Add test for memcpy expansion with hint.

2018-08-27  Martin Liska  <mliska@suse.cz>

	* config/i386/i386.c (ix86_expand_set_or_movmem): Dump
        selected expansion strategy.
2018-08-27  Martin Liska  <mliska@suse.cz>

	* gcc.dg/tree-prof/val-prof-10.c: New test.

From-SVN: r263881

gcc/ChangeLog

 2018-08-27  Martin Liska  <mliska@suse.cz>
 
+	* config/i386/i386.c (ix86_expand_set_or_movmem): Dump
+        selected expansion strategy.
+
+2018-08-27  Martin Liska  <mliska@suse.cz>
+
 	* builtins.h (is_builtin_fn): Remove and fndecl_built_in_p.
 	* builtins.c (is_builtin_fn): Likewise.
 	* attribs.c (diag_attr_exclusions): Use new function

gcc/config/i386/i386.c

@@ -27530,6 +27530,11 @@ ix86_expand_set_or_movmem (rtx dst, rtx src, rtx count_exp, rtx val_exp,
 		    issetmem,
 		    issetmem && val_exp == const0_rtx, have_as,
 		    &dynamic_check, &noalign, false);
+
+  if (dump_file)
+    fprintf (dump_file, "Selected stringop expansion strategy: %s\n",
+	     stringop_alg_names[alg]);
+
   if (alg == libcall)
     return false;
   gcc_assert (alg != no_stringop);

gcc/testsuite/ChangeLog

 2018-08-27  Martin Liska  <mliska@suse.cz>
 
+	* gcc.dg/tree-prof/val-prof-10.c: New test.
+
+2018-08-27  Martin Liska  <mliska@suse.cz>
+
         PR tree-optimization/86847
 	* gcc.dg/tree-ssa/switch-3.c: New test.
 	* gcc.dg/tree-ssa/vrp105.c: Remove.

gcc/testsuite/gcc.dg/tree-prof/val-prof-10.c

+/* { dg-options "-O2 -fdump-rtl-expand -mtune=core2" } */
+/* { dg-skip-if "" { ! { i?86-*-* x86_64-*-* } } } */
+
+long buffer1[128], buffer2[128];
+char *x;
+
+void foo(long *r)
+{
+  x = (char *)r;
+  asm volatile("" ::: "memory");
+}
+
+void
+__attribute__((noinline))
+compute()
+{
+  volatile int n = 24;
+  __builtin_memcpy (buffer1, buffer2, n);
+  foo (&buffer1[0]);
+}
+
+int
+main()
+{
+  for (unsigned i = 0; i < 10000; i++)
+    compute ();
+
+  return 0;
+}
+
+/* { dg-final-use-not-autofdo { scan-rtl-dump "Selected stringop expansion strategy: rep_byte" "expand" } } */