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i32_to_f64.c
Go to the documentation of this file.
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/*============================================================================
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This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
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Package, Release 3e, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of
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California. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the University nor the names of its contributors may
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be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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=============================================================================*/
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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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float64_t
i32_to_f64
(
int32_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_fast8_t
shiftDist;
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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 ? -(
uint_fast32_t
)
a
: (
uint_fast32_t
)
a
;
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shiftDist =
softfloat_countLeadingZeros32
( absA ) + 21;
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uiZ =
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packToF64UI
(
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sign, 0x432 - shiftDist, (
uint_fast64_t
) absA<<shiftDist );
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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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a
const GenericPointer< typename T::ValueType > T2 T::AllocatorType & a
Definition
pointer.h:1181
i32_to_f64
float64_t i32_to_f64(int32_t a)
Definition
i32_to_f64.c:43
packToF64UI
#define packToF64UI(sign, exp, sig)
Definition
internals.h:128
softfloat_countLeadingZeros32
#define softfloat_countLeadingZeros32
Definition
s_countLeadingZeros32.c:42
stdint.h
uint_fast64_t
uint64_t uint_fast64_t
Definition
stdint.h:157
int_fast8_t
int8_t int_fast8_t
Definition
stdint.h:150
uint_fast32_t
uint32_t uint_fast32_t
Definition
stdint.h:156
int32_t
signed int int32_t
Definition
stdint.h:123
float64_t
Definition
softfloat_types.h:52
ui64_f64
Definition
internals.h:47
ui64_f64::f
float64_t f
Definition
internals.h:47
ui64_f64::ui
uint64_t ui
Definition
internals.h:47
libraries
softfloat
source
i32_to_f64.c
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