diff options
author | John Hauser <jhauser@eecs.berkeley.edu> | 2014-11-28 19:49:28 -0800 |
---|---|---|
committer | John Hauser <jhauser@eecs.berkeley.edu> | 2014-11-28 19:49:28 -0800 |
commit | 8f59d925353145a65c09301dea6c47da1f1311b1 (patch) | |
tree | c55a81490cc411be6c812a5bfcc8fdc48296def9 /source/extF80M_to_i64.c | |
download | berkeley-softfloat-3-8f59d925353145a65c09301dea6c47da1f1311b1.zip berkeley-softfloat-3-8f59d925353145a65c09301dea6c47da1f1311b1.tar.gz berkeley-softfloat-3-8f59d925353145a65c09301dea6c47da1f1311b1.tar.bz2 |
First draft of RC for Release 3, to start review process.
Diffstat (limited to 'source/extF80M_to_i64.c')
-rw-r--r-- | source/extF80M_to_i64.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/source/extF80M_to_i64.c b/source/extF80M_to_i64.c new file mode 100644 index 0000000..68c584d --- /dev/null +++ b/source/extF80M_to_i64.c @@ -0,0 +1,92 @@ + +/*============================================================================ + +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 "softfloat.h" + +#ifdef SOFTFLOAT_FAST_INT64 + +int_fast64_t + extF80M_to_i64( + const extFloat80_t *aPtr, uint_fast8_t roundingMode, bool exact ) +{ + + return extF80_to_i64( *aPtr, roundingMode, exact ); + +} + +#else + +int_fast64_t + extF80M_to_i64( + const extFloat80_t *aPtr, uint_fast8_t roundingMode, bool exact ) +{ + const struct extFloat80M *aSPtr; + uint_fast16_t uiA64; + bool sign; + int32_t exp; + uint64_t sig; + int32_t shiftCount; + uint32_t extSig[3]; + + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + aSPtr = (const struct extFloat80M *) aPtr; + uiA64 = aSPtr->signExp; + sign = signExtF80UI64( uiA64 ); + exp = expExtF80UI64( uiA64 ); + sig = aSPtr->signif; + /*------------------------------------------------------------------------ + *------------------------------------------------------------------------*/ + shiftCount = 0x403E - exp; + if ( shiftCount < 0 ) { + softfloat_raiseFlags( softfloat_flag_invalid ); + return + ! sign + || ((exp == 0x7FFF) && (sig & UINT64_C( 0x7FFFFFFFFFFFFFFF ))) + ? INT64_C( 0x7FFFFFFFFFFFFFFF ) + : -INT64_C( 0x7FFFFFFFFFFFFFFF ) - 1; + } + extSig[indexWord( 3, 2 )] = sig>>32; + extSig[indexWord( 3, 1 )] = sig; + extSig[indexWord( 3, 0 )] = 0; + if ( shiftCount ) softfloat_shiftRightJam96M( extSig, shiftCount, extSig ); + return softfloat_roundPackMToI64( sign, extSig, roundingMode, exact ); + +} + +#endif + |