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author | Andrew Waterman <andrew@sifive.com> | 2018-07-11 01:16:28 -0700 |
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committer | Andrew Waterman <andrew@sifive.com> | 2018-07-11 01:16:28 -0700 |
commit | 5cd8d2b93fad2011fdf8f49a263d77697af35b32 (patch) | |
tree | f6fb9cb6d3bef2aa5c9903511b92e5a6e99e9519 /softfloat/i64_to_f32.c | |
parent | 8e69141749065ff957383d2112768f95a33429b6 (diff) | |
download | riscv-pk-5cd8d2b93fad2011fdf8f49a263d77697af35b32.zip riscv-pk-5cd8d2b93fad2011fdf8f49a263d77697af35b32.tar.gz riscv-pk-5cd8d2b93fad2011fdf8f49a263d77697af35b32.tar.bz2 |
Upgrade to SoftFloat 3e
Diffstat (limited to 'softfloat/i64_to_f32.c')
-rw-r--r--[-rwxr-xr-x] | softfloat/i64_to_f32.c | 108 |
1 files changed, 70 insertions, 38 deletions
diff --git a/softfloat/i64_to_f32.c b/softfloat/i64_to_f32.c index 6b2d2b8..391e1ae 100755..100644 --- a/softfloat/i64_to_f32.c +++ b/softfloat/i64_to_f32.c @@ -1,38 +1,70 @@ -// See LICENSE.SoftFloat for license details. - -
-#include <stdbool.h>
-#include <stdint.h>
-#include "platform.h"
-#include "primitives.h"
-#include "internals.h"
-#include "softfloat.h"
-
-float32_t i64_to_f32( int_fast64_t a )
-{
- bool sign;
- uint_fast64_t absA;
- int shiftCount;
- union ui32_f32 u;
- uint_fast32_t sig;
-
- sign = ( a < 0 );
- absA = sign ? - (uint_fast64_t) a : a;
- shiftCount = softfloat_countLeadingZeros64( absA ) - 40;
- if ( 0 <= shiftCount ) {
- u.ui =
- a ? packToF32UI(
- sign, 0x95 - shiftCount, (uint_fast32_t) absA<<shiftCount )
- : 0;
- return u.f;
- } else {
- shiftCount += 7;
- sig =
- ( shiftCount < 0 )
- ? softfloat_shortShift64RightJam( absA, - shiftCount )
- : (uint_fast32_t) absA<<shiftCount;
- return softfloat_roundPackToF32( sign, 0x9C - shiftCount, sig );
- }
-
-}
-
+ +/*============================================================================ + +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. + +Redistribution and use in source and binary forms, with or without +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 + and/or other materials provided with the distribution. + + 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 +EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE +DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY +DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +=============================================================================*/ + +#include <stdbool.h> +#include <stdint.h> +#include "platform.h" +#include "internals.h" +#include "softfloat.h" + +float32_t i64_to_f32( int64_t a ) +{ + bool sign; + uint_fast64_t absA; + int_fast8_t shiftDist; + union ui32_f32 u; + uint_fast32_t sig; + + sign = (a < 0); + absA = sign ? -(uint_fast64_t) a : (uint_fast64_t) a; + shiftDist = softfloat_countLeadingZeros64( absA ) - 40; + if ( 0 <= shiftDist ) { + u.ui = + a ? packToF32UI( + sign, 0x95 - shiftDist, (uint_fast32_t) absA<<shiftDist ) + : 0; + return u.f; + } else { + shiftDist += 7; + sig = + (shiftDist < 0) + ? softfloat_shortShiftRightJam64( absA, -shiftDist ) + : (uint_fast32_t) absA<<shiftDist; + return softfloat_roundPackToF32( sign, 0x9C - shiftDist, sig ); + } + +} + |