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

1 files changed, 169 insertions, 0 deletions

diff --git a/source/f64_div.c b/source/f64_div.c
new file mode 100644
index 0000000..a0a3f07
--- /dev/null
+++ b/source/f64_div.c
@@ -0,0 +1,169 @@
+
+/*============================================================================
+
+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"
+
+float64_t f64_div( float64_t a, float64_t b )
+{
+    union ui64_f64 uA;
+    uint_fast64_t uiA;
+    bool signA;
+    int_fast16_t expA;
+    uint_fast64_t sigA;
+    union ui64_f64 uB;
+    uint_fast64_t uiB;
+    bool signB;
+    int_fast16_t expB;
+    uint_fast64_t sigB;
+    bool signZ;
+    struct exp16_sig64 normExpSig;
+    int_fast16_t expZ;
+    uint32_t recip32, sig32Z, doubleTerm;
+    uint_fast64_t rem;
+    uint32_t q;
+    uint_fast64_t sigZ;
+    uint_fast64_t uiZ;
+    union ui64_f64 uZ;
+
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    uA.f = a;
+    uiA = uA.ui;
+    signA = signF64UI( uiA );
+    expA  = expF64UI( uiA );
+    sigA  = fracF64UI( uiA );
+    uB.f = b;
+    uiB = uB.ui;
+    signB = signF64UI( uiB );
+    expB  = expF64UI( uiB );
+    sigB  = fracF64UI( uiB );
+    signZ = signA ^ signB;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( expA == 0x7FF ) {
+        if ( sigA ) goto propagateNaN;
+        if ( expB == 0x7FF ) {
+            if ( sigB ) goto propagateNaN;
+            goto invalid;
+        }
+        goto infinity;
+    }
+    if ( expB == 0x7FF ) {
+        if ( sigB ) goto propagateNaN;
+        goto zero;
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( ! expB ) {
+        if ( ! sigB ) {
+            if ( ! (expA | sigA) ) goto invalid;
+            softfloat_raiseFlags( softfloat_flag_infinite );
+            goto infinity;
+        }
+        normExpSig = softfloat_normSubnormalF64Sig( sigB );
+        expB = normExpSig.exp;
+        sigB = normExpSig.sig;
+    }
+    if ( ! expA ) {
+        if ( ! sigA ) goto zero;
+        normExpSig = softfloat_normSubnormalF64Sig( sigA );
+        expA = normExpSig.exp;
+        sigA = normExpSig.sig;
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    expZ = expA - expB + 0x3FE;
+    sigA |= UINT64_C( 0x0010000000000000 );
+    sigB |= UINT64_C( 0x0010000000000000 );
+    if ( sigA < sigB ) {
+        --expZ;
+        sigA <<= 11;
+    } else {
+        sigA <<= 10;
+    }
+    sigB <<= 11;
+    recip32 = softfloat_approxRecip32_1( sigB>>32 ) - 2;
+    sig32Z = ((uint32_t) (sigA>>32) * (uint_fast64_t) recip32)>>32;
+    doubleTerm = sig32Z<<1;
+    rem =
+        ((sigA - (uint_fast64_t) doubleTerm * (uint32_t) (sigB>>32))<<28)
+            - (uint_fast64_t) doubleTerm * ((uint32_t) sigB>>4);
+    q = (((uint32_t) (rem>>32) * (uint_fast64_t) recip32)>>32) + 4;
+    sigZ = ((uint_fast64_t) sig32Z<<32) + ((uint_fast64_t) q<<4);
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( (sigZ & 0x1FF) < 4<<4 ) {
+        q &= ~7;
+        sigZ &= ~(uint_fast64_t) 0x7F;
+        doubleTerm = q<<1;
+        rem =
+            ((rem - (uint_fast64_t) doubleTerm * (uint32_t) (sigB>>32))<<28)
+                - (uint_fast64_t) doubleTerm * ((uint32_t) sigB>>4);
+        if ( rem & UINT64_C( 0x8000000000000000 ) ) {
+            sigZ -= 1<<7;
+        } else {
+            if ( rem ) sigZ |= 1;
+        }
+    }
+    return softfloat_roundPackToF64( signZ, expZ, sigZ );
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+ propagateNaN:
+    uiZ = softfloat_propagateNaNF64UI( uiA, uiB );
+    goto uiZ;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+ invalid:
+    softfloat_raiseFlags( softfloat_flag_invalid );
+    uiZ = defaultNaNF64UI;
+    goto uiZ;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+ infinity:
+    uiZ = packToF64UI( signZ, 0x7FF, 0 );
+    goto uiZ;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+ zero:
+    uiZ = packToF64UI( signZ, 0, 0 );
+ uiZ:
+    uZ.ui = uiZ;
+    return uZ.f;
+
+}
+