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171 lines
5.0 KiB
171 lines
5.0 KiB
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#include <stdbool.h>
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#include <stdint.h>
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#include "platform.h"
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#include "primitives.h"
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#include "internals.h"
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#include "specialize.h"
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#include "softfloat.h"
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float32_t
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softfloat_mulAddF32(
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int op, uint_fast32_t uiA, uint_fast32_t uiB, uint_fast32_t uiC )
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{
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bool signA;
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int_fast16_t expA;
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uint_fast32_t sigA;
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bool signB;
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int_fast16_t expB;
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uint_fast32_t sigB;
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bool signC;
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int_fast16_t expC;
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uint_fast32_t sigC;
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bool signProd;
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uint_fast32_t magBits, uiZ;
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struct exp16_sig32 normExpSig;
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int_fast16_t expProd;
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uint_fast64_t sigProd;
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bool signZ;
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int_fast16_t expZ;
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uint_fast32_t sigZ;
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int_fast16_t expDiff;
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uint_fast64_t sigZ64, sigC64;
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int shiftCount;
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union ui32_f32 uZ;
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signA = signF32UI( uiA );
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expA = expF32UI( uiA );
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sigA = fracF32UI( uiA );
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signB = signF32UI( uiB );
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expB = expF32UI( uiB );
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sigB = fracF32UI( uiB );
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signC = signF32UI( uiC ) ^ ( op == softfloat_mulAdd_subC );
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expC = expF32UI( uiC );
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sigC = fracF32UI( uiC );
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signProd = signA ^ signB ^ ( op == softfloat_mulAdd_subProd );
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if ( expA == 0xFF ) {
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if ( sigA || ( ( expB == 0xFF ) && sigB ) ) goto propagateNaN_ABC;
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magBits = expB | sigB;
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goto infProdArg;
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}
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if ( expB == 0xFF ) {
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if ( sigB ) goto propagateNaN_ABC;
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magBits = expA | sigA;
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goto infProdArg;
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}
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if ( expC == 0xFF ) {
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if ( sigC ) {
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uiZ = 0;
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goto propagateNaN_ZC;
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}
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uiZ = uiC;
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goto uiZ;
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}
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if ( ! expA ) {
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if ( ! sigA ) goto zeroProd;
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normExpSig = softfloat_normSubnormalF32Sig( sigA );
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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 ) goto zeroProd;
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normExpSig = softfloat_normSubnormalF32Sig( sigB );
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expB = normExpSig.exp;
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sigB = normExpSig.sig;
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}
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expProd = expA + expB - 0x7E;
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sigA = ( sigA | 0x00800000 )<<7;
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sigB = ( sigB | 0x00800000 )<<7;
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sigProd = (uint_fast64_t) sigA * sigB;
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if ( sigProd < UINT64_C( 0x2000000000000000 ) ) {
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--expProd;
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sigProd <<= 1;
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}
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signZ = signProd;
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if ( ! expC ) {
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if ( ! sigC ) {
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expZ = expProd - 1;
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sigZ = softfloat_shortShift64RightJam( sigProd, 31 );
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goto roundPack;
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}
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normExpSig = softfloat_normSubnormalF32Sig( sigC );
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expC = normExpSig.exp;
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sigC = normExpSig.sig;
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}
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sigC = ( sigC | 0x00800000 )<<6;
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expDiff = expProd - expC;
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if ( signProd == signC ) {
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if ( expDiff <= 0 ) {
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expZ = expC;
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sigZ = sigC + softfloat_shift64RightJam( sigProd, 32 - expDiff );
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} else {
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expZ = expProd;
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sigZ64 =
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sigProd
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+ softfloat_shift64RightJam(
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(uint_fast64_t) sigC<<32, expDiff );
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sigZ = softfloat_shortShift64RightJam( sigZ64, 32 );
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}
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if ( sigZ < 0x40000000 ) {
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--expZ;
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sigZ <<= 1;
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}
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} else {
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/*** OPTIMIZE BETTER? ***/
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sigC64 = (uint_fast64_t) sigC<<32;
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if ( expDiff < 0 ) {
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signZ = signC;
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expZ = expC;
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sigZ64 = sigC64 - softfloat_shift64RightJam( sigProd, - expDiff );
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} else if ( ! expDiff ) {
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expZ = expProd;
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sigZ64 = sigProd - sigC64;
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if ( ! sigZ64 ) goto completeCancellation;
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if ( sigZ64 & UINT64_C( 0x8000000000000000 ) ) {
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signZ ^= 1;
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sigZ64 = - sigZ64;
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}
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} else {
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expZ = expProd;
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sigZ64 = sigProd - softfloat_shift64RightJam( sigC64, expDiff );
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}
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shiftCount = softfloat_countLeadingZeros64( sigZ64 ) - 1;
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expZ -= shiftCount;
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shiftCount -= 32;
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if ( shiftCount < 0 ) {
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sigZ = softfloat_shortShift64RightJam( sigZ64, - shiftCount );
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} else {
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sigZ = (uint_fast32_t) sigZ64<<shiftCount;
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}
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}
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roundPack:
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return softfloat_roundPackToF32( signZ, expZ, sigZ );
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propagateNaN_ABC:
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uiZ = softfloat_propagateNaNF32UI( uiA, uiB );
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goto propagateNaN_ZC;
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infProdArg:
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if ( magBits ) {
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uiZ = packToF32UI( signProd, 0xFF, 0 );
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if ( expC != 0xFF ) goto uiZ;
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if ( sigC ) goto propagateNaN_ZC;
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if ( signProd == signC ) goto uiZ;
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}
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invalid:
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softfloat_raiseFlags( softfloat_flag_invalid );
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uiZ = defaultNaNF32UI;
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propagateNaN_ZC:
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uiZ = softfloat_propagateNaNF32UI( uiZ, uiC );
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goto uiZ;
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zeroProd:
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uiZ = uiC;
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if ( ! ( expC | sigC ) && ( signProd != signC ) ) {
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completeCancellation:
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uiZ =
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packToF32UI( softfloat_roundingMode == softfloat_round_min, 0, 0 );
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}
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uiZ:
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uZ.ui = uiZ;
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return uZ.f;
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}
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