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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/s_normRoundPackToF32.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/s_normRoundPackToF32.c')
-rw-r--r--[-rwxr-xr-x] | softfloat/s_normRoundPackToF32.c | 84 |
1 files changed, 58 insertions, 26 deletions
diff --git a/softfloat/s_normRoundPackToF32.c b/softfloat/s_normRoundPackToF32.c index 36af4de..28df737 100755..100644 --- a/softfloat/s_normRoundPackToF32.c +++ b/softfloat/s_normRoundPackToF32.c @@ -1,26 +1,58 @@ -// See LICENSE.SoftFloat for license details. - -
-#include <stdbool.h>
-#include <stdint.h>
-#include "platform.h"
-#include "primitives.h"
-#include "internals.h"
-
-float32_t
- softfloat_normRoundPackToF32( bool sign, int_fast16_t exp, uint_fast32_t sig )
-{
- int shiftCount;
- union ui32_f32 uZ;
-
- shiftCount = softfloat_countLeadingZeros32( sig ) - 1;
- exp -= shiftCount;
- if ( ( 7 <= shiftCount ) && ( (uint16_t) exp < 0xFD ) ) {
- uZ.ui = packToF32UI( sign, sig ? exp : 0, sig<<( shiftCount - 7 ) );
- return uZ.f;
- } else {
- return softfloat_roundPackToF32( sign, exp, sig<<shiftCount );
- }
-
-}
-
+ +/*============================================================================ + +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" + +float32_t + softfloat_normRoundPackToF32( bool sign, int_fast16_t exp, uint_fast32_t sig ) +{ + int_fast8_t shiftDist; + union ui32_f32 uZ; + + shiftDist = softfloat_countLeadingZeros32( sig ) - 1; + exp -= shiftDist; + if ( (7 <= shiftDist) && ((unsigned int) exp < 0xFD) ) { + uZ.ui = packToF32UI( sign, sig ? exp : 0, sig<<(shiftDist - 7) ); + return uZ.f; + } else { + return softfloat_roundPackToF32( sign, exp, sig<<shiftDist ); + } + +} + |