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riscv: Simplify output of MEM addresses
We have the following situation for MEM RTX objects: * TARGET_PRINT_OPERAND expands to riscv_print_operand() * This falls into the default case (unknown or on letter) of the outer switch-case-block and the MEM case of the inner switch-case-block and calls output_address() in final.cc with XEXP (op, 0) (the address) * This calls targetm.asm_out.print_operand_address() which is riscv_print_operand_address() * riscv_print_operand_address() is targeting the address of a MEM RTX * riscv_print_operand_address() calls riscv_print_operand() for the offset and directly prints the register if the address is classified as ADDRESS_REG * This falls into the default case (unknown or on letter) of the outer switch-case-block and the default case of the inner switch-case-block and calls output_addr_const(). However, since we know that offset must be a CONST_INT (which will be followed by a '(<reg>)' string), there is no need to call riscv_print_operand() for the offset. Instead we can take the shortcut and use output_addr_const(). This change also brings the code in riscv_print_operand_address() in line with the other cases, where output_addr_const() is used to print offsets. Tested with GCC regression test suite and SPEC intrate. Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>
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