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34 lines
843 B
34 lines
843 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 "softfloat.h"
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int_fast32_t f32_to_i32( float32_t a, int_fast8_t roundingMode, 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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bool sign;
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int_fast16_t exp;
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uint_fast32_t sig;
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uint_fast64_t sig64;
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int_fast16_t shiftCount;
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uA.f = a;
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uiA = uA.ui;
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sign = signF32UI( uiA );
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exp = expF32UI( uiA );
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sig = fracF32UI( uiA );
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if ( ( exp == 0xFF ) && sig ) sign = 0;
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if ( exp ) sig |= 0x00800000;
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sig64 = (uint_fast64_t) sig<<32;
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shiftCount = 0xAF - exp;
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if ( 0 < shiftCount ) {
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sig64 = softfloat_shift64RightJam( sig64, shiftCount );
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}
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return softfloat_roundPackToI32( sign, sig64, roundingMode, exact );
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}
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