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[PATCH] Add test for memcpy expansion with hint.


Hi.

i386 target uses hint-based expansion of memcpy-like and memset-like functions.
I would like to add a test in order to cover the functionality.

Ready for trunk?
Martin

gcc/ChangeLog:

2018-08-13  Martin Liska  <mliska@suse.cz>

	* config/i386/i386.c (ix86_expand_set_or_movmem): Dump
        selected expansion strategy.

gcc/testsuite/ChangeLog:

2018-08-13  Martin Liska  <mliska@suse.cz>

	* gcc.dg/tree-prof/val-prof-10.c: New test.
---
 gcc/config/i386/i386.c                       |  5 ++++
 gcc/testsuite/gcc.dg/tree-prof/val-prof-10.c | 31 ++++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 gcc/testsuite/gcc.dg/tree-prof/val-prof-10.c


diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 7554fd1f659..db1c4031a3f 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -27632,6 +27632,11 @@ 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);
diff --git a/gcc/testsuite/gcc.dg/tree-prof/val-prof-10.c b/gcc/testsuite/gcc.dg/tree-prof/val-prof-10.c
new file mode 100644
index 00000000000..57854b5911b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-prof/val-prof-10.c
@@ -0,0 +1,31 @@
+/* { 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" } } */


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