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43 lines
1.1 KiB
43 lines
1.1 KiB
15 years ago
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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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uint_fast64_t f32_to_ui64( 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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int_fast16_t shiftCount;
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uint_fast64_t sig64, extra;
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struct uint64_extra sig64Extra;
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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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shiftCount = 0xBE - exp;
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if ( shiftCount < 0 ) {
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softfloat_raiseFlags( softfloat_flag_invalid );
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return UINT64_C( 0xFFFFFFFFFFFFFFFF );
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}
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if ( exp ) sig |= 0x00800000;
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sig64 = (uint_fast64_t) sig<<40;
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extra = 0;
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if ( shiftCount ) {
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sig64Extra = softfloat_shift64ExtraRightJam( sig64, 0, shiftCount );
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sig64 = sig64Extra.v;
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extra = sig64Extra.extra;
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}
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return
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softfloat_roundPackToUI64( sign, sig64, extra, roundingMode, exact );
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}
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