Release 3b. See "doc/SoftFloat-history.html".

1 files changed, 31 insertions, 14 deletions

diff --git a/source/s_addMagsF64.c b/source/s_addMagsF64.c
index ba67e7c..72c1dd0 100644
--- a/source/s_addMagsF64.c
+++ b/source/s_addMagsF64.c
@@ -2,10 +2,10 @@
 /*============================================================================
 
 This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
-Package, Release 3a, by John R. Hauser.
+Package, Release 3b, by John R. Hauser.
 
-Copyright 2011, 2012, 2013, 2014 The Regents of the University of California.
-All rights reserved.
+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:
@@ -53,28 +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;
@@ -82,7 +89,11 @@ float64_t
                 goto uiZ;
             }
             expZ = expB;
-            sigA += expA ? UINT64_C( 0x2000000000000000 ) : sigA;
+            if ( expA ) {
+                sigA += UINT64_C( 0x2000000000000000 );
+            } else {
+                sigA <<= 1;
+            }
             sigA = softfloat_shiftRightJam64( sigA, -expDiff );
         } else {
             if ( expA == 0x7FF ) {
@@ -91,7 +102,11 @@ float64_t
                 goto uiZ;
             }
             expZ = expA;
-            sigB += expB ? UINT64_C( 0x2000000000000000 ) : sigB;
+            if ( expB ) {
+                sigB += UINT64_C( 0x2000000000000000 );
+            } else {
+                sigB <<= 1;
+            }
             sigB = softfloat_shiftRightJam64( sigB, expDiff );
         }
         sigZ = UINT64_C( 0x2000000000000000 ) + sigA + sigB;
@@ -101,6 +116,8 @@ float64_t
         }
     }
     return softfloat_roundPackToF64( signZ, expZ, sigZ );
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
  propagateNaN:
     uiZ = softfloat_propagateNaNF64UI( uiA, uiB );
  uiZ: