c-common.h (DECL_C_HARD_REGISTER): New.

        * c-common.h (DECL_C_HARD_REGISTER): New.
        * c-decl.c (finish_decl): Set it for asm register variables.
        * c-semantics.c (emit_local_var): Test it when instantiating one.

From-SVN: r37748

gcc/ChangeLog

 2000-11-25  Richard Henderson  <rth@redhat.com>
 
+	* c-common.h (DECL_C_HARD_REGISTER): New.
+	* c-decl.c (finish_decl): Set it for asm register variables.
+	* c-semantics.c (emit_local_var): Test it when instantiating one.
+
+2000-11-25  Richard Henderson  <rth@redhat.com>
+
 	* c-decl.c (c_expand_body): Use DECL_SOURCE_LINE rather than
 	lineno for the start of the function.
 

gcc/c-common.h

@@ -686,6 +686,10 @@ extern int anon_aggr_type_p                     PARAMS ((tree));
 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 
+/* In a VAR_DECL, nonzero if the decl is a register variable with
+   an explicit asm specification.  */
+#define DECL_C_HARD_REGISTER(DECL)  DECL_LANG_FLAG_4 (VAR_DECL_CHECK (DECL))
+
 extern void emit_local_var                      PARAMS ((tree));
 extern void make_rtl_for_local_static           PARAMS ((tree));
 extern tree expand_cond                         PARAMS ((tree));

gcc/c-decl.c

@@ -3765,7 +3765,10 @@ finish_decl (decl, init, asmspec_tree)
       else
 	{
 	  if (asmspec)
-	    DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
+	    {
+	      DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
+	      DECL_C_HARD_REGISTER (decl) = 1;
+	    }
 	  add_decl_stmt (decl);
 	}
 

gcc/c-semantics.c

@@ -313,9 +313,9 @@ emit_local_var (decl)
   /* Create RTL for this variable.  */
   if (!DECL_RTL (decl))
     {
-      if (DECL_ASSEMBLER_NAME (decl) != DECL_NAME (decl))
-	/* The user must have specified an assembler name for this
-	   variable.  Set that up now.  */
+      if (DECL_C_HARD_REGISTER (decl))
+	/* The user specified an assembler name for this variable.
+	   Set that up now.  */
 	rest_of_decl_compilation
 	  (decl, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
 	   /*top_level=*/0, /*at_end=*/0);