 100644 src/libs/softfloat-3e/source/s_subMagsF128.c (limited to 'src/libs/softfloat-3e/source/s_subMagsF128.c') diff --git a/src/libs/softfloat-3e/source/s_subMagsF128.c b/src/libs/softfloat-3e/source/s_subMagsF128.c new file mode 100644 index 00000000..5382d0fa --- /dev/null +++ b/src/libs/softfloat-3e/source/s_subMagsF128.c @@ -0,0 +1,140 @@ + +/*============================================================================ + +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, 2015 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 + softfloat_subMagsF128( + uint_fast64_t uiA64, + uint_fast64_t uiA0, + uint_fast64_t uiB64, + uint_fast64_t uiB0, + bool signZ + SOFTFLOAT_STATE_DECL_COMMA + ) +{ + int_fast32_t expA; + struct uint128 sigA; + int_fast32_t expB; + struct uint128 sigB, sigZ; + int_fast32_t expDiff, expZ; + struct uint128 uiZ; + union ui128_f128 uZ; + + expA = expF128UI64( uiA64 ); + sigA.v64 = fracF128UI64( uiA64 ); + sigA.v0 = uiA0; + expB = expF128UI64( uiB64 ); + sigB.v64 = fracF128UI64( uiB64 ); + sigB.v0 = uiB0; + sigA = softfloat_shortShiftLeft128( sigA.v64, sigA.v0, 4 ); + sigB = softfloat_shortShiftLeft128( sigB.v64, sigB.v0, 4 ); + expDiff = expA - expB; + if ( 0 < expDiff ) goto expABigger; + if ( expDiff < 0 ) goto expBBigger; + if ( expA == 0x7FFF ) { + if ( sigA.v64 | sigA.v0 | sigB.v64 | sigB.v0 ) goto propagateNaN; + softfloat_raiseFlags( softfloat_flag_invalid SOFTFLOAT_STATE_ARG_COMMA ); + uiZ.v64 = defaultNaNF128UI64; + uiZ.v0 = defaultNaNF128UI0; + goto uiZ; + } + expZ = expA; + if ( ! expZ ) expZ = 1; + if ( sigB.v64 < sigA.v64 ) goto aBigger; + if ( sigA.v64 < sigB.v64 ) goto bBigger; + if ( sigB.v0 < sigA.v0 ) goto aBigger; + if ( sigA.v0 < sigB.v0 ) goto bBigger; + uiZ.v64 = + packToF128UI64( + (softfloat_roundingMode == softfloat_round_min), 0, 0 ); + uiZ.v0 = 0; + goto uiZ; + expBBigger: + if ( expB == 0x7FFF ) { + if ( sigB.v64 | sigB.v0 ) goto propagateNaN; + uiZ.v64 = packToF128UI64( signZ ^ 1, 0x7FFF, 0 ); + uiZ.v0 = 0; + goto uiZ; + } + if ( expA ) { + sigA.v64 |= UINT64_C( 0x0010000000000000 ); + } else { + ++expDiff; + if ( ! expDiff ) goto newlyAlignedBBigger; + } + sigA = softfloat_shiftRightJam128( sigA.v64, sigA.v0, -expDiff ); + newlyAlignedBBigger: + expZ = expB; + sigB.v64 |= UINT64_C( 0x0010000000000000 ); + bBigger: + signZ = ! signZ; + sigZ = softfloat_sub128( sigB.v64, sigB.v0, sigA.v64, sigA.v0 ); + goto normRoundPack; + expABigger: + if ( expA == 0x7FFF ) { + if ( sigA.v64 | sigA.v0 ) goto propagateNaN; + uiZ.v64 = uiA64; + uiZ.v0 = uiA0; + goto uiZ; + } + if ( expB ) { + sigB.v64 |= UINT64_C( 0x0010000000000000 ); + } else { + --expDiff; + if ( ! expDiff ) goto newlyAlignedABigger; + } + sigB = softfloat_shiftRightJam128( sigB.v64, sigB.v0, expDiff ); + newlyAlignedABigger: + expZ = expA; + sigA.v64 |= UINT64_C( 0x0010000000000000 ); + aBigger: + sigZ = softfloat_sub128( sigA.v64, sigA.v0, sigB.v64, sigB.v0 ); + normRoundPack: + return softfloat_normRoundPackToF128( signZ, expZ - 5, sigZ.v64, sigZ.v0 SOFTFLOAT_STATE_ARG_COMMA ); + propagateNaN: + uiZ = softfloat_propagateNaNF128UI( uiA64, uiA0, uiB64, uiB0 SOFTFLOAT_STATE_ARG_COMMA ); + uiZ: + uZ.ui = uiZ; + return uZ.f; + +} + -- cgit v1.2.3