Upgrade to softfloat3e.
This should solve licensing problems as well.
This commit is contained in:
TC1995
332
src/cpu/softfloat3e/f128_mulAdd.cc
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332
src/cpu/softfloat3e/f128_mulAdd.cc
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/*============================================================================
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This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
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Package, Release 3e, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014 The Regents of the University of California.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the University nor the names of its contributors may
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be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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=============================================================================*/
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#include <stdint.h>
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#include "internals.h"
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#include "primitives.h"
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#include "primitiveTypes.h"
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#include "softfloat.h"
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#include "specialize.h"
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float128_t f128_mulAdd(float128_t a, float128_t b, float128_t c, uint8_t op, struct softfloat_status_t *status)
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{
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bool signA;
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int32_t expA;
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struct uint128 sigA;
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bool signB;
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int32_t expB;
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struct uint128 sigB;
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bool signC;
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int32_t expC;
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struct uint128 sigC;
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bool signZ;
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uint64_t magBits;
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struct uint128 uiZ;
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struct exp32_sig128 normExpSig;
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int32_t expZ;
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uint64_t sig256Z[4];
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struct uint128 sigZ;
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int32_t shiftDist, expDiff;
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struct uint128 x128;
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uint64_t sig256C[4];
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static uint64_t zero256[4] = INIT_UINTM4(0, 0, 0, 0);
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uint64_t sigZExtra, sig256Z0;
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uint64_t uiA64, uiA0;
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uint64_t uiB64, uiB0;
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uint64_t uiC64, uiC0;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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uiA64 = a.v64;
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uiA0 = a.v0;
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uiB64 = b.v64;
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uiB0 = b.v0;
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uiC64 = c.v64;
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uiC0 = c.v0;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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signA = signF128UI64(uiA64);
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expA = expF128UI64(uiA64);
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sigA.v64 = fracF128UI64(uiA64);
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sigA.v0 = uiA0;
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signB = signF128UI64(uiB64);
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expB = expF128UI64(uiB64);
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sigB.v64 = fracF128UI64(uiB64);
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sigB.v0 = uiB0;
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signC = signF128UI64(uiC64) ^ ((op & softfloat_mulAdd_subC) != 0);
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expC = expF128UI64(uiC64);
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sigC.v64 = fracF128UI64(uiC64);
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sigC.v0 = uiC0;
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signZ = signA ^ signB ^ ((op & softfloat_mulAdd_subProd) != 0);
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if (expA == 0x7FFF) {
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if ((sigA.v64 | sigA.v0) || ((expB == 0x7FFF) && (sigB.v64 | sigB.v0))) {
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goto propagateNaN_ABC;
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}
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magBits = expB | sigB.v64 | sigB.v0;
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goto infProdArg;
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}
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if (expB == 0x7FFF) {
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if (sigB.v64 | sigB.v0) goto propagateNaN_ABC;
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magBits = expA | sigA.v64 | sigA.v0;
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goto infProdArg;
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}
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if (expC == 0x7FFF) {
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if (sigC.v64 | sigC.v0) {
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uiZ.v64 = 0;
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uiZ.v0 = 0;
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goto propagateNaN_ZC;
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}
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uiZ.v64 = uiC64;
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uiZ.v0 = uiC0;
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return uiZ;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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if (! expA) {
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if (! (sigA.v64 | sigA.v0)) goto zeroProd;
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softfloat_raiseFlags(status, softfloat_flag_denormal);
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normExpSig = softfloat_normSubnormalF128Sig(sigA.v64, sigA.v0);
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expA = normExpSig.exp;
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sigA = normExpSig.sig;
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}
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if (! expB) {
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if (! (sigB.v64 | sigB.v0)) goto zeroProd;
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softfloat_raiseFlags(status, softfloat_flag_denormal);
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normExpSig = softfloat_normSubnormalF128Sig(sigB.v64, sigB.v0);
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expB = normExpSig.exp;
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sigB = normExpSig.sig;
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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expZ = expA + expB - 0x3FFE;
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sigA.v64 |= UINT64_C(0x0001000000000000);
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sigB.v64 |= UINT64_C(0x0001000000000000);
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sigA = softfloat_shortShiftLeft128(sigA.v64, sigA.v0, 8);
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sigB = softfloat_shortShiftLeft128(sigB.v64, sigB.v0, 15);
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softfloat_mul128To256M(sigA.v64, sigA.v0, sigB.v64, sigB.v0, sig256Z);
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sigZ.v64 = sig256Z[indexWord(4, 3)];
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sigZ.v0 = sig256Z[indexWord(4, 2)];
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shiftDist = 0;
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if (! (sigZ.v64 & UINT64_C(0x0100000000000000))) {
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--expZ;
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shiftDist = -1;
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}
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if (! expC) {
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if (! (sigC.v64 | sigC.v0)) {
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shiftDist += 8;
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goto sigZ;
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}
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softfloat_raiseFlags(status, softfloat_flag_denormal);
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normExpSig = softfloat_normSubnormalF128Sig(sigC.v64, sigC.v0);
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expC = normExpSig.exp;
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sigC = normExpSig.sig;
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}
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sigC.v64 |= UINT64_C(0x0001000000000000);
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sigC = softfloat_shortShiftLeft128(sigC.v64, sigC.v0, 8);
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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expDiff = expZ - expC;
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if (expDiff < 0) {
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expZ = expC;
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if ((signZ == signC) || (expDiff < -1)) {
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shiftDist -= expDiff;
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if (shiftDist) {
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sigZ = softfloat_shiftRightJam128(sigZ.v64, sigZ.v0, shiftDist);
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}
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} else {
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if (! shiftDist) {
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x128 = softfloat_shortShiftRight128(sig256Z[indexWord(4, 1)], sig256Z[indexWord(4, 0)], 1);
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sig256Z[indexWord(4, 1)] = (sigZ.v0<<63) | x128.v64;
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sig256Z[indexWord(4, 0)] = x128.v0;
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sigZ = softfloat_shortShiftRight128(sigZ.v64, sigZ.v0, 1);
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sig256Z[indexWord(4, 3)] = sigZ.v64;
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sig256Z[indexWord(4, 2)] = sigZ.v0;
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}
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}
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} else {
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if (shiftDist) softfloat_add256M(sig256Z, sig256Z, sig256Z);
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if (! expDiff) {
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sigZ.v64 = sig256Z[indexWord(4, 3)];
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sigZ.v0 = sig256Z[indexWord(4, 2)];
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} else {
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sig256C[indexWord(4, 3)] = sigC.v64;
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sig256C[indexWord(4, 2)] = sigC.v0;
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sig256C[indexWord(4, 1)] = 0;
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sig256C[indexWord(4, 0)] = 0;
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softfloat_shiftRightJam256M(sig256C, expDiff, sig256C);
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}
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}
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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shiftDist = 8;
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if (signZ == signC) {
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/*--------------------------------------------------------------------
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*--------------------------------------------------------------------*/
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if (expDiff <= 0) {
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sigZ = softfloat_add128(sigC.v64, sigC.v0, sigZ.v64, sigZ.v0);
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} else {
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softfloat_add256M(sig256Z, sig256C, sig256Z);
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sigZ.v64 = sig256Z[indexWord(4, 3)];
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sigZ.v0 = sig256Z[indexWord(4, 2)];
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}
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if (sigZ.v64 & UINT64_C(0x0200000000000000)) {
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++expZ;
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shiftDist = 9;
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}
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} else {
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/*--------------------------------------------------------------------
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*--------------------------------------------------------------------*/
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if (expDiff < 0) {
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signZ = signC;
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if (expDiff < -1) {
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sigZ = softfloat_sub128(sigC.v64, sigC.v0, sigZ.v64, sigZ.v0);
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sigZExtra = sig256Z[indexWord(4, 1)] | sig256Z[indexWord(4, 0)];
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if (sigZExtra) {
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sigZ = softfloat_sub128(sigZ.v64, sigZ.v0, 0, 1);
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}
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if (! (sigZ.v64 & UINT64_C(0x0100000000000000))) {
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--expZ;
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shiftDist = 7;
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}
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goto shiftRightRoundPack;
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} else {
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sig256C[indexWord(4, 3)] = sigC.v64;
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sig256C[indexWord(4, 2)] = sigC.v0;
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sig256C[indexWord(4, 1)] = 0;
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sig256C[indexWord(4, 0)] = 0;
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softfloat_sub256M(sig256C, sig256Z, sig256Z);
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}
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} else if (! expDiff) {
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sigZ = softfloat_sub128(sigZ.v64, sigZ.v0, sigC.v64, sigC.v0);
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if (! (sigZ.v64 | sigZ.v0) && ! sig256Z[indexWord(4, 1)] && ! sig256Z[indexWord(4, 0)]) {
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goto completeCancellation;
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}
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sig256Z[indexWord(4, 3)] = sigZ.v64;
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sig256Z[indexWord(4, 2)] = sigZ.v0;
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if (sigZ.v64 & UINT64_C(0x8000000000000000)) {
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signZ = ! signZ;
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softfloat_sub256M(zero256, sig256Z, sig256Z);
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}
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} else {
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softfloat_sub256M(sig256Z, sig256C, sig256Z);
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if (1 < expDiff) {
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sigZ.v64 = sig256Z[indexWord(4, 3)];
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sigZ.v0 = sig256Z[indexWord(4, 2)];
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if (! (sigZ.v64 & UINT64_C(0x0100000000000000))) {
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--expZ;
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shiftDist = 7;
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}
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goto sigZ;
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}
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}
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/*--------------------------------------------------------------------
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*--------------------------------------------------------------------*/
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sigZ.v64 = sig256Z[indexWord(4, 3)];
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sigZ.v0 = sig256Z[indexWord(4, 2)];
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sigZExtra = sig256Z[indexWord(4, 1)];
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sig256Z0 = sig256Z[indexWord(4, 0)];
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if (sigZ.v64) {
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if (sig256Z0) sigZExtra |= 1;
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} else {
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expZ -= 64;
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sigZ.v64 = sigZ.v0;
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sigZ.v0 = sigZExtra;
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sigZExtra = sig256Z0;
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if (! sigZ.v64) {
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expZ -= 64;
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sigZ.v64 = sigZ.v0;
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sigZ.v0 = sigZExtra;
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sigZExtra = 0;
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if (! sigZ.v64) {
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expZ -= 64;
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sigZ.v64 = sigZ.v0;
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sigZ.v0 = 0;
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}
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}
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}
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shiftDist = softfloat_countLeadingZeros64(sigZ.v64);
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expZ += 7 - shiftDist;
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shiftDist = 15 - shiftDist;
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if (0 < shiftDist) goto shiftRightRoundPack;
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if (shiftDist) {
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shiftDist = -shiftDist;
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sigZ = softfloat_shortShiftLeft128(sigZ.v64, sigZ.v0, shiftDist);
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x128 = softfloat_shortShiftLeft128(0, sigZExtra, shiftDist);
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sigZ.v0 |= x128.v64;
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sigZExtra = x128.v0;
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}
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goto roundPack;
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}
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sigZ:
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sigZExtra = sig256Z[indexWord(4, 1)] | sig256Z[indexWord(4, 0)];
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shiftRightRoundPack:
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sigZExtra = (uint64_t) (sigZ.v0<<(64 - shiftDist)) | (sigZExtra != 0);
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sigZ = softfloat_shortShiftRight128(sigZ.v64, sigZ.v0, shiftDist);
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roundPack:
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return softfloat_roundPackToF128(signZ, expZ - 1, sigZ.v64, sigZ.v0, sigZExtra, status);
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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propagateNaN_ABC:
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uiZ = softfloat_propagateNaNF128UI(uiA64, uiA0, uiB64, uiB0, status);
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goto propagateNaN_ZC;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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infProdArg:
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if ((sigC.v64 | sigC.v0) && expC == 0x7FFF) goto propagateNaN_ZC;
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if (magBits) {
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uiZ.v64 = packToF128UI64(signZ, 0x7FFF, 0);
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uiZ.v0 = 0;
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if (expC != 0x7FFF) return uiZ;
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if (signZ == signC) return uiZ;
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}
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softfloat_raiseFlags(status, softfloat_flag_invalid);
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uiZ.v64 = defaultNaNF128UI64;
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uiZ.v0 = defaultNaNF128UI0;
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propagateNaN_ZC:
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uiZ = softfloat_propagateNaNF128UI(uiZ.v64, uiZ.v0, uiC64, uiC0, status);
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return uiZ;
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/*------------------------------------------------------------------------
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*------------------------------------------------------------------------*/
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zeroProd:
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uiZ.v64 = uiC64;
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uiZ.v0 = uiC0;
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if (! (expC | sigC.v64 | sigC.v0) && (signZ != signC)) {
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completeCancellation:
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uiZ.v64 = packToF128UI64((softfloat_getRoundingMode(status) == softfloat_round_min), 0, 0);
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uiZ.v0 = 0;
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}
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return uiZ;
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}
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