Upgrade to SoftFloat 3e

1 files changed, 180 insertions, 0 deletions

diff --git a/softfloat/extF80M_sqrt.c b/softfloat/extF80M_sqrt.c
new file mode 100644
index 0000000..21c15da
--- /dev/null
+++ b/softfloat/extF80M_sqrt.c
@@ -0,0 +1,180 @@
+
+/*============================================================================
+
+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, 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 extF80M_sqrt( const extFloat80_t *aPtr, extFloat80_t *zPtr )
+{
+
+    *zPtr = extF80_sqrt( *aPtr );
+
+}
+
+#else
+
+void extF80M_sqrt( const extFloat80_t *aPtr, extFloat80_t *zPtr )
+{
+    const struct extFloat80M *aSPtr;
+    struct extFloat80M *zSPtr;
+    uint_fast16_t uiA64, signUI64;
+    int32_t expA;
+    uint64_t rem64;
+    int32_t expZ;
+    uint32_t rem96[3], sig32A, recipSqrt32, sig32Z, q;
+    uint64_t sig64Z, x64;
+    uint32_t rem32, term[4], rem[4], extSigZ[3];
+
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    aSPtr = (const struct extFloat80M *) aPtr;
+    zSPtr = (struct extFloat80M *) zPtr;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    uiA64 = aSPtr->signExp;
+    signUI64 = uiA64 & packToExtF80UI64( 1, 0 );
+    expA = expExtF80UI64( uiA64 );
+    rem64 = aSPtr->signif;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( expA == 0x7FFF ) {
+        if ( rem64 & UINT64_C( 0x7FFFFFFFFFFFFFFF ) ) {
+            softfloat_propagateNaNExtF80M( aSPtr, 0, zSPtr );
+            return;
+        }
+        if ( signUI64 ) goto invalid;
+        rem64 = UINT64_C( 0x8000000000000000 );
+        goto copyA;
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( ! expA ) expA = 1;
+    if ( ! (rem64 & UINT64_C( 0x8000000000000000 )) ) {
+        if ( ! rem64 ) {
+            uiA64 = signUI64;
+            goto copyA;
+        }
+        expA += softfloat_normExtF80SigM( &rem64 );
+    }
+    if ( signUI64 ) goto invalid;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    expZ = ((expA - 0x3FFF)>>1) + 0x3FFF;
+    expA &= 1;
+    softfloat_shortShiftLeft64To96M( rem64, 30 - expA, rem96 );
+    sig32A = rem64>>32;
+    recipSqrt32 = softfloat_approxRecipSqrt32_1( expA, sig32A );
+    sig32Z = ((uint64_t) sig32A * recipSqrt32)>>32;
+    if ( expA ) sig32Z >>= 1;
+    rem64 =
+        ((uint64_t) rem96[indexWord( 3, 2 )]<<32 | rem96[indexWord( 3, 1 )])
+            - (uint64_t) sig32Z * sig32Z;
+    rem96[indexWord( 3, 2 )] = rem64>>32;
+    rem96[indexWord( 3, 1 )] = rem64;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    q = ((uint32_t) (rem64>>2) * (uint64_t) recipSqrt32)>>32;
+    sig64Z = ((uint64_t) sig32Z<<32) + ((uint64_t) q<<3);
+    term[indexWord( 3, 2 )] = 0;
+    /*------------------------------------------------------------------------
+    | (Repeating this loop is a rare occurrence.)
+    *------------------------------------------------------------------------*/
+    for (;;) {
+        x64 = ((uint64_t) sig32Z<<32) + sig64Z;
+        term[indexWord( 3, 1 )] = x64>>32;
+        term[indexWord( 3, 0 )] = x64;
+        softfloat_remStep96MBy32(
+            rem96, 29, term, q, &rem[indexMultiwordHi( 4, 3 )] );
+        rem32 = rem[indexWord( 4, 3 )];
+        if ( ! (rem32 & 0x80000000) ) break;
+        --q;
+        sig64Z -= 1<<3;
+    }
+    rem64 = (uint64_t) rem32<<32 | rem[indexWord( 4, 2 )];
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    q = (((uint32_t) (rem64>>2) * (uint64_t) recipSqrt32)>>32) + 2;
+    if ( rem64>>34 ) q += recipSqrt32;
+    x64 = (uint64_t) q<<7;
+    extSigZ[indexWord( 3, 0 )] = x64;
+    x64 = (sig64Z<<1) + (x64>>32);
+    extSigZ[indexWord( 3, 2 )] = x64>>32;
+    extSigZ[indexWord( 3, 1 )] = x64;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( (q & 0xFFFFFF) <= 2 ) {
+        q &= ~(uint32_t) 0xFFFF;
+        extSigZ[indexWordLo( 3 )] = q<<7;
+        x64 = sig64Z + (q>>27);
+        term[indexWord( 4, 3 )] = 0;
+        term[indexWord( 4, 2 )] = x64>>32;
+        term[indexWord( 4, 1 )] = x64;
+        term[indexWord( 4, 0 )] = q<<5;
+        rem[indexWord( 4, 0 )] = 0;
+        softfloat_remStep128MBy32( rem, 28, term, q, rem );
+        q = rem[indexWordHi( 4 )];
+        if ( q & 0x80000000 ) {
+            softfloat_sub1X96M( extSigZ );
+        } else {
+            if ( q || rem[indexWord( 4, 1 )] || rem[indexWord( 4, 2 )] ) {
+                extSigZ[indexWordLo( 3 )] |= 1;
+            }
+        }
+    }
+    softfloat_roundPackMToExtF80M(
+        0, expZ, extSigZ, extF80_roundingPrecision, zSPtr );
+    return;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+ invalid:
+    softfloat_invalidExtF80M( zSPtr );
+    return;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+ copyA:
+    zSPtr->signExp = uiA64;
+    zSPtr->signif  = rem64;
+
+}
+
+#endif
+