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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/f128M_to_i64.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, 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
+
+int_fast64_t
+ f128M_to_i64( const float128_t *aPtr, uint_fast8_t roundingMode, bool exact )
+{
+
+ return f128_to_i64( *aPtr, roundingMode, exact );
+
+}
+
+#else
+
+int_fast64_t
+ f128M_to_i64( const float128_t *aPtr, uint_fast8_t roundingMode, bool exact )
+{
+ const uint32_t *aWPtr;
+ uint32_t uiA96;
+ bool sign;
+ int32_t exp;
+ uint32_t sig96;
+ int32_t shiftDist;
+ uint32_t sig[4];
+
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ aWPtr = (const uint32_t *) aPtr;
+ uiA96 = aWPtr[indexWordHi( 4 )];
+ sign = signF128UI96( uiA96 );
+ exp = expF128UI96( uiA96 );
+ sig96 = fracF128UI96( uiA96 );
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ shiftDist = 0x404F - exp;
+ if ( shiftDist < 17 ) {
+ softfloat_raiseFlags( softfloat_flag_invalid );
+ return
+ (exp == 0x7FFF)
+ && (sig96
+ || (aWPtr[indexWord( 4, 2 )] | aWPtr[indexWord( 4, 1 )]
+ | aWPtr[indexWord( 4, 0 )]))
+ ? i64_fromNaN
+ : sign ? i64_fromNegOverflow : i64_fromPosOverflow;
+ }
+ /*------------------------------------------------------------------------
+ *------------------------------------------------------------------------*/
+ if ( exp ) sig96 |= 0x00010000;
+ sig[indexWord( 4, 3 )] = sig96;
+ sig[indexWord( 4, 2 )] = aWPtr[indexWord( 4, 2 )];
+ sig[indexWord( 4, 1 )] = aWPtr[indexWord( 4, 1 )];
+ sig[indexWord( 4, 0 )] = aWPtr[indexWord( 4, 0 )];
+ softfloat_shiftRightJam128M( sig, shiftDist, sig );
+ return
+ softfloat_roundMToI64(
+ sign, sig + indexMultiwordLo( 4, 3 ), roundingMode, exact );
+
+}
+
+#endif
+