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;; Constraints definitions belonging to the gcc backend for IBM S/390.
;; Copyright (C) 2006 Free Software Foundation, Inc.
;; Written by Wolfgang Gellerich, using code and information found in
;; files s390.md, s390.h, and s390.c.
;;
;; 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 2, 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 COPYING. If not, write to the Free
;; Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
;; 02110-1301, USA.
;;
;; Special constraints for s/390 machine description:
;;
;; a -- Any address register from 1 to 15.
;; c -- Condition code register 33.
;; d -- Any register from 0 to 15.
;; f -- Floating point registers.
;; t -- Access registers 36 and 37.
;; G -- Const double zero operand
;; I -- An 8-bit constant (0..255).
;; J -- A 12-bit constant (0..4095).
;; K -- A 16-bit constant (-32768..32767).
;; L -- Value appropriate as displacement.
;; (0..4095) for short displacement
;; (-524288..524287) for long displacement
;; M -- Constant integer with a value of 0x7fffffff.
;; N -- Multiple letter constraint followed by 4 parameter letters.
;; 0..9,x: number of the part counting from most to least significant
;; H,Q: mode of the part
;; D,S,H: mode of the containing operand
;; 0,F: value of the other parts (F - all bits set)
;;
;; The constraint matches if the specified part of a constant
;; has a value different from its other parts. If the letter x
;; is specified instead of a part number, the constraint matches
;; if there is any single part with non-default value.
;; O -- Multiple letter constraint followed by 1 parameter.
;; s: Signed extended immediate value (-2G .. 2G-1).
;; p: Positive extended immediate value (0 .. 4G-1).
;; n: Negative extended immediate value (-4G .. -1).
;; These constraints do not accept any operand if the machine does
;; not provide the extended-immediate facility.
;; P -- Any integer constant that can be loaded without literal pool.
;; Q -- Memory reference without index register and with short displacement.
;; R -- Memory reference with index register and short displacement.
;; S -- Memory reference without index register but with long displacement.
;; T -- Memory reference with index register and long displacement.
;; A -- Multiple letter constraint followed by Q, R, S, or T:
;; Offsettable memory reference of type specified by second letter.
;; B -- Multiple letter constraint followed by Q, R, S, or T:
;; Memory reference of the type specified by second letter that
;; does *not* refer to a literal pool entry.
;; U -- Pointer with short displacement.
;; W -- Pointer with long displacement.
;; Y -- Shift count operand.
;;
;;
;; Register constraints.
;;
(define_register_constraint "a"
"ADDR_REGS"
"Any address register from 1 to 15.")
(define_register_constraint "c"
"CC_REGS"
"Condition code register 33")
(define_register_constraint "d"
"GENERAL_REGS"
"Any register from 0 to 15")
(define_register_constraint "f"
"FP_REGS"
"Floating point registers")
(define_register_constraint "t"
"ACCESS_REGS"
"@internal
Access registers 36 and 37")
;;
;; General constraints for constants.
;;
(define_constraint "G"
"@internal
Const double zero operand"
(and (match_code "const_double")
(match_test "s390_float_const_zero_p (op)")))
(define_constraint "I"
"An 8-bit constant (0..255)"
(and (match_code "const_int")
(match_test "(unsigned int) ival <= 255")))
(define_constraint "J"
"A 12-bit constant (0..4095)"
(and (match_code "const_int")
(match_test "(unsigned int) ival <= 4095")))
(define_constraint "K"
"A 16-bit constant (-32768..32767)"
(and (match_code "const_int")
(match_test "ival >= -32768 && ival <= 32767")))
(define_constraint "L"
"Value appropriate as displacement.
(0..4095) for short displacement
(-524288..524287) for long displacement"
(and (match_code "const_int")
(match_test "TARGET_LONG_DISPLACEMENT ?
(ival >= -524288 && ival <= 524287)
: (ival >= 0 && ival <= 4095)")))
(define_constraint "M"
"Constant integer with a value of 0x7fffffff"
(and (match_code "const_int")
(match_test "ival == 2147483647")))
(define_constraint "P"
"@internal
Any integer constant that can be loaded without literal pool"
(and (match_code "const_int")
(match_test "legitimate_reload_constant_p (GEN_INT (ival))")))
(define_address_constraint "Y"
"Shift count operand"
;; Simply check for the basic form of a shift count. Reload will
;; take care of making sure we have a proper base register.
(match_test "s390_decompose_shift_count (op, NULL, NULL)" ))
;; N -- Multiple letter constraint followed by 4 parameter letters.
;; 0..9,x: number of the part counting from most to least significant
;; H,Q: mode of the part
;; D,S,H: mode of the containing operand
;; 0,F: value of the other parts (F = all bits set)
;;
;; The constraint matches if the specified part of a constant
;; has a value different from its other parts. If the letter x
;; is specified instead of a part number, the constraint matches
;; if there is any single part with non-default value.
;;
;; The following patterns define only those constraints that are actually
;; used in s390.md. If you need an additional one, simply add it in the
;; obvious way. Function s390_N_constraint_str is ready to handle all
;; combinations.
;;
(define_constraint "NxQS0"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"xQS0\", ival)")))
(define_constraint "NxQD0"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"xQD0\", ival)")))
(define_constraint "N3HD0"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"3HD0\", ival)")))
(define_constraint "N2HD0"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"2HD0\", ival)")))
(define_constraint "N1SD0"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"1SD0\", ival)")))
(define_constraint "N1HS0"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"1HS0\", ival)")))
(define_constraint "N1HD0"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"1HD0\", ival)")))
(define_constraint "N0SD0"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"0SD0\", ival)")))
(define_constraint "N0HS0"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"0HS0\", ival)")))
(define_constraint "N0HD0"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"0HD0\", ival)")))
(define_constraint "NxQDF"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"xQDF\", ival)")))
(define_constraint "N1SDF"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"1SDF\", ival)")))
(define_constraint "N0SDF"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"0SDF\", ival)")))
(define_constraint "N3HDF"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"3HDF\", ival)")))
(define_constraint "N2HDF"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"2HDF\", ival)")))
(define_constraint "N1HDF"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"1HDF\", ival)")))
(define_constraint "N0HDF"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"0HDF\", ival)")))
(define_constraint "N0HSF"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"0HSF\", ival)")))
(define_constraint "N1HSF"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"1HSF\", ival)")))
(define_constraint "NxQSF"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"xQSF\", ival)")))
(define_constraint "NxQHF"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"xQHF\", ival)")))
(define_constraint "NxQH0"
"@internal"
(and (match_code "const_int")
(match_test "s390_N_constraint_str (\"xQH0\", ival)")))
;;
;; Double-letter constraints starting with O follow.
;;
(define_constraint "Os"
"@internal
Signed extended immediate value (-2G .. 2G-1).
This constraint will only match if the machine provides
the extended-immediate facility."
(and (match_code "const_int")
(match_test "s390_O_constraint_str ('s', ival)")))
(define_constraint "Op"
"@internal
Positive extended immediate value (0 .. 4G-1).
This constraint will only match if the machine provides
the extended-immediate facility."
(and (match_code "const_int")
(match_test "s390_O_constraint_str ('p', ival)")))
(define_constraint "On"
"@internal
Negative extended immediate value (-4G .. -1).
This constraint will only match if the machine provides
the extended-immediate facility."
(and (match_code "const_int")
(match_test "s390_O_constraint_str ('n', ival)")))
;;
;; Memory constraints follow.
;;
(define_memory_constraint "Q"
"Memory reference without index register and with short displacement"
(match_test "s390_mem_constraint (\"Q\", op)"))
(define_memory_constraint "R"
"Memory reference with index register and short displacement"
(match_test "s390_mem_constraint (\"R\", op)"))
(define_memory_constraint "S"
"Memory reference without index register but with long displacement"
(match_test "s390_mem_constraint (\"S\", op)"))
(define_memory_constraint "T"
"Memory reference with index register and long displacement"
(match_test "s390_mem_constraint (\"T\", op)"))
(define_memory_constraint "AQ"
"@internal
Offsettable memory reference without index register and with short displacement"
(match_test "s390_mem_constraint (\"AQ\", op)"))
(define_memory_constraint "AR"
"@internal
Offsettable memory reference with index register and short displacement"
(match_test "s390_mem_constraint (\"AR\", op)"))
(define_memory_constraint "AS"
"@internal
Offsettable memory reference without index register but with long displacement"
(match_test "s390_mem_constraint (\"AS\", op)"))
(define_memory_constraint "AT"
"@internal
Offsettable memory reference with index register and long displacement"
(match_test "s390_mem_constraint (\"AT\", op)"))
(define_constraint "BQ"
"@internal
Memory reference without index register and with short
displacement that does *not* refer to a literal pool entry."
(match_test "s390_mem_constraint (\"BQ\", op)"))
(define_constraint "BR"
"@internal
Memory reference with index register and short displacement that
does *not* refer to a literal pool entry. "
(match_test "s390_mem_constraint (\"BR\", op)"))
(define_constraint "BS"
"@internal
Memory reference without index register but with long displacement
that does *not* refer to a literal pool entry. "
(match_test "s390_mem_constraint (\"BS\", op)"))
(define_constraint "BT"
"@internal
Memory reference with index register and long displacement that
does *not* refer to a literal pool entry. "
(match_test "s390_mem_constraint (\"BT\", op)"))
(define_address_constraint "U"
"Pointer with short displacement"
(match_test "s390_mem_constraint (\"U\", op)"))
(define_address_constraint "W"
"Pointer with long displacement"
(match_test "s390_mem_constraint (\"W\", op)"))