rs6000.c (toplevel): Include attribs.h.

[gcc]
2017-06-05  Michael Meissner  <meissner@linux.vnet.ibm.com>

	* config/rs6000/rs6000.c (toplevel): Include attribs.h.
	(CLONE_*): New constants to define the processors we can generate
	code for with the target_clone attribute.
	(rs6000_clone_map): New array to identify which clone processors
	the current program is running on.
	(TARGET_COMPARE_VERSION_PRIORITY): Define to enable the
	target_clone attribute.
	(TARGET_GENERATE_VERSION_DISPATCHER_BODY): Likewise.
	(TARGET_GET_FUNCTION_VERSIONS_DISPATCHER): Likewise.
	(TARGET_OPTION_FUNCTION_VERSIONS): Likewise.
	(cpu_expand_builtin): Add support for target_clone attribute.
	(rs6000_valid_attribute_p): Allow "default" attribute.
	(get_decl_name): New debug function to simplify printing the
	current function name in debugging statements.
	(rs6000_clone_priority): New functions to support the target_clone
	attribute, and be able to generate code to switch between ISA 2.05
	through ISA 3.0 (power6 through power9).
	(rs6000_compare_version_priority): Likewise.
	(rs6000_get_function_versions_dispatcher): Likewise.
	(make_resolver_func): Likewise.
	(add_condition_to_bb): Likewise.
	(dispatch_function_versions): Likewise.
	(rs6000_generate_version_dispatcher_body): Likewise.
	(rs6000_can_inline_p): Call get_decl_name for debugging usage.
	(fusion_gpr_load_p): Fix a spacing issue.
	* doc/extend.texi (Common Function Attributes): Document that the
	PowerPC supports the target_clone attribute.

[gcc/testsuite]
2017-06-05  Michael Meissner  <meissner@linux.vnet.ibm.com>

	* gcc.target/powerpc/clone1.c: New test.

From-SVN: r248883

gcc/ChangeLog

+2017-06-05  Michael Meissner  <meissner@linux.vnet.ibm.com>
+
+	* config/rs6000/rs6000.c (toplevel): Include attribs.h.
+	(CLONE_*): New constants to define the processors we can generate
+	code for with the target_clone attribute.
+	(rs6000_clone_map): New array to identify which clone processors
+	the current program is running on.
+	(TARGET_COMPARE_VERSION_PRIORITY): Define to enable the
+	target_clone attribute.
+	(TARGET_GENERATE_VERSION_DISPATCHER_BODY): Likewise.
+	(TARGET_GET_FUNCTION_VERSIONS_DISPATCHER): Likewise.
+	(TARGET_OPTION_FUNCTION_VERSIONS): Likewise.
+	(cpu_expand_builtin): Add support for target_clone attribute.
+	(rs6000_valid_attribute_p): Allow "default" attribute.
+	(get_decl_name): New debug function to simplify printing the
+	current function name in debugging statements.
+	(rs6000_clone_priority): New functions to support the target_clone
+	attribute, and be able to generate code to switch between ISA 2.05
+	through ISA 3.0 (power6 through power9).
+	(rs6000_compare_version_priority): Likewise.
+	(rs6000_get_function_versions_dispatcher): Likewise.
+	(make_resolver_func): Likewise.
+	(add_condition_to_bb): Likewise.
+	(dispatch_function_versions): Likewise.
+	(rs6000_generate_version_dispatcher_body): Likewise.
+	(rs6000_can_inline_p): Call get_decl_name for debugging usage.
+	(fusion_gpr_load_p): Fix a spacing issue.
+	* doc/extend.texi (Common Function Attributes): Document that the
+	PowerPC supports the target_clone attribute.
+
 2017-06-05  Thomas Preud'homme  <thomas.preudhomme@arm.com>
 
 	* config/arm/arm.h: explain F symbol found in description of ARM

gcc/doc/extend.texi

@@ -3257,7 +3257,15 @@ For instance, on an x86, you could compile a function with
 @code{target_clones("sse4.1,avx")}.  GCC creates two function clones,
 one compiled with @option{-msse4.1} and another with @option{-mavx}.
 It also creates a resolver function (see the @code{ifunc} attribute
-above) that dynamically selects a clone suitable for current architecture.
+above) that dynamically selects a clone suitable for current
+architecture.
+
+On a PowerPC, you can compile a function with
+@code{target_clones("cpu=power9,default")}.  GCC will create two
+function clones, one compiled with @option{-mcpu=power9} and another
+with the default options.  It also creates a resolver function (see
+the @code{ifunc} attribute above) that dynamically selects a clone
+suitable for current architecture.
 
 @item unused
 @cindex @code{unused} function attribute

gcc/testsuite/ChangeLog

+2017-06-05  Michael Meissner  <meissner@linux.vnet.ibm.com>
+
+	* gcc.target/powerpc/clone1.c: New test.
+
 2017-06-05  Janus Weil  <janus@gcc.gnu.org>
 
 	PR fortran/70601

gcc/testsuite/gcc.target/powerpc/clone1.c

+/* { dg-do compile { target { powerpc*-*-linux* && lp64 } } } */
+/* { dg-skip-if "do not override -mcpu" { powerpc*-*-* } { "-mcpu=*" } { "-mcpu=power8" } } */
+/* { dg-options "-mcpu=power8 -O2" } */
+/* { dg-require-effective-target powerpc_p9vector_ok } */
+
+/* Power9 (aka, ISA 3.0) has a MODSD instruction to do modulus, while Power8
+   (aka, ISA 2.07) has to do modulus with divide and multiply.  Make sure
+   both clone functions are generated.
+
+   Restrict ourselves to Linux, since IFUNC might not be supported in other
+   operating systems.  */
+
+__attribute__((target_clones("cpu=power9,default")))
+long mod_func (long a, long b)
+{
+  return a % b;
+}
+
+long mod_func_or (long a, long b, long c)
+{
+  return mod_func (a, b) | c;
+}
+
+/* { dg-final { scan-assembler-times {\mdivd\M}  1 } } */
+/* { dg-final { scan-assembler-times {\mmulld\M} 1 } } */
+/* { dg-final { scan-assembler-times {\mmodsd\M} 1 } } */