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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
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treef6fb9cb6d3bef2aa5c9903511b92e5a6e99e9519 /softfloat/f128M_roundToInt.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, 2017 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 <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+#ifdef SOFTFLOAT_FAST_INT64
+
+void
+ f128M_roundToInt(
+ const float128_t *aPtr,
+ uint_fast8_t roundingMode,
+ bool exact,
+ float128_t *zPtr
+ )
+{
+
+ *zPtr = f128_roundToInt( *aPtr, roundingMode, exact );
+
+}
+
+#else
+
+void
+ f128M_roundToInt(
+ const float128_t *aPtr,
+ uint_fast8_t roundingMode,
+ bool exact,
+ float128_t *zPtr
+ )
+{
+ const uint32_t *aWPtr;
+ uint32_t *zWPtr;
+ uint32_t ui96;
+ int32_t exp;
+ uint32_t sigExtra;
+ bool sign;
+ uint_fast8_t bitPos;
+ bool roundNear;
+ unsigned int index, lastIndex;
+ bool extra;
+ uint32_t wordA, bit, wordZ;
+ uint_fast8_t carry;
+ uint32_t extrasMask;
+
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ aWPtr = (const uint32_t *) aPtr;
+ zWPtr = (uint32_t *) zPtr;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ ui96 = aWPtr[indexWordHi( 4 )];
+ exp = expF128UI96( ui96 );
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ if ( exp < 0x3FFF ) {
+ zWPtr[indexWord( 4, 2 )] = 0;
+ zWPtr[indexWord( 4, 1 )] = 0;
+ zWPtr[indexWord( 4, 0 )] = 0;
+ sigExtra = aWPtr[indexWord( 4, 2 )];
+ if ( !sigExtra ) {
+ sigExtra = aWPtr[indexWord( 4, 1 )] | aWPtr[indexWord( 4, 0 )];
+ }
+ if ( !sigExtra && !(ui96 & 0x7FFFFFFF) ) goto ui96;
+ if ( exact ) softfloat_raiseFlags( softfloat_flag_inexact );
+ sign = signF128UI96( ui96 );
+ switch ( roundingMode ) {
+ case softfloat_round_near_even:
+ if ( !fracF128UI96( ui96 ) && !sigExtra ) break;
+ case softfloat_round_near_maxMag:
+ if ( exp == 0x3FFE ) goto mag1;
+ break;
+ case softfloat_round_min:
+ if ( sign ) goto mag1;
+ break;
+ case softfloat_round_max:
+ if ( !sign ) goto mag1;
+ break;
+#ifdef SOFTFLOAT_ROUND_ODD
+ case softfloat_round_odd:
+ goto mag1;
+#endif
+ }
+ ui96 = packToF128UI96( sign, 0, 0 );
+ goto ui96;
+ mag1:
+ ui96 = packToF128UI96( sign, 0x3FFF, 0 );
+ goto ui96;
+ }
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ if ( 0x406F <= exp ) {
+ if (
+ (exp == 0x7FFF)
+ && (fracF128UI96( ui96 )
+ || (aWPtr[indexWord( 4, 2 )] | aWPtr[indexWord( 4, 1 )]
+ | aWPtr[indexWord( 4, 0 )]))
+ ) {
+ softfloat_propagateNaNF128M( aWPtr, 0, zWPtr );
+ return;
+ }
+ zWPtr[indexWord( 4, 2 )] = aWPtr[indexWord( 4, 2 )];
+ zWPtr[indexWord( 4, 1 )] = aWPtr[indexWord( 4, 1 )];
+ zWPtr[indexWord( 4, 0 )] = aWPtr[indexWord( 4, 0 )];
+ goto ui96;
+ }
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ bitPos = 0x406F - exp;
+ roundNear =
+ (roundingMode == softfloat_round_near_maxMag)
+ || (roundingMode == softfloat_round_near_even);
+ bitPos -= roundNear;
+ index = indexWordLo( 4 );
+ lastIndex = indexWordHi( 4 );
+ extra = 0;
+ for (;;) {
+ wordA = aWPtr[index];
+ if ( bitPos < 32 ) break;
+ if ( wordA ) extra = 1;
+ zWPtr[index] = 0;
+ index += wordIncr;
+ bitPos -= 32;
+ }
+ bit = (uint32_t) 1<<bitPos;
+ if ( roundNear ) {
+ wordZ = wordA + bit;
+ carry = (wordZ < wordA);
+ bit <<= 1;
+ extrasMask = bit - 1;
+ if ( exact && (extra || (wordA & extrasMask)) ) {
+ softfloat_raiseFlags( softfloat_flag_inexact );
+ }
+ if (
+ (roundingMode == softfloat_round_near_even)
+ && !extra && !(wordZ & extrasMask)
+ ) {
+ if ( !bit ) {
+ zWPtr[index] = wordZ;
+ index += wordIncr;
+ wordZ = aWPtr[index] + carry;
+ carry &= !wordZ;
+ zWPtr[index] = wordZ & ~1;
+ goto propagateCarry;
+ }
+ wordZ &= ~bit;
+ }
+ } else {
+ wordZ = wordA;
+ carry = 0;
+ extrasMask = bit - 1;
+ if ( extra || (wordA & extrasMask) ) {
+ if ( exact ) softfloat_raiseFlags( softfloat_flag_inexact );
+ if (
+ roundingMode
+ == (signF128UI96( ui96 ) ? softfloat_round_min
+ : softfloat_round_max)
+ ) {
+ wordZ += bit;
+ carry = (wordZ < wordA);
+#ifdef SOFTFLOAT_ROUND_ODD
+ } else if ( roundingMode == softfloat_round_odd ) {
+ wordZ |= bit;
+#endif
+ }
+ }
+ }
+ wordZ &= ~extrasMask;
+ zWPtr[index] = wordZ;
+ propagateCarry:
+ while ( index != lastIndex ) {
+ index += wordIncr;
+ wordZ = aWPtr[index] + carry;
+ zWPtr[index] = wordZ;
+ carry &= !wordZ;
+ }
+ return;
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ ui96:
+ zWPtr[indexWordHi( 4 )] = ui96;
+
+}
+
+#endif
+