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author | 2018-05-13 19:52:33 -0400 | |
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committer | 2018-05-13 19:52:33 -0400 | |
commit | 62be291842be67be394942ca6ec8fa835dac858e (patch) | |
tree | 8ccd05b60ddb376c73008567794fa500fbbd5783 /3rdparty/softfloat3/source/f32_to_i32_r_minMag.c | |
parent | a65fccc1f54f4aba9324e97a26f919d5fa1a244b (diff) |
Initial import of SoftFloat release 3E [R. Belmont]
This is a pre-usage import so everyone can get things in line for various compilers. GCC/Clang should be OK on most targets as-is;
MSVC may need to edit 3rdparty/softfloat3/build/MAME/build.h to conform. Please report failure/success with various compilers.
Diffstat (limited to '3rdparty/softfloat3/source/f32_to_i32_r_minMag.c')
-rw-r--r-- | 3rdparty/softfloat3/source/f32_to_i32_r_minMag.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/3rdparty/softfloat3/source/f32_to_i32_r_minMag.c b/3rdparty/softfloat3/source/f32_to_i32_r_minMag.c new file mode 100644 index 00000000000..f8134f461f7 --- /dev/null +++ b/3rdparty/softfloat3/source/f32_to_i32_r_minMag.c @@ -0,0 +1,89 @@ + +/*============================================================================ + +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 "specialize.h" +#include "softfloat.h" + +int_fast32_t f32_to_i32_r_minMag( float32_t a, bool exact ) +{ + union ui32_f32 uA; + uint_fast32_t uiA; + int_fast16_t exp; + uint_fast32_t sig; + int_fast16_t shiftDist; + bool sign; + int_fast32_t absZ; + + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + uA.f = a; + uiA = uA.ui; + exp = expF32UI( uiA ); + sig = fracF32UI( uiA ); + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + shiftDist = 0x9E - exp; + if ( 32 <= shiftDist ) { + if ( exact && (exp | sig) ) { + softfloat_exceptionFlags |= softfloat_flag_inexact; + } + return 0; + } + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + sign = signF32UI( uiA ); + if ( shiftDist <= 0 ) { + if ( uiA == packToF32UI( 1, 0x9E, 0 ) ) return -0x7FFFFFFF - 1; + softfloat_raiseFlags( softfloat_flag_invalid ); + return + (exp == 0xFF) && sig ? i32_fromNaN + : sign ? i32_fromNegOverflow : i32_fromPosOverflow; + } + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + sig = (sig | 0x00800000)<<8; + absZ = sig>>shiftDist; + if ( exact && ((uint_fast32_t) absZ<<shiftDist != sig) ) { + softfloat_exceptionFlags |= softfloat_flag_inexact; + } + return sign ? -absZ : absZ; + +} + |