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45 lines
1.1 KiB
45 lines
1.1 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 f32_to_i32_r_minMag( float32_t a, bool exact )
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{
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union ui32_f32 uA;
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uint_fast32_t uiA;
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int_fast16_t exp;
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uint_fast32_t sig;
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bool sign;
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int_fast16_t shiftCount;
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int_fast32_t absZ;
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uA.f = a;
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uiA = uA.ui;
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exp = expF32UI( uiA );
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sig = fracF32UI( uiA );
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if ( exp < 0x7F ) {
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if ( exact && ( exp | sig ) ) {
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softfloat_raiseFlags( softfloat_flag_inexact );
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}
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return 0;
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}
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sign = signF32UI( uiA );
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shiftCount = 0x9E - exp;
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if ( shiftCount <= 0 ) {
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if ( uiA != packToF32UI( 1, 0x9E, 0 ) ) {
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softfloat_raiseFlags( softfloat_flag_invalid );
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if ( ! sign || ( ( exp == 0xFF ) && sig ) ) return 0x7FFFFFFF;
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}
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return -0x7FFFFFFF - 1;
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}
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sig = ( sig | 0x00800000 )<<8;
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absZ = sig>>shiftCount;
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if ( exact && (uint32_t) ( sig<<( ( - shiftCount ) & 31 ) ) ) {
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softfloat_raiseFlags( softfloat_flag_inexact );
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}
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return sign ? - absZ : absZ;
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}
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