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43 lines
1004 B
43 lines
1004 B
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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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float32_t f64_to_f32( float64_t a )
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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 sign;
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int_fast16_t exp;
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uint_fast64_t sig;
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uint_fast32_t uiZ, sig32;
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union ui32_f32 uZ;
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uA.f = a;
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uiA = uA.ui;
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sign = signF64UI( uiA );
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exp = expF64UI( uiA );
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sig = fracF64UI( uiA );
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if ( exp == 0x7FF ) {
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uiZ =
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sig ? softfloat_commonNaNToF32UI(
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softfloat_f64UIToCommonNaN( uiA ) )
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: packToF32UI( sign, 0xFF, 0 );
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goto uiZ;
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}
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sig32 = softfloat_shortShift64RightJam( sig, 22 );
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if ( ! ( exp | sig32 ) ) {
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uiZ = packToF32UI( sign, 0, 0 );
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goto uiZ;
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}
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return softfloat_roundPackToF32( sign, exp - 0x381, sig32 | 0x40000000 );
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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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