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31 lines
643 B
31 lines
643 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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float64_t i32_to_f64( int_fast32_t a )
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{
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uint_fast64_t uiZ;
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bool sign;
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uint_fast32_t absA;
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int shiftCount;
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union ui64_f64 uZ;
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if ( ! a ) {
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uiZ = 0;
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} else {
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sign = ( a < 0 );
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absA = sign ? - a : a;
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shiftCount = softfloat_countLeadingZeros32( absA ) + 21;
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uiZ =
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packToF64UI(
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sign, 0x432 - shiftCount, (uint_fast64_t) absA<<shiftCount );
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}
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uZ.ui = uiZ;
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return uZ.f;
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}
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