| |
| /*============================================================================ |
| |
| 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" |
| |
| void |
| softfloat_normRoundPackMToF128M( |
| bool sign, int32_t exp, uint32_t *extSigPtr, uint32_t *zWPtr ) |
| { |
| const uint32_t *ptr; |
| int_fast16_t shiftCount; |
| uint32_t wordSig; |
| |
| ptr = extSigPtr + indexWordHi( 5 ); |
| shiftCount = 0; |
| for (;;) { |
| wordSig = *ptr; |
| if ( wordSig ) break; |
| shiftCount += 32; |
| if ( 160 <= shiftCount ) { |
| zWPtr[indexWordHi( 4 )] = packToF128UI96( sign, 0, 0 ); |
| zWPtr[indexWord( 4, 2 )] = 0; |
| zWPtr[indexWord( 4, 1 )] = 0; |
| zWPtr[indexWord( 4, 0 )] = 0; |
| return; |
| } |
| ptr -= wordIncr; |
| } |
| shiftCount += softfloat_countLeadingZeros32( wordSig ) - 15; |
| if ( shiftCount ) { |
| exp -= shiftCount; |
| softfloat_shiftLeft160M( extSigPtr, shiftCount, extSigPtr ); |
| } |
| softfloat_roundPackMToF128M( sign, exp, extSigPtr, zWPtr ); |
| |
| } |
| |