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50 lines
1.2 KiB
50 lines
1.2 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 "internals.h"
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#include "softfloat.h"
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int_fast32_t f64_to_i32_r_minMag( float64_t a, bool exact )
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{
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union ui64_f64 uA;
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uint_fast64_t uiA;
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int_fast16_t exp;
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uint_fast64_t sig;
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bool sign;
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int_fast16_t shiftCount;
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uint_fast32_t absZ;
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union { uint32_t ui; int32_t i; } uZ;
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int_fast32_t z;
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uA.f = a;
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uiA = uA.ui;
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exp = expF64UI( uiA );
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sig = fracF64UI( uiA );
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if ( exp < 0x3FF ) {
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if ( exact && ( exp | sig ) ) {
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softfloat_exceptionFlags |= softfloat_flag_inexact;
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}
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return 0;
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}
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sign = signF64UI( uiA );
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if ( 0x41E < exp ) {
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if ( ( exp == 0x7FF ) && sig ) sign = 0;
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goto invalid;
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}
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sig |= UINT64_C( 0x0010000000000000 );
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shiftCount = 0x433 - exp;
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absZ = sig>>shiftCount;
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uZ.ui = sign ? - absZ : absZ;
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z = uZ.i;
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if ( ( z < 0 ) != sign ) goto invalid;
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if ( exact && ( (uint_fast64_t) absZ<<shiftCount != sig ) ) {
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softfloat_exceptionFlags |= softfloat_flag_inexact;
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}
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return z;
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invalid:
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softfloat_raiseFlags( softfloat_flag_invalid );
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return sign ? -0x7FFFFFFF - 1 : 0x7FFFFFFF;
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}
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