| |
| /*============================================================================ |
| |
| This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic |
| Package, Release 3, by John R. Hauser. |
| |
| Copyright 2011, 2012, 2013, 2014 The Regents of the University of California |
| (Regents). All Rights Reserved. Redistribution and use in source and binary |
| forms, with or without modification, are permitted provided that the following |
| conditions are met: |
| |
| Redistributions of source code must retain the above copyright notice, |
| this list of conditions, and the following two paragraphs of disclaimer. |
| Redistributions in binary form must reproduce the above copyright notice, |
| this list of conditions, and the following two paragraphs of disclaimer in the |
| documentation and/or other materials provided with the distribution. Neither |
| the name of the Regents nor the names of its contributors may be used to |
| endorse or promote products derived from this software without specific prior |
| written permission. |
| |
| IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, |
| SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING |
| OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS |
| BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED |
| TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED |
| HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE |
| MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
| |
| =============================================================================*/ |
| |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include "platform.h" |
| #include "internals.h" |
| #include "specialize.h" |
| #include "softfloat.h" |
| |
| float64_t f32_to_f64( float32_t a ) |
| { |
| union ui32_f32 uA; |
| uint_fast32_t uiA; |
| bool sign; |
| int_fast16_t exp; |
| uint_fast32_t sig; |
| struct commonNaN commonNaN; |
| uint_fast64_t uiZ; |
| struct exp16_sig32 normExpSig; |
| union ui64_f64 uZ; |
| |
| uA.f = a; |
| uiA = uA.ui; |
| sign = signF32UI( uiA ); |
| exp = expF32UI( uiA ); |
| sig = fracF32UI( uiA ); |
| if ( exp == 0xFF ) { |
| if ( sig ) { |
| softfloat_f32UIToCommonNaN( uiA, &commonNaN ); |
| uiZ = softfloat_commonNaNToF64UI( &commonNaN ); |
| } else { |
| uiZ = packToF64UI( sign, 0x7FF, 0 ); |
| } |
| goto uiZ; |
| } |
| if ( ! exp ) { |
| if ( ! sig ) { |
| uiZ = packToF64UI( sign, 0, 0 ); |
| goto uiZ; |
| } |
| normExpSig = softfloat_normSubnormalF32Sig( sig ); |
| exp = normExpSig.exp - 1; |
| sig = normExpSig.sig; |
| } |
| uiZ = packToF64UI( sign, exp + 0x380, (uint_fast64_t) sig<<29 ); |
| uiZ: |
| uZ.ui = uiZ; |
| return uZ.f; |
| |
| } |
| |