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91 lines
2.3 KiB
91 lines
2.3 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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float64_t f64_mul( float64_t a, float64_t b )
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{
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union ui64_f64 uA;
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uint_fast64_t uiA;
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bool signA;
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int_fast16_t expA;
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uint_fast64_t sigA;
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union ui64_f64 uB;
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uint_fast64_t uiB;
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bool signB;
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int_fast16_t expB;
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uint_fast64_t sigB;
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bool signZ;
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uint_fast64_t magBits;
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struct exp16_sig64 normExpSig;
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int_fast16_t expZ;
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struct uint128 sigZ128;
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uint_fast64_t sigZ, uiZ;
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union ui64_f64 uZ;
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uA.f = a;
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uiA = uA.ui;
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signA = signF64UI( uiA );
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expA = expF64UI( uiA );
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sigA = fracF64UI( uiA );
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uB.f = b;
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uiB = uB.ui;
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signB = signF64UI( uiB );
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expB = expF64UI( uiB );
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sigB = fracF64UI( uiB );
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signZ = signA ^ signB;
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if ( expA == 0x7FF ) {
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if ( sigA || ( ( expB == 0x7FF ) && sigB ) ) goto propagateNaN;
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magBits = expB | sigB;
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goto infArg;
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}
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if ( expB == 0x7FF ) {
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if ( sigB ) goto propagateNaN;
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magBits = expA | sigA;
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goto infArg;
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}
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if ( ! expA ) {
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if ( ! sigA ) goto zero;
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normExpSig = softfloat_normSubnormalF64Sig( 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 zero;
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normExpSig = softfloat_normSubnormalF64Sig( sigB );
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expB = normExpSig.exp;
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sigB = normExpSig.sig;
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}
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expZ = expA + expB - 0x3FF;
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sigA = ( sigA | UINT64_C( 0x0010000000000000 ) )<<10;
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sigB = ( sigB | UINT64_C( 0x0010000000000000 ) )<<11;
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sigZ128 = softfloat_mul64To128( sigA, sigB );
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sigZ = sigZ128.v64 | ( sigZ128.v0 != 0 );
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if ( sigZ < UINT64_C( 0x4000000000000000 ) ) {
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--expZ;
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sigZ <<= 1;
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}
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return softfloat_roundPackToF64( signZ, expZ, sigZ );
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propagateNaN:
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uiZ = softfloat_propagateNaNF64UI( uiA, uiB );
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goto uiZ;
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infArg:
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if ( ! magBits ) {
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softfloat_raiseFlags( softfloat_flag_invalid );
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uiZ = defaultNaNF64UI;
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} else {
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uiZ = packToF64UI( signZ, 0x7FF, 0 );
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}
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goto uiZ;
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zero:
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uiZ = packToF64UI( signZ, 0, 0 );
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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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