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104 lines
2.6 KiB
104 lines
2.6 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_div( 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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struct exp16_sig64 normExpSig;
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int_fast16_t expZ;
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uint_fast64_t sigZ;
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struct uint128 term, rem;
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uint_fast64_t 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 ) goto propagateNaN;
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if ( expB == 0x7FF ) {
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if ( sigB ) goto propagateNaN;
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goto invalid;
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}
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goto infinity;
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}
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if ( expB == 0x7FF ) {
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if ( sigB ) goto propagateNaN;
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goto zero;
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}
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if ( ! expB ) {
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if ( ! sigB ) {
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if ( ! ( expA | sigA ) ) goto invalid;
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softfloat_raiseFlags( softfloat_flag_infinity );
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goto infinity;
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}
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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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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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expZ = expA - expB + 0x3FD;
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sigA = ( sigA | UINT64_C( 0x0010000000000000 ) )<<10;
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sigB = ( sigB | UINT64_C( 0x0010000000000000 ) )<<11;
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if ( sigB <= ( sigA + sigA ) ) {
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++expZ;
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sigA >>= 1;
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}
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sigZ = softfloat_estimateDiv128To64( sigA, 0, sigB );
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if ( ( sigZ & 0x1FF ) <= 2 ) {
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term = softfloat_mul64To128( sigB, sigZ );
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rem = softfloat_sub128( sigA, 0, term.v64, term.v0 );
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while ( UINT64_C( 0x8000000000000000 ) <= rem.v64 ) {
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--sigZ;
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rem = softfloat_add128( rem.v64, rem.v0, 0, sigB );
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}
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sigZ |= ( rem.v0 != 0 );
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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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invalid:
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softfloat_raiseFlags( softfloat_flag_invalid );
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uiZ = defaultNaNF64UI;
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goto uiZ;
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infinity:
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uiZ = packToF64UI( signZ, 0x7FF, 0 );
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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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