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authorAndrew Waterman <andrew@sifive.com>2018-07-11 01:16:28 -0700
committerAndrew Waterman <andrew@sifive.com>2018-07-11 01:16:28 -0700
commit5cd8d2b93fad2011fdf8f49a263d77697af35b32 (patch)
treef6fb9cb6d3bef2aa5c9903511b92e5a6e99e9519 /softfloat/s_shiftRightJam256M.c
parent8e69141749065ff957383d2112768f95a33429b6 (diff)
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Upgrade to SoftFloat 3e
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+
+/*============================================================================
+
+This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
+Package, Release 3e, 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 "primitiveTypes.h"
+
+#ifndef softfloat_shiftRightJam256M
+
+static
+ void
+ softfloat_shortShiftRightJamM(
+ uint_fast8_t size_words,
+ const uint64_t *aPtr,
+ uint_fast8_t dist,
+ uint64_t *zPtr
+ )
+{
+ uint_fast8_t uNegDist;
+ unsigned int index, lastIndex;
+ uint64_t partWordZ, wordA;
+
+ uNegDist = -dist;
+ index = indexWordLo( size_words );
+ lastIndex = indexWordHi( size_words );
+ wordA = aPtr[index];
+ partWordZ = wordA>>dist;
+ if ( partWordZ<<dist != wordA ) partWordZ |= 1;
+ while ( index != lastIndex ) {
+ wordA = aPtr[index + wordIncr];
+ zPtr[index] = wordA<<(uNegDist & 63) | partWordZ;
+ index += wordIncr;
+ partWordZ = wordA>>dist;
+ }
+ zPtr[index] = partWordZ;
+
+}
+
+void
+ softfloat_shiftRightJam256M(
+ const uint64_t *aPtr, uint_fast32_t dist, uint64_t *zPtr )
+{
+ uint64_t wordJam;
+ uint_fast32_t wordDist;
+ uint64_t *ptr;
+ uint_fast8_t i, innerDist;
+
+ wordJam = 0;
+ wordDist = dist>>6;
+ if ( wordDist ) {
+ if ( 4 < wordDist ) wordDist = 4;
+ ptr = (uint64_t *) (aPtr + indexMultiwordLo( 4, wordDist ));
+ i = wordDist;
+ do {
+ wordJam = *ptr++;
+ if ( wordJam ) break;
+ --i;
+ } while ( i );
+ ptr = zPtr;
+ }
+ if ( wordDist < 4 ) {
+ aPtr += indexMultiwordHiBut( 4, wordDist );
+ innerDist = dist & 63;
+ if ( innerDist ) {
+ softfloat_shortShiftRightJamM(
+ 4 - wordDist,
+ aPtr,
+ innerDist,
+ zPtr + indexMultiwordLoBut( 4, wordDist )
+ );
+ if ( ! wordDist ) goto wordJam;
+ } else {
+ aPtr += indexWordLo( 4 - wordDist );
+ ptr = zPtr + indexWordLo( 4 );
+ for ( i = 4 - wordDist; i; --i ) {
+ *ptr = *aPtr;
+ aPtr += wordIncr;
+ ptr += wordIncr;
+ }
+ }
+ ptr = zPtr + indexMultiwordHi( 4, wordDist );
+ }
+ do {
+ *ptr++ = 0;
+ --wordDist;
+ } while ( wordDist );
+ wordJam:
+ if ( wordJam ) zPtr[indexWordLo( 4 )] |= 1;
+
+}
+
+#endif
+