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#include <stdbool.h>
#include <stdint.h>
#include "platform.h"
#include "internals.h"
#include "softfloat.h"
int_fast64_t f32_to_i64_r_minMag( float32_t a, bool exact )
{
union ui32_f32 uA;
uint_fast32_t uiA;
int_fast16_t exp;
uint_fast32_t sig;
bool sign;
int_fast16_t shiftCount;
uint_fast64_t sig64;
int_fast64_t absZ;
uA.f = a;
uiA = uA.ui;
exp = expF32UI( uiA );
sig = fracF32UI( uiA );
if ( exp < 0x7F ) {
if ( exact && ( exp | sig ) ) {
softfloat_raiseFlags( softfloat_flag_inexact );
}
return 0;
}
sign = signF32UI( uiA );
shiftCount = 0xBE - exp;
if ( shiftCount <= 0 ) {
if ( uiA != packToF32UI( 1, 0xBE, 0 ) ) {
softfloat_raiseFlags( softfloat_flag_invalid );
if ( ! sign || ( ( exp == 0xFF ) && sig ) ) {
return INT64_C( 0x7FFFFFFFFFFFFFFF );
}
}
return - INT64_C( 0x7FFFFFFFFFFFFFFF ) - 1;
}
sig |= 0x00800000;
sig64 = (uint_fast64_t) sig<<40;
absZ = sig64>>shiftCount;
shiftCount = 40 - shiftCount;
if (
exact && ( shiftCount < 0 ) && (uint32_t) ( sig<<( shiftCount & 31 ) )
) {
softfloat_raiseFlags( softfloat_flag_inexact );
}
return sign ? - absZ : absZ;
}
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