i32_to_extF80.c

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/*============================================================================
 
This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
Package, Release 3e, by John R. Hauser.
 
Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of
California.  All rights reserved.
 
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modification, are permitted provided that the following conditions are met:
 
 1. Redistributions of source code must retain the above copyright notice,
    this list of conditions, and the following disclaimer.
 
 2. Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions, and the following disclaimer in the documentation
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 3. Neither the name of the University nor the names of its contributors may
    be used to endorse or promote products derived from this software without
    specific prior written permission.
 
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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=============================================================================*/
 
#include <stdbool.h>
#include <stdint.h>
#include "platform.h"
#include "internals.h"
#include "softfloat.h"
 
extFloat80_t i32_to_extF80( int32_t a )
{
    uint_fast16_t uiZ64;
    uint_fast32_t absA;
    bool sign;
    int_fast8_t shiftDist;
    union { struct extFloat80M s; extFloat80_t f; } uZ;
 
    uiZ64 = 0;
    absA = 0;
    if ( a ) {
        sign = (a < 0);
        absA = sign ? -(uint_fast32_t) a : (uint_fast32_t) a;
        shiftDist = softfloat_countLeadingZeros32( absA );
        uiZ64 = packToExtF80UI64( sign, 0x401E - shiftDist );
        absA <<= shiftDist;
    }
    uZ.s.signExp = uiZ64;
    uZ.s.signif = (uint_fast64_t) absA<<32;
    return uZ.f;
 
}