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Diffstat (limited to 'source/s_normSubnormalF128Sig.c')
-rw-r--r-- | source/s_normSubnormalF128Sig.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/source/s_normSubnormalF128Sig.c b/source/s_normSubnormalF128Sig.c new file mode 100644 index 0000000..d56d4bc --- /dev/null +++ b/source/s_normSubnormalF128Sig.c @@ -0,0 +1,62 @@ + +/*============================================================================ + +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 <stdint.h> +#include "platform.h" +#include "internals.h" + +struct exp32_sig128 + softfloat_normSubnormalF128Sig( uint_fast64_t sig64, uint_fast64_t sig0 ) +{ + int_fast8_t shiftCount; + struct exp32_sig128 z; + + if ( ! sig64 ) { + shiftCount = softfloat_countLeadingZeros64( sig0 ) - 15; + z.exp = -63 - shiftCount; + if ( shiftCount < 0 ) { + z.sig.v64 = sig0>>-shiftCount; + z.sig.v0 = sig0<<(shiftCount & 63); + } else { + z.sig.v64 = sig0<<shiftCount; + z.sig.v0 = 0; + } + } else { + shiftCount = softfloat_countLeadingZeros64( sig64 ) - 15; + z.exp = 1 - shiftCount; + z.sig = softfloat_shortShiftLeft128( sig64, sig0, shiftCount ); + } + return z; + +} + |