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44 lines
1.2 KiB
44 lines
1.2 KiB
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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 "internals.h"
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#include "softfloat.h"
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uint_fast32_t
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softfloat_roundPackToUI32(
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bool sign, uint_fast64_t sig, int_fast8_t roundingMode, bool exact )
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{
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bool roundNearestEven;
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int roundIncrement, roundBits;
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uint_fast32_t z;
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roundNearestEven = ( roundingMode == softfloat_round_nearest_even );
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roundIncrement = 0x40;
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if (
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! roundNearestEven
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&& ( roundingMode != softfloat_round_nearest_maxMag )
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) {
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roundIncrement =
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( roundingMode == softfloat_round_minMag )
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|| ( roundingMode
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== ( sign ? softfloat_round_max : softfloat_round_min ) )
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? 0
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: 0x7F;
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}
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roundBits = sig & 0x7F;
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sig += roundIncrement;
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if ( sig & UINT64_C( 0xFFFFFF8000000000 ) ) goto invalid;
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z = sig>>7;
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z &= ~ ( ! ( roundBits ^ 0x40 ) & roundNearestEven );
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if ( sign && z ) goto invalid;
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if ( exact && roundBits ) {
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softfloat_exceptionFlags |= softfloat_flag_inexact;
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}
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return z;
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invalid:
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softfloat_raiseFlags( softfloat_flag_invalid );
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return 0xFFFFFFFF;
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}
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