re PR target/16407 (Unaligned access to local variables)

	PR target/16407
	* config/mips/mips-protos.h (mips_declare_common_object): Declare.
	* config/mips/mips.c (mips_declare_common_object): New function,
	mostly split out from...
	(mips_output_aligned_decl_common): ...here.
	* config/mips/mips.h (ASM_OUTPUT_LOCAL): Remove in favor of...
	(ASM_OUTPUT_ALIGNED_LOCAL): ...this new definition.
	* config/mips/iris6.h (ASM_OUTPUT_ALIGNED_LOCAL): Undefine this
	rather than ASM_OUTPUT_LOCAL.  Call mips_declare_common_object.

From-SVN: r84219

gcc/ChangeLog

+2004-07-07  Richard Sandiford  <rsandifo@redhat.com>
+
+	PR target/16407
+	* config/mips/mips-protos.h (mips_declare_common_object): Declare.
+	* config/mips/mips.c (mips_declare_common_object): New function,
+	mostly split out from...
+	(mips_output_aligned_decl_common): ...here.
+	* config/mips/mips.h (ASM_OUTPUT_LOCAL): Remove in favor of...
+	(ASM_OUTPUT_ALIGNED_LOCAL): ...this new definition.
+	* config/mips/iris6.h (ASM_OUTPUT_ALIGNED_LOCAL): Undefine this
+	rather than ASM_OUTPUT_LOCAL.  Call mips_declare_common_object.
+
 2004-07-07  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
 
 	PR c/16392

gcc/config/mips/iris6.h

@@ -357,7 +357,7 @@ do								\
 while (0)
 
 /* ??? SGI assembler gives warning whenever .lcomm is used.  */
-#undef ASM_OUTPUT_LOCAL
+#undef ASM_OUTPUT_ALIGNED_LOCAL
 #define ASM_OUTPUT_ALIGNED_LOCAL(STREAM, NAME, SIZE, ALIGN)		   \
 do									   \
   {									   \
@@ -369,7 +369,8 @@ do									   \
 	ASM_OUTPUT_SKIP (STREAM, SIZE);					   \
       }									   \
     else								   \
-      mips_declare_object (STREAM, NAME, "\n\t.lcomm\t", ",%u\n", (int)(SIZE)); \
+      mips_declare_common_object (STREAM, NAME, "\n\t.lcomm\t",		   \
+				  SIZE, ALIGN, false);			   \
   }									   \
 while (0)
 

gcc/config/mips/mips-protos.h

@@ -166,6 +166,9 @@ extern void mips_output_aligned_bss (FILE *, tree, const char *,
 extern void mips_output_aligned_decl_common (FILE *, tree, const char *,
 					     unsigned HOST_WIDE_INT,
 					     unsigned int);
+extern void mips_declare_common_object (FILE *, const char *,
+					const char *, unsigned HOST_WIDE_INT,
+					unsigned int, bool);
 extern void mips_declare_object (FILE *, const char *, const char *,
 				 const char *, ...);
 extern void mips_declare_object_name (FILE *, const char *, tree);

gcc/config/mips/mips.c

@@ -5987,17 +5987,32 @@ mips_output_aligned_decl_common (FILE *stream, tree decl, const char *name,
 			   ":\n\t.space\t" HOST_WIDE_INT_PRINT_UNSIGNED "\n",
 			   size);
     }
-  else if (TARGET_SGI_O32_AS)
+  else
+    /* The SGI o32 assembler doesn't accept an alignment.  */
+    mips_declare_common_object (stream, name, "\n\t.comm\t",
+				size, align, !TARGET_SGI_O32_AS);
+}
+
+/* Declare a common object of SIZE bytes using asm directive INIT_STRING.
+   NAME is the name of the object and ALIGN is the required alignment
+   in bytes.  TAKES_ALIGNMENT_P is true if the directive takes a third
+   alignment argument.  */
+
+void
+mips_declare_common_object (FILE *stream, const char *name,
+			    const char *init_string,
+			    unsigned HOST_WIDE_INT size,
+			    unsigned int align, bool takes_alignment_p)
+{
+  if (!takes_alignment_p)
     {
-      /* The SGI o32 assembler doesn't accept an alignment, so round up
-	 the size instead.  */
       size += (align / BITS_PER_UNIT) - 1;
       size -= size % (align / BITS_PER_UNIT);
-      mips_declare_object (stream, name, "\n\t.comm\t",
+      mips_declare_object (stream, name, init_string,
 			   "," HOST_WIDE_INT_PRINT_UNSIGNED "\n", size);
     }
   else
-    mips_declare_object (stream, name, "\n\t.comm\t",
+    mips_declare_object (stream, name, init_string,
 			 "," HOST_WIDE_INT_PRINT_UNSIGNED ",%u\n",
 			 size, align / BITS_PER_UNIT);
 }

gcc/config/mips/mips.h

@@ -3189,9 +3189,10 @@ while (0)
 /* This says how to define a local common symbol (ie, not visible to
    linker).  */
 
-#define ASM_OUTPUT_LOCAL(STREAM, NAME, SIZE, ROUNDED)			\
-  mips_declare_object (STREAM, NAME, "\n\t.lcomm\t", ",%u\n", (int)(SIZE))
-
+#ifndef ASM_OUTPUT_ALIGNED_LOCAL
+#define ASM_OUTPUT_ALIGNED_LOCAL(STREAM, NAME, SIZE, ALIGN) \
+  mips_declare_common_object (STREAM, NAME, "\n\t.lcomm\t", SIZE, ALIGN, false)
+#endif
 
 /* This says how to output an external.  It would be possible not to
    output anything and let undefined symbol become external. However

gcc/testsuite/ChangeLog

+2004-07-07  Richard Sandiford  <rsandifo@redhat.com>
+
+	* gcc.c-torture/execute/20040707-1.c: New test.
+
 2004-07-06  Richard Sandiford  <rsandifo@redhat.com>
 
 	* gcc.c-torture/execute/20040706-1.c: New test.

gcc/testsuite/gcc.c-torture/execute/20040707-1.c

+struct s { char c1, c2; };
+void foo (struct s s)
+{
+  static struct s s1;
+  s1 = s;
+}
+int main ()
+{
+  static struct s s2;
+  foo (s2);
+  exit (0);
+}