* expmed.h (canonicalize_comparison): New declaration.
	* expmed.c (canonicalize_comparison, equivalent_cmp_code): New function.
	* expmed.c (emit_store_flag_1): Add call to canonicalize_comparison.
	* optabs.c (prepare_cmp_insn): Likewise.
	* rtl.h (unsigned_condition_p): New function which checks if a
	comparison operator is unsigned.

	* gcc.target/aarch64/imm_choice_comparison.c: New test.

From-SVN: r263591