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// See LICENSE.SoftFloat for license details.
#include <stdbool.h>
#include <stdint.h>
#include "platform.h"
#include "internals.h"
#include "specialize.h"
#include "softfloat.h"
float64_t f32_to_f64( float32_t a )
{
union ui32_f32 uA;
uint_fast32_t uiA;
bool sign;
int_fast16_t exp;
uint_fast32_t sig;
uint_fast64_t uiZ;
struct exp16_sig32 normExpSig;
union ui64_f64 uZ;
uA.f = a;
uiA = uA.ui;
sign = signF32UI( uiA );
exp = expF32UI( uiA );
sig = fracF32UI( uiA );
if ( exp == 0xFF ) {
uiZ =
sig ? softfloat_commonNaNToF64UI(
softfloat_f32UIToCommonNaN( uiA ) )
: packToF64UI( sign, 0x7FF, 0 );
goto uiZ;
}
if ( ! exp ) {
if ( ! sig ) {
uiZ = packToF64UI( sign, 0, 0 );
goto uiZ;
}
normExpSig = softfloat_normSubnormalF32Sig( sig );
exp = normExpSig.exp - 1;
sig = normExpSig.sig;
}
uiZ = packToF64UI( sign, exp + 0x380, (uint_fast64_t) sig<<29 );
uiZ:
uZ.ui = uiZ;
return uZ.f;
}
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