Support debug system bus access.

[riscv-isa-sim.git] / softfloat / s_addMagsF64.c

diff --git a/softfloat/s_addMagsF64.c b/softfloat/s_addMagsF64.c
old mode 100755 (executable)
new mode 100644 (file)
index a81c3e4..63e1afe
--- a/softfloat/s_addMagsF64.c
+++ b/softfloat/s_addMagsF64.c
@@ -1,8 +1,42 @@
 
+/*============================================================================
+
+This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
+Package, Release 3d, by John R. Hauser.
+
+Copyright 2011, 2012, 2013, 2014, 2015, 2016 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 "primitives.h"
 #include "internals.h"
 #include "specialize.h"
 
@@ -19,28 +53,35 @@ float64_t
     uint_fast64_t sigZ;
     union ui64_f64 uZ;
 
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
     expA = expF64UI( uiA );
     sigA = fracF64UI( uiA );
     expB = expF64UI( uiB );
     sigB = fracF64UI( uiB );
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
     expDiff = expA - expB;
-    sigA <<= 9;
-    sigB <<= 9;
     if ( ! expDiff ) {
+        /*--------------------------------------------------------------------
+        *--------------------------------------------------------------------*/
+        if ( ! expA ) {
+            uiZ = uiA + sigB;
+            goto uiZ;
+        }
         if ( expA == 0x7FF ) {
             if ( sigA | sigB ) goto propagateNaN;
             uiZ = uiA;
             goto uiZ;
         }
-        if ( ! expA ) {
-            uiZ =
-                packToF64UI(
-                    signZ, 0, ( uiA + uiB ) & UINT64_C( 0x7FFFFFFFFFFFFFFF ) );
-            goto uiZ;
-        }
         expZ = expA;
-        sigZ = UINT64_C( 0x4000000000000000 ) + sigA + sigB;
+        sigZ = UINT64_C( 0x0020000000000000 ) + sigA + sigB;
+        sigZ <<= 9;
     } else {
+        /*--------------------------------------------------------------------
+        *--------------------------------------------------------------------*/
+        sigA <<= 9;
+        sigB <<= 9;
         if ( expDiff < 0 ) {
             if ( expB == 0x7FF ) {
                 if ( sigB ) goto propagateNaN;
@@ -48,8 +89,12 @@ float64_t
                 goto uiZ;
             }
             expZ = expB;
-            sigA += expA ? UINT64_C( 0x2000000000000000 ) : sigA;
-            sigA = softfloat_shift64RightJam( sigA, - expDiff );
+            if ( expA ) {
+                sigA += UINT64_C( 0x2000000000000000 );
+            } else {
+                sigA <<= 1;
+            }
+            sigA = softfloat_shiftRightJam64( sigA, -expDiff );
         } else {
             if ( expA == 0x7FF ) {
                 if ( sigA ) goto propagateNaN;
@@ -57,8 +102,12 @@ float64_t
                 goto uiZ;
             }
             expZ = expA;
-            sigB += expB ? UINT64_C( 0x2000000000000000 ) : sigB;
-            sigB = softfloat_shift64RightJam( sigB, expDiff );
+            if ( expB ) {
+                sigB += UINT64_C( 0x2000000000000000 );
+            } else {
+                sigB <<= 1;
+            }
+            sigB = softfloat_shiftRightJam64( sigB, expDiff );
         }
         sigZ = UINT64_C( 0x2000000000000000 ) + sigA + sigB;
         if ( sigZ < UINT64_C( 0x4000000000000000 ) ) {
@@ -67,6 +116,8 @@ float64_t
         }
     }
     return softfloat_roundPackToF64( signZ, expZ, sigZ );
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
  propagateNaN:
     uiZ = softfloat_propagateNaNF64UI( uiA, uiB );
  uiZ: