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;; Constraint definitions for Renesas H8/300.
;; Copyright (C) 2011-2013 Free Software Foundation, Inc.
;;
;; This file is part of GCC.
;;
;; GCC is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;;
;; GCC is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with GCC; see the file COPYING3. If not see
;; <http://www.gnu.org/licenses/>.
;; Register constraints.
(define_register_constraint "a" "MAC_REGS"
"@internal")
(define_register_constraint "c" "COUNTER_REGS"
"@internal")
;; Some patterns need to use er6 as a scratch register. This is
;; difficult to arrange since er6 is the frame pointer and usually can't
;; be spilled.
;; Such patterns should define two alternatives, one which allows only
;; er6 and one which allows any general register. The former
;; alternative should have a 'd' constraint while the latter should be
;; disparaged and use 'D'.
;; Normally, 'd' maps to DESTINATION_REGS and 'D' maps to GENERAL_REGS.
;; However, there are cases where they should be NO_REGS:
;; - 'd' should be NO_REGS when reloading a function that uses the
;; frame pointer. In this case, DESTINATION_REGS won't contain any
;; spillable registers, so the first alternative can't be used.
;; - -fno-omit-frame-pointer means that the frame pointer will
;; always be in use. It's therefore better to map 'd' to NO_REGS
;; before reload so that register allocator will pick the second
;; alternative.
;; - we would like 'D' to be be NO_REGS when the frame pointer isn't
;; live, but we the frame pointer may turn out to be needed after
;; we start reload, and then we may have already decided we don't
;; have a choice, so we can't do that. Forcing the register
;; allocator to use er6 if possible might produce better code for
;; small functions: it's more efficient to save and restore er6 in
;; the prologue & epilogue than to do it in a define_split.
;; Hopefully disparaging 'D' will have a similar effect, without
;; forcing a reload failure if the frame pointer is found to be
;; needed too late.
(define_register_constraint "d"
"(!flag_omit_frame_pointer && !reload_completed
? NO_REGS
: (frame_pointer_needed && reload_in_progress
? NO_REGS
: DESTINATION_REGS))"
"@internal")
(define_register_constraint "D" "GENERAL_REGS"
"@internal")
(define_register_constraint "f" "SOURCE_REGS"
"@internal")
;; Integer constraints.
(define_constraint "I"
"Integer zero."
(and (match_code "const_int")
(match_test "ival == 0")))
(define_constraint "J"
"An integer with its low byte clear."
(and (match_code "const_int")
(match_test "(ival & 0xff) == 0")))
(define_constraint "L"
"1, 2 or 4 on the H8300H or S; 1 or 2 otherwise."
(and (match_code "const_int")
(if_then_else (match_test "TARGET_H8300H || TARGET_H8300S")
(match_test "ival == 1 || ival == 2 || ival == 4")
(match_test "ival == 1 || ival == 2"))))
(define_constraint "M"
"Integer 1 or 2."
(and (match_code "const_int")
(match_test "ival == 1 || ival == 2")))
(define_constraint "N"
"-1, -2, or -4 on the H8300H or S; -1 or -2 otherwise."
(and (match_code "const_int")
(if_then_else (match_test "TARGET_H8300H || TARGET_H8300S")
(match_test "ival == -1 || ival == -2 || ival == -4")
(match_test "ival == -1 || ival == -2"))))
(define_constraint "O"
"Integer -1 or -2."
(and (match_code "const_int")
(match_test "ival == -1 || ival == -2")))
(define_constraint "P1>X"
"A positive, non-zero integer that fits in 1 bits."
(and (match_code "const_int")
(match_test "TARGET_H8300SX")
(match_test "IN_RANGE (ival, 1, (1 << 1) - 1)")))
(define_constraint "P3>X"
"A positive, non-zero integer that fits in 3 bits."
(and (match_code "const_int")
(match_test "TARGET_H8300SX")
(match_test "IN_RANGE (ival, 1, (1 << 3) - 1)")))
(define_constraint "P4>X"
"A positive, non-zero integer that fits in 4 bits."
(and (match_code "const_int")
(match_test "TARGET_H8300SX")
(match_test "IN_RANGE (ival, 1, (1 << 4) - 1)")))
(define_constraint "P5>X"
"A positive, non-zero integer that fits in 5 bits."
(and (match_code "const_int")
(match_test "TARGET_H8300SX")
(match_test "IN_RANGE (ival, 1, (1 << 5) - 1)")))
(define_constraint "P8>X"
"A positive, non-zero integer that fits in 8 bits."
(and (match_code "const_int")
(match_test "TARGET_H8300SX")
(match_test "IN_RANGE (ival, 1, (1 << 8) - 1)")))
(define_constraint "P3<X"
"A negative, non-zero integer that fits in 3 bits."
(and (match_code "const_int")
(match_test "TARGET_H8300SX")
(match_test "IN_RANGE (ival, (-(1 << 3)) + 1, -1)")))
;; Floating-point constraints.
(define_constraint "G"
"Single-float zero."
(and (match_code "const_double")
(match_test "op == CONST0_RTX (SFmode)")))
;; Extra constraints.
(define_constraint "Q"
"@internal"
(and (match_test "TARGET_H8300SX")
(match_operand 0 "memory_operand")))
(define_constraint "R"
"@internal"
(and (match_code "const_int")
(match_test "!h8300_shift_needs_scratch_p (ival, QImode)")))
(define_constraint "S"
"@internal"
(and (match_code "const_int")
(match_test "!h8300_shift_needs_scratch_p (ival, HImode)")))
(define_constraint "T"
"@internal"
(and (match_code "const_int")
(match_test "!h8300_shift_needs_scratch_p (ival, SImode)")))
(define_constraint "U"
"An operand valid for a bset destination."
(ior (and (match_code "reg")
(match_test "REG_OK_FOR_BASE_P (op)"))
(and (match_code "mem")
(match_code "reg" "0")
(match_test "REG_OK_FOR_BASE_P (XEXP (op, 0))"))
(and (match_code "mem")
(match_code "symbol_ref" "0")
(match_test "TARGET_H8300S"))
(and (match_code "mem")
(match_code "const" "0")
(match_code "plus" "00")
(match_code "symbol_ref" "000")
(match_code "const_int" "001")
(ior (match_test "TARGET_H8300S")
(match_test "SYMBOL_REF_FLAG (XEXP (XEXP (XEXP (op, 0), 0), 0))")))
(and (match_code "mem")
(match_test "h8300_eightbit_constant_address_p (XEXP (op, 0))"))
(and (match_code "mem")
(ior (match_test "TARGET_H8300S")
(match_test "TARGET_H8300SX"))
(match_code "const_int" "0"))))
(define_memory_constraint "WU"
"@internal"
(and (match_code "mem")
(match_test "satisfies_constraint_U (op)")))
(define_constraint "Y0"
"@internal"
(and (match_code "const_int")
(match_test "exact_log2 (~ival & 0xff) != -1")))
(define_constraint "Y2"
"@internal"
(and (match_code "const_int")
(match_test "exact_log2 (ival & 0xff) != -1")))
(define_constraint "Z"
"@internal"
(and (match_test "TARGET_H8300SX")
(match_code "mem")
(match_test "CONSTANT_P (XEXP (op, 0))")))
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