cselim: Extend to check non-trapping for more references [PR89430]

If there is a dominating store, a store to the same reference can not be
trapped.  But previously, it only supports such check on MEM_REFs.
So this patch extends it to support ARRAY_REFs and COMPONENT_REFs.

This patch also supports a special case: if there is a dominating load of
local variable without address escape, a store is not trapped, as local
stack is always writable.  Other loads are ignored for simplicity, as they
don't help to check if a store can be trapped (the memory may be read-only).

gcc/ChangeLog:

	PR tree-optimization/89430
	* tree-ssa-phiopt.c
	(struct name_to_bb): Rename to ref_to_bb; add a new field exp;
	remove ssa_name_ver, store, offset fields.
	(struct ssa_names_hasher): Rename to refs_hasher; update functions.
	(class nontrapping_dom_walker): Rename m_seen_ssa_names to m_seen_refs.
	(nontrapping_dom_walker::add_or_mark_expr): Extend to support ARRAY_REFs
	and COMPONENT_REFs.

gcc/testsuite/ChangeLog:

	PR tree-optimization/89430
	* gcc.dg/tree-ssa/pr89430-1.c: Remove xfail.
	* gcc.dg/tree-ssa/pr89430-2.c: Remove xfail.
	* gcc.dg/tree-ssa/pr89430-5.c: Remove xfail.
	* gcc.dg/tree-ssa/pr89430-6.c: Remove xfail.
	* gcc.dg/tree-ssa/pr89430-7-comp-ref.c: New test.
	* gcc.dg/tree-ssa/pr89430-8-mem-ref-size.c: New test.
	* gcc.dg/tree-ssa/ssa-pre-17.c: Add -fno-tree-cselim.

0 files changed, 0 insertions, 0 deletions