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Diffstat (limited to 'softfloat/i32_to_f128.c')
-rw-r--r-- | softfloat/i32_to_f128.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/softfloat/i32_to_f128.c b/softfloat/i32_to_f128.c new file mode 100644 index 0000000..af7268a --- /dev/null +++ b/softfloat/i32_to_f128.c @@ -0,0 +1,64 @@ + +/*============================================================================ + +This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic +Package, Release 3d, 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 <stdint.h> +#include "platform.h" +#include "internals.h" +#include "softfloat.h" + +float128_t i32_to_f128( int32_t a ) +{ + uint_fast64_t uiZ64; + bool sign; + uint_fast32_t absA; + int_fast8_t shiftDist; + union ui128_f128 uZ; + + uiZ64 = 0; + if ( a ) { + sign = (a < 0); + absA = sign ? -(uint_fast32_t) a : (uint_fast32_t) a; + shiftDist = softfloat_countLeadingZeros32( absA ) + 17; + uiZ64 = + packToF128UI64( + sign, 0x402E - shiftDist, (uint_fast64_t) absA<<shiftDist ); + } + uZ.ui.v64 = uiZ64; + uZ.ui.v0 = 0; + return uZ.f; + +} + |