Patch for performing interprocedural bitwise constant propagation.

2016-08-26  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
	    Martin Jambhor  <mjambor@suse.cz>

	* common.opt: New option -fipa-bit-cp.
	* doc/invoke.texi: Document -fipa-bit-cp.
	* opts.c (default_options_table): Add entry for -fipa-bit-cp.
	(enable_fdo_optimizations): Check for flag_ipa_bit_cp.
	* tree-ssa-ccp.h: New header file.
	* tree-ssa-ccp.c: Include tree-ssa-ccp.h
	(bit_value_binop_1): Change to bit_value_binop_1 and export it.
	Replace all occurences of tree parameter by two new params: signop, int.
	(bit_value_unop_1): Change to bit_value_unop and export it.
	Replace all occurences of tree parameter by two new params: signop,
	int.
	(bit_value_binop): Change call from bit_value_binop_1 to
	bit_value_binop.
	(bit_value_assume_aligned): Likewise.
	(bit_value_unop): Change call from bit_value_unop_1 to bit_value_unop.
	(do_ssa_ccp): Pass nonzero_p || flag_ipa_cp_bit instead of nonzero_p
	to ccp_finalize.
	(ccp_finalize): Skip processing if val->mask == 0.
	* ipa-cp.c: Include tree-ssa-ccp.h
	(ipcp_bits_lattice): New class.
	(ipcp_param_lattice (bits_lattice): New member.
	(print_all_lattices): Call ipcp_bits_lattice::print.
	(set_all_contains_variable): Call ipcp_bits_lattice::set_to_bottom. 
	(initialize_node_lattices): Likewise.
	(propagate_bits_accross_jump_function): New function.
	(propagate_constants_accross_call): Call
	propagate_bits_accross_jump_function.
	(ipcp_propagate_stage): Store parameter types when in_lto_p is true.
	(ipcp_store_bits_results): New function.
	(ipcp_driver): Call ipcp_store_bits_results.
	* ipa-prop.h (ipa_bits): New struct.
	(ipa_jump_func): Add new member bits of type ipa_bits.
	(ipa_param_descriptor): Change decl to decl_or_type.
	(ipa_get_param): Change decl to decl_or_type and assert on
	PARM_DECL.
	(ipa_get_type): New function.
	(ipcp_transformation_summary): New member bits.
	* ipa-prop.c (ipa_get_param_decl_index_1): s/decl/decl_or_type.
	(ipa_populate_param_decls): Likewise.
	(ipa_dump_param): Likewise.
	(ipa_print_node_jump_functions_for_edge): Pretty-print ipa_bits jump
	function.
	(ipa_set_jf_unknown): Set ipa_bits::known to false.
	(ipa_compute_jump_functions_for_edge): Compute jump function for bits
	propagation.
	(ipa_node_params_t::duplicate): Copy src->bits into dst->bits.
	(ipa_write_jump_function): Add streaming for ipa_bits.
	(ipa_read_jump_function): Add support for reading streamed ipa_bits.
	(write_ipcp_transformation_info): Add streaming for ipa_bits
	summary for ltrans.
	(read_ipcp_transfomration_info): Add support for reading streamed ipa_bits.
	(ipcp_update_bits): New function.
	(ipcp_transform_function): Call ipcp_update_bits.

testsuite/
	* gcc.dg/ipa/propbits-1.c: New test-case.
	* gcc.dg/ipa/propbits-2.c: Likewise.
	* gcc.dg/ipa/propbits-3.c: Likewise.

Co-Authored-By: Martin Jambor <mjambor@suse.cz>

From-SVN: r239769

1 files changed, 8 insertions, 1 deletions

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 1f04501..baae0bd 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -358,7 +358,7 @@ Objective-C and Objective-C++ Dialects}.
 -fgcse-sm -fhoist-adjacent-loads -fif-conversion @gol
 -fif-conversion2 -findirect-inlining @gol
 -finline-functions -finline-functions-called-once -finline-limit=@var{n} @gol
--finline-small-functions -fipa-cp -fipa-cp-clone -fipa-cp-alignment @gol
+-finline-small-functions -fipa-cp -fipa-cp-clone -fipa-cp-alignment -fipa-bit-cp @gol
 -fipa-pta -fipa-profile -fipa-pure-const -fipa-reference -fipa-icf @gol
 -fira-algorithm=@var{algorithm} @gol
 -fira-region=@var{region} -fira-hoist-pressure @gol
@@ -6370,6 +6370,7 @@ also turns on the following optimization flags:
 -findirect-inlining @gol
 -fipa-cp @gol
 -fipa-cp-alignment @gol
+-fipa-bit-cp @gol
 -fipa-sra @gol
 -fipa-icf @gol
 -fisolate-erroneous-paths-dereference @gol
@@ -7378,6 +7379,12 @@ parameters to support better vectorization and string operations.
 This flag is enabled by default at @option{-O2} and @option{-Os}.  It
 requires that @option{-fipa-cp} is enabled.
 
+@item -fipa-bit-cp
+@opindex -fipa-bit-cp
+When enabled, perform ipa bitwise constant propagation. This flag is
+enabled by default at @option{-O2}. It requires that @option{-fipa-cp}
+is enabled.
+
 @item -fipa-icf
 @opindex fipa-icf
 Perform Identical Code Folding for functions and read-only variables.