First draft of RC for Release 3, to start review process.

1 files changed, 184 insertions, 0 deletions

diff --git a/source/f128M_div.c b/source/f128M_div.c
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+++ b/source/f128M_div.c
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+
+/*============================================================================
+
+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 <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+#ifdef SOFTFLOAT_FAST_INT64
+
+void
+ f128M_div( const float128_t *aPtr, const float128_t *bPtr, float128_t *zPtr )
+{
+
+    *zPtr = f128_div( *aPtr, *bPtr );
+
+}
+
+#else
+
+void
+ f128M_div( const float128_t *aPtr, const float128_t *bPtr, float128_t *zPtr )
+{
+    const uint32_t *aWPtr, *bWPtr;
+    uint32_t *zWPtr, uiA96;
+    bool signA;
+    int32_t expA;
+    uint32_t uiB96;
+    bool signB;
+    int32_t expB;
+    bool signZ;
+    uint32_t y[5], sigB[4];
+    int32_t expZ;
+    uint32_t recip32;
+    int ix;
+    uint64_t q64;
+    uint32_t q, qs[3], uiZ96;
+
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    aWPtr = (const uint32_t *) aPtr;
+    bWPtr = (const uint32_t *) bPtr;
+    zWPtr = (uint32_t *) zPtr;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    uiA96 = aWPtr[indexWordHi( 4 )];
+    signA = signF128UI96( uiA96 );
+    expA  = expF128UI96( uiA96 );
+    uiB96 = bWPtr[indexWordHi( 4 )];
+    signB = signF128UI96( uiB96 );
+    expB  = expF128UI96( uiB96 );
+    signZ = signA ^ signB;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( (expA == 0x7FFF) || (expB == 0x7FFF) ) {
+        if ( softfloat_tryPropagateNaNF128M( aWPtr, bWPtr, zWPtr ) ) return;
+        if ( expA == 0x7FFF ) {
+            if ( expB == 0x7FFF ) goto invalid;
+            goto infinity;
+        }
+        goto zero;
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    expA = softfloat_shiftNormSigF128M( aWPtr, 13, y );
+    expB = softfloat_shiftNormSigF128M( bWPtr, 13, sigB );
+    if ( expA == -128 ) {
+        if ( expB == -128 ) goto invalid;
+        goto zero;
+    }
+    if ( expB == -128 ) {
+        softfloat_raiseFlags( softfloat_flag_infinite );
+        goto infinity;
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    expZ = expA - expB + 0x3FFE;
+    if ( softfloat_compare128M( y, sigB ) < 0 ) {
+        --expZ;
+        softfloat_add128M( y, y, y );
+    }
+    recip32 =
+        softfloat_approxRecip32_1(
+            ((uint64_t) sigB[indexWord( 4, 3 )]<<32 | sigB[indexWord( 4, 2 )])
+                >>30
+        );
+    ix = 3;
+    for (;;) {
+        q64 = (uint64_t) y[indexWordHi( 4 )] * recip32;
+        q = (q64 + 0x80000000)>>32;
+        --ix;
+        if ( ix < 0 ) break;
+        softfloat_remStep128MBy32( y, 29, sigB, q, y );
+        if ( y[indexWordHi( 4 )] & 0x80000000 ) {
+            --q;
+            softfloat_add128M( y, sigB, y );
+        }
+        qs[ix] = q;
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( ((q + 1) & 7) < 2 ) {
+        softfloat_remStep128MBy32( y, 29, sigB, q, y );
+        if ( y[indexWordHi( 4 )] & 0x80000000 ) {
+            --q;
+            softfloat_add128M( y, sigB, y );
+        } else if ( softfloat_compare128M( sigB, y ) <= 0 ) {
+            ++q;
+            softfloat_sub128M( y, sigB, y );
+        }
+        if (
+            y[indexWordLo( 4 )] || y[indexWord( 4, 1 )]
+                || (y[indexWord( 4, 2 )] | y[indexWord( 4, 3 )])
+        ) {
+            q |= 1;
+        }
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    q64 = (uint64_t) q<<28;
+    y[indexWord( 5, 0 )] = q64;
+    q64 = ((uint64_t) qs[0]<<25) + (q64>>32);
+    y[indexWord( 5, 1 )] = q64;
+    q64 = ((uint64_t) qs[1]<<22) + (q64>>32);
+    y[indexWord( 5, 2 )] = q64;
+    q64 = ((uint64_t) qs[2]<<19) + (q64>>32);
+    y[indexWord( 5, 3 )] = q64;
+    y[indexWord( 5, 4 )] = q64>>32;
+    softfloat_roundPackMToF128M( signZ, expZ, y, zWPtr );
+    return;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+ invalid:
+    softfloat_invalidF128M( zWPtr );
+    return;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+ infinity:
+    uiZ96 = packToF128UI96( signZ, 0x7FFF, 0 );
+    goto uiZ96;
+ zero:
+    uiZ96 = packToF128UI96( signZ, 0, 0 );
+ uiZ96:
+    zWPtr[indexWordHi( 4 )] = uiZ96;
+    zWPtr[indexWord( 4, 2 )] = 0;
+    zWPtr[indexWord( 4, 1 )] = 0;
+    zWPtr[indexWord( 4, 0 )] = 0;
+
+}
+
+#endif
+