2008-06-04  Xinliang David Li  <davidxl@google.com>

	* tree-call-cdce.c: New file. 
	(cond_dead_built_in_calls): New static variable.
	(input_domain): New struct.
	(check_pow): New function.
	(check_builtin_call): Ditto.
	(check_target_format): Ditto.
	(is_call_dce_candidate): Ditto.
	(gen_one_condition): Ditto.
	(gen_conditions_for_domain): Ditto.
	(get_domain): Ditto.
	(gen_conditions_for_pow_cst_base): Ditto.
	(gen_conditions_for_pow_int_base): Ditto.
	(gen_conditions_for_pow): Ditto.
	(get_no_error_domain): Ditto.
	(gen_shrink_wrap_conditions): Ditto.
	(shrink_wrap_one_built_in_call): Ditto.
	(shink_wrap_conditional_dead_built_in_calls): Ditto.
	(tree_call_cdce): Ditto.
	(gate_call_cdce): Ditto.
	(pass_call_cdce): New gimple pass.
	* passes.c: (init_optimization_passes): New pass.
	* tree-pass.h: New pass declaration.
	* opts.c (decode_options): New flag setting.
	* common.opt: Add -ftree-builtin-call-dce flag.
	* Makefile.in: Add new source file.
	* tempvar.def: New tv_id.
	* doc/invoke.texi (-ftree-builtin-call-dce): New flag.

2008-06-04  Xinliang David Li  <davidxl@google.com>
	* gcc.dg/cdce1.c: New test.
	* gcc.dg/cdce2.c: Ditto.
	* g++.dg/cdce3.C: Ditto.

From-SVN: r136374