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52 lines
1.3 KiB
52 lines
1.3 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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int_fast64_t f32_to_i64_r_minMag( float32_t a, 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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int_fast16_t exp;
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uint_fast32_t sig;
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bool sign;
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int_fast16_t shiftCount;
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uint_fast64_t sig64;
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int_fast64_t absZ;
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uA.f = a;
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uiA = uA.ui;
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exp = expF32UI( uiA );
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sig = fracF32UI( uiA );
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if ( exp < 0x7F ) {
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if ( exact && ( exp | sig ) ) {
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softfloat_exceptionFlags |= softfloat_flag_inexact;
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}
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return 0;
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}
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sign = signF32UI( uiA );
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shiftCount = 0xBE - exp;
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if ( shiftCount <= 0 ) {
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if ( uiA != packToF32UI( 1, 0xBE, 0 ) ) {
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softfloat_raiseFlags( softfloat_flag_invalid );
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if ( ! sign || ( ( exp == 0xFF ) && sig ) ) {
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return INT64_C( 0x7FFFFFFFFFFFFFFF );
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}
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}
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return - INT64_C( 0x7FFFFFFFFFFFFFFF ) - 1;
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}
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sig |= 0x00800000;
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sig64 = (uint_fast64_t) sig<<40;
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absZ = sig64>>shiftCount;
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shiftCount = 40 - shiftCount;
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if (
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exact && ( shiftCount < 0 ) && (uint32_t) ( sig<<( shiftCount & 31 ) )
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) {
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softfloat_exceptionFlags |= softfloat_flag_inexact;
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}
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return sign ? - absZ : absZ;
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}
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