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;; Constraint definitions for OpenRISC
;; Copyright (C) 2018-2020 Free Software Foundation, Inc.
;; Contributed by Stafford Horne
;; 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/>.
;; -------------------------------------------------------------------------
;; Constraints
;; -------------------------------------------------------------------------
; We use:
; c - sibcall registers
; d - double pair base registers (excludes r0, r30 and r31 which overflow)
; t - got address registers (excludes LR (r9) which is clobbered by set_got)
; I - constant signed 16-bit
; K - constant unsigned 16-bit
; M - constant signed 16-bit shifted left 16-bits (l.movhi)
; O - constant zero
(define_register_constraint "c" "SIBCALL_REGS"
"Registers which can hold a sibling call address")
(define_register_constraint "d" "DOUBLE_REGS"
"Registers which can be used for double reg pairs.")
(define_register_constraint "t" "GOT_REGS"
"Registers which can be used to store the Global Offset Table (GOT) address.")
;; Immediates
(define_constraint "I"
"A signed 16-bit immediate in the range -32768 to 32767."
(and (match_code "const_int")
(match_test "IN_RANGE (ival, -32768, 32767)")))
(define_constraint "K"
"An unsigned 16-bit immediate in the range 0 to 0xffff."
(and (match_code "const_int")
(match_test "IN_RANGE (ival, 0, 65535)")))
(define_constraint "M"
"A shifted signed 16-bit constant suitable for l.movhi."
(and (match_code "const_int")
(match_test "(ival & 0xffff) == 0
&& (ival >> 31 == -1 || ival >> 31 == 0)")))
(define_constraint "O"
"The constant zero"
(and (match_code "const_int")
(match_test "ival == 0")))
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