Make mempcpy more optimal (PR middle-end/70140).

2017-08-01  Martin Liska  <mliska@suse.cz>

	PR middle-end/70140
	* gcc.dg/string-opt-1.c: Adjust test-case to scan for memcpy.
2017-08-01  Martin Liska  <mliska@suse.cz>

	PR middle-end/70140
	* builtins.c (expand_builtin_memcpy_args): Remove.
	(expand_builtin_memcpy): Call newly added function
	expand_builtin_memory_copy_args.
	(expand_builtin_memcpy_with_bounds): Likewise.
	(expand_builtin_mempcpy): Remove last argument.
	(expand_builtin_mempcpy_with_bounds): Likewise.
	(expand_builtin_memory_copy_args): New function created from
	expand_builtin_mempcpy_args with small modifications.
	(expand_builtin_mempcpy_args): Remove.
	(expand_builtin_stpcpy): Remove unused argument.
	(expand_builtin): Likewise.
	(expand_builtin_with_bounds): Likewise.

From-SVN: r250771

gcc/ChangeLog

+2017-08-01  Martin Liska  <mliska@suse.cz>
+
+	PR middle-end/70140
+	* builtins.c (expand_builtin_memcpy_args): Remove.
+	(expand_builtin_memcpy): Call newly added function
+	expand_builtin_memory_copy_args.
+	(expand_builtin_memcpy_with_bounds): Likewise.
+	(expand_builtin_mempcpy): Remove last argument.
+	(expand_builtin_mempcpy_with_bounds): Likewise.
+	(expand_builtin_memory_copy_args): New function created from
+	expand_builtin_mempcpy_args with small modifications.
+	(expand_builtin_mempcpy_args): Remove.
+	(expand_builtin_stpcpy): Remove unused argument.
+	(expand_builtin): Likewise.
+	(expand_builtin_with_bounds): Likewise.
+
 2017-08-01  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/81641

gcc/testsuite/ChangeLog

+2017-08-01  Martin Liska  <mliska@suse.cz>
+
+	PR middle-end/70140
+	* gcc.dg/string-opt-1.c: Adjust test-case to scan for memcpy.
+
 2017-08-01  Tamar Christina  <tamar.christina@arm.com>
 
 	* gcc.target/aarch64/dbl_mov_immediate_1.c:

gcc/testsuite/gcc.dg/string-opt-1.c

-/* Ensure mempcpy is not "optimized" into memcpy followed by addition.  */
+/* Ensure mempcpy is "optimized" into memcpy followed by addition.  */
 /* { dg-do compile } */
 /* { dg-options "-O2" } */
 
@@ -8,4 +8,5 @@ fn (char *x, char *y, int z)
   return __builtin_mempcpy (x, y, z);
 }
 
-/* { dg-final { scan-assembler-not "memcpy" } } */
+/* { dg-final { scan-assembler-not "mempcpy" } } */
+/* { dg-final { scan-assembler "memcpy" } } */