Emit a label for the split cold function part.

Emit a label for the split cold function part.  Label name is formed by
suffixing the original function name with "cold".

Patch tested for bootstrap on all default languages on x86_64 and
regression testsuite checked for parity with RUNTESTFLAGS -m32 and m64.

From-SVN: r205057

gcc/ChangeLog

+2013-11-19  Sriraman Tallam  <tmsriram@google.com>
+
+	* final.c (final_scan_insn): Emit a label for the split
+	cold function part.  Label name is formed by suffixing
+	the original function name with "cold".
+
 2013-11-19  David Malcolm  <dmalcolm@redhat.com>
 
 	* basic-block.h (ENTRY_BLOCK_PTR_FOR_FUNCTION): Rename macro to...

gcc/final.c

@@ -2168,6 +2168,15 @@ final_scan_insn (rtx insn, FILE *file, int optimize_p ATTRIBUTE_UNUSED,
 	  targetm.asm_out.function_switched_text_sections (asm_out_file,
 							   current_function_decl,
 							   in_cold_section_p);
+	  /* Emit a label for the split cold section.  Form label name by
+	     suffixing "cold" to the original function's name.  */
+	  if (in_cold_section_p)
+	    {
+	      tree cold_function_name
+		= clone_function_name (current_function_decl, "cold");
+	      ASM_OUTPUT_LABEL (asm_out_file,
+				IDENTIFIER_POINTER (cold_function_name));
+	    }
 	  break;
 
 	case NOTE_INSN_BASIC_BLOCK:

gcc/testsuite/ChangeLog

+2013-11-19  Sriraman Tallam  <tmsriram@google.com>
+
+	* gcc.dg/tree-prof/cold_partition_label.c: New testcase.
+
 2013-11-19  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
 
 	* gcc.target/powerpc/ppc64-abi-2.c (MAKE_SLOT): New macro to

gcc/testsuite/gcc.dg/tree-prof/cold_partition_label.c

+/* Test case to check if function foo gets split and the cold function
+   gets a label.  */
+/* { dg-require-effective-target freorder } */
+/* { dg-options "-O2 -freorder-blocks-and-partition --save-temps" } */
+
+#define SIZE 10000
+
+const char *sarr[SIZE];
+const char *buf_hot;
+const char *buf_cold;
+
+__attribute__((noinline))
+void 
+foo (int path)
+{
+  int i;
+  if (path)
+    {
+      for (i = 0; i < SIZE; i++)
+	sarr[i] = buf_hot;
+    }
+  else
+    {
+      for (i = 0; i < SIZE; i++)
+	sarr[i] = buf_cold;
+    }
+}
+
+int
+main (int argc, char *argv[])
+{
+  buf_hot =  "hello";
+  buf_cold = "world";
+  foo (argc);
+  return 0;
+}