Allow illegal shifts by zero to be recorded as logical shift lefts by zero.

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 03c7e97..2e767f0 100644 (file)
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,8 @@
+2000-08-17  Nick Clifton  <nickc@redhat.com>
+
+       * config/tc-arm.c (decode_shift): Allow illegal shifts by zero
+       to be recoded as logical shift lefts by zero.
+
 2000-08-16  Jim Wilson  <wilson@cygnus.com>
 
        * config/tc-ia64.c (specify_resource, case IA64_RS_GR): Handle

diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
index a2ae26f..8af25e6 100644 (file)
--- a/gas/config/tc-arm.c
+++ b/gas/config/tc-arm.c
@@ -2531,7 +2531,7 @@ decode_shift (str, unrestrict)
      char ** str;
      int     unrestrict;
 {
-  struct asm_shift_name * shift;
+  const struct asm_shift_name * shift;
   char * p;
   char   c;
 
@@ -2548,7 +2548,7 @@ decode_shift (str, unrestrict)
 
   c = * p;
   * p = '\0';
-  shift = (struct asm_shift_name *) hash_find (arm_shift_hsh, * str);
+  shift = (const struct asm_shift_name *) hash_find (arm_shift_hsh, * str);
   * p = c;
   
   if (shift == NULL)
@@ -2602,10 +2602,16 @@ decode_shift (str, unrestrict)
          || (num == 32 && shift->properties->allows_32 == 0)
          )
        {
-         /* As a special case we allow ROR #0, but we issue a message
-            reminding the programmer that this is actually an RRX.  */
-         if (num == 0 && shift->properties->index == SHIFT_ROR)
-           as_tsktsk (_("ROR #0 is actually RRX"));
+         /* As a special case we allow a shift of zero for
+            modes that do not support it to be recoded as an
+            logical shift left of zero (ie nothing).  We warn
+            about this though.  */
+         if (num == 0)
+           {
+             as_tsktsk (_("Shift of 0 ignored."));
+             shift = shift_names;
+             assert (shift->properties->index == SHIFT_LSL);
+           }
          else
            {
              inst.error = _("Invalid immediate shift");