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+;; Constraint definitions for ARM and Thumb
+;; Copyright (C) 2006, 2007, 2008, 2010 Free Software Foundation, Inc.
+;; Contributed by ARM Ltd.
+
+;; 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/>.
+
+;; The following register constraints have been used:
+;; - in ARM/Thumb-2 state: f, t, v, w, x, y, z
+;; - in Thumb state: h, b
+;; - in both states: l, c, k
+;; In ARM state, 'l' is an alias for 'r'
+
+;; The following normal constraints have been used:
+;; in ARM/Thumb-2 state: G, H, I, j, J, K, L, M
+;; in Thumb-1 state: I, J, K, L, M, N, O
+
+;; The following multi-letter normal constraints have been used:
+;; in ARM/Thumb-2 state: Da, Db, Dc, Dn, Dl, DL, Dv, Dy, Di, Dz
+;; in Thumb-1 state: Pa, Pb, Pc, Pd
+;; in Thumb-2 state: Ps, Pt, Pu, Pv, Pw, Px
+
+;; The following memory constraints have been used:
+;; in ARM/Thumb-2 state: Q, Ut, Uv, Uy, Un, Um, Us
+;; in ARM state: Uq
+
+
+(define_register_constraint "f" "TARGET_ARM ? FPA_REGS : NO_REGS"
+ "Legacy FPA registers @code{f0}-@code{f7}.")
+
+(define_register_constraint "t" "TARGET_32BIT ? VFP_LO_REGS : NO_REGS"
+ "The VFP registers @code{s0}-@code{s31}.")
+
+(define_register_constraint "v" "TARGET_ARM ? CIRRUS_REGS : NO_REGS"
+ "The Cirrus Maverick co-processor registers.")
+
+(define_register_constraint "w"
+ "TARGET_32BIT ? (TARGET_VFPD32 ? VFP_REGS : VFP_LO_REGS) : NO_REGS"
+ "The VFP registers @code{d0}-@code{d15}, or @code{d0}-@code{d31} for VFPv3.")
+
+(define_register_constraint "x" "TARGET_32BIT ? VFP_D0_D7_REGS : NO_REGS"
+ "The VFP registers @code{d0}-@code{d7}.")
+
+(define_register_constraint "y" "TARGET_REALLY_IWMMXT ? IWMMXT_REGS : NO_REGS"
+ "The Intel iWMMX co-processor registers.")
+
+(define_register_constraint "z"
+ "TARGET_REALLY_IWMMXT ? IWMMXT_GR_REGS : NO_REGS"
+ "The Intel iWMMX GR registers.")
+
+(define_register_constraint "l" "TARGET_THUMB ? LO_REGS : GENERAL_REGS"
+ "In Thumb state the core registers @code{r0}-@code{r7}.")
+
+(define_register_constraint "h" "TARGET_THUMB ? HI_REGS : NO_REGS"
+ "In Thumb state the core registers @code{r8}-@code{r15}.")
+
+(define_constraint "j"
+ "A constant suitable for a MOVW instruction. (ARM/Thumb-2)"
+ (and (match_test "TARGET_32BIT && arm_arch_thumb2")
+ (ior (match_code "high")
+ (and (match_code "const_int")
+ (match_test "(ival & 0xffff0000) == 0")))))
+
+(define_register_constraint "k" "STACK_REG"
+ "@internal The stack register.")
+
+(define_register_constraint "b" "TARGET_THUMB ? BASE_REGS : NO_REGS"
+ "@internal
+ Thumb only. The union of the low registers and the stack register.")
+
+(define_register_constraint "c" "CC_REG"
+ "@internal The condition code register.")
+
+(define_constraint "I"
+ "In ARM/Thumb-2 state a constant that can be used as an immediate value in a
+ Data Processing instruction. In Thumb-1 state a constant in the range
+ 0-255."
+ (and (match_code "const_int")
+ (match_test "TARGET_32BIT ? const_ok_for_arm (ival)
+ : ival >= 0 && ival <= 255")))
+
+(define_constraint "J"
+ "In ARM/Thumb-2 state a constant in the range @minus{}4095-4095. In Thumb-1
+ state a constant in the range @minus{}255-@minus{}1."
+ (and (match_code "const_int")
+ (match_test "TARGET_32BIT ? (ival >= -4095 && ival <= 4095)
+ : (ival >= -255 && ival <= -1)")))
+
+(define_constraint "K"
+ "In ARM/Thumb-2 state a constant that satisfies the @code{I} constraint if
+ inverted. In Thumb-1 state a constant that satisfies the @code{I}
+ constraint multiplied by any power of 2."
+ (and (match_code "const_int")
+ (match_test "TARGET_32BIT ? const_ok_for_arm (~ival)
+ : thumb_shiftable_const (ival)")))
+
+(define_constraint "L"
+ "In ARM/Thumb-2 state a constant that satisfies the @code{I} constraint if
+ negated. In Thumb-1 state a constant in the range @minus{}7-7."
+ (and (match_code "const_int")
+ (match_test "TARGET_32BIT ? const_ok_for_arm (-ival)
+ : (ival >= -7 && ival <= 7)")))
+
+;; The ARM state version is internal...
+;; @internal In ARM/Thumb-2 state a constant in the range 0-32 or any
+;; power of 2.
+(define_constraint "M"
+ "In Thumb-1 state a constant that is a multiple of 4 in the range 0-1020."
+ (and (match_code "const_int")
+ (match_test "TARGET_32BIT ? ((ival >= 0 && ival <= 32)
+ || (((ival & (ival - 1)) & 0xFFFFFFFF) == 0))
+ : ival >= 0 && ival <= 1020 && (ival & 3) == 0")))
+
+(define_constraint "N"
+ "Thumb-1 state a constant in the range 0-31."
+ (and (match_code "const_int")
+ (match_test "!TARGET_32BIT && (ival >= 0 && ival <= 31)")))
+
+(define_constraint "O"
+ "In Thumb-1 state a constant that is a multiple of 4 in the range
+ @minus{}508-508."
+ (and (match_code "const_int")
+ (match_test "TARGET_THUMB1 && ival >= -508 && ival <= 508
+ && ((ival & 3) == 0)")))
+
+(define_constraint "Pa"
+ "@internal In Thumb-1 state a constant in the range -510 to +510"
+ (and (match_code "const_int")
+ (match_test "TARGET_THUMB1 && ival >= -510 && ival <= 510
+ && (ival > 255 || ival < -255)")))
+
+(define_constraint "Pb"
+ "@internal In Thumb-1 state a constant in the range -262 to +262"
+ (and (match_code "const_int")
+ (match_test "TARGET_THUMB1 && ival >= -262 && ival <= 262
+ && (ival > 255 || ival < -255)")))
+
+(define_constraint "Pc"
+ "@internal In Thumb-1 state a constant that is in the range 1021 to 1275"
+ (and (match_code "const_int")
+ (match_test "TARGET_THUMB1
+ && ival > 1020 && ival <= 1275")))
+
+(define_constraint "Pd"
+ "@internal In Thumb-1 state a constant in the range 0 to 7"
+ (and (match_code "const_int")
+ (match_test "TARGET_THUMB1 && ival >= 0 && ival <= 7")))
+
+(define_constraint "Ps"
+ "@internal In Thumb-2 state a constant in the range -255 to +255"
+ (and (match_code "const_int")
+ (match_test "TARGET_THUMB2 && ival >= -255 && ival <= 255")))
+
+(define_constraint "Pt"
+ "@internal In Thumb-2 state a constant in the range -7 to +7"
+ (and (match_code "const_int")
+ (match_test "TARGET_THUMB2 && ival >= -7 && ival <= 7")))
+
+(define_constraint "Pu"
+ "@internal In Thumb-2 state a constant in the range +1 to +8"
+ (and (match_code "const_int")
+ (match_test "TARGET_THUMB2 && ival >= 1 && ival <= 8")))
+
+(define_constraint "Pv"
+ "@internal In Thumb-2 state a constant in the range -255 to 0"
+ (and (match_code "const_int")
+ (match_test "TARGET_THUMB2 && ival >= -255 && ival <= 0")))
+
+(define_constraint "Pw"
+ "@internal In Thumb-2 state a constant in the range -255 to -1"
+ (and (match_code "const_int")
+ (match_test "TARGET_THUMB2 && ival >= -255 && ival <= -1")))
+
+(define_constraint "Px"
+ "@internal In Thumb-2 state a constant in the range -7 to -1"
+ (and (match_code "const_int")
+ (match_test "TARGET_THUMB2 && ival >= -7 && ival <= -1")))
+
+(define_constraint "G"
+ "In ARM/Thumb-2 state a valid FPA immediate constant."
+ (and (match_code "const_double")
+ (match_test "TARGET_32BIT && arm_const_double_rtx (op)")))
+
+(define_constraint "H"
+ "In ARM/Thumb-2 state a valid FPA immediate constant when negated."
+ (and (match_code "const_double")
+ (match_test "TARGET_32BIT && neg_const_double_rtx_ok_for_fpa (op)")))
+
+(define_constraint "Dz"
+ "@internal
+ In ARM/Thumb-2 state a vector of constant zeros."
+ (and (match_code "const_vector")
+ (match_test "TARGET_NEON && op == CONST0_RTX (mode)")))
+
+(define_constraint "Da"
+ "@internal
+ In ARM/Thumb-2 state a const_int, const_double or const_vector that can
+ be generated with two Data Processing insns."
+ (and (match_code "const_double,const_int,const_vector")
+ (match_test "TARGET_32BIT && arm_const_double_inline_cost (op) == 2")))
+
+(define_constraint "Db"
+ "@internal
+ In ARM/Thumb-2 state a const_int, const_double or const_vector that can
+ be generated with three Data Processing insns."
+ (and (match_code "const_double,const_int,const_vector")
+ (match_test "TARGET_32BIT && arm_const_double_inline_cost (op) == 3")))
+
+(define_constraint "Dc"
+ "@internal
+ In ARM/Thumb-2 state a const_int, const_double or const_vector that can
+ be generated with four Data Processing insns. This pattern is disabled
+ if optimizing for space or when we have load-delay slots to fill."
+ (and (match_code "const_double,const_int,const_vector")
+ (match_test "TARGET_32BIT && arm_const_double_inline_cost (op) == 4
+ && !(optimize_size || arm_ld_sched)")))
+
+(define_constraint "Di"
+ "@internal
+ In ARM/Thumb-2 state a const_int or const_double where both the high
+ and low SImode words can be generated as immediates in 32-bit instructions."
+ (and (match_code "const_double,const_int")
+ (match_test "TARGET_32BIT && arm_const_double_by_immediates (op)")))
+
+(define_constraint "Dn"
+ "@internal
+ In ARM/Thumb-2 state a const_vector which can be loaded with a Neon vmov
+ immediate instruction."
+ (and (match_code "const_vector")
+ (match_test "TARGET_32BIT
+ && imm_for_neon_mov_operand (op, GET_MODE (op))")))
+
+(define_constraint "Dl"
+ "@internal
+ In ARM/Thumb-2 state a const_vector which can be used with a Neon vorr or
+ vbic instruction."
+ (and (match_code "const_vector")
+ (match_test "TARGET_32BIT
+ && imm_for_neon_logic_operand (op, GET_MODE (op))")))
+
+(define_constraint "DL"
+ "@internal
+ In ARM/Thumb-2 state a const_vector which can be used with a Neon vorn or
+ vand instruction."
+ (and (match_code "const_vector")
+ (match_test "TARGET_32BIT
+ && imm_for_neon_inv_logic_operand (op, GET_MODE (op))")))
+
+(define_constraint "Dv"
+ "@internal
+ In ARM/Thumb-2 state a const_double which can be used with a VFP fconsts
+ instruction."
+ (and (match_code "const_double")
+ (match_test "TARGET_32BIT && vfp3_const_double_rtx (op)")))
+
+(define_constraint "Dy"
+ "@internal
+ In ARM/Thumb-2 state a const_double which can be used with a VFP fconstd
+ instruction."
+ (and (match_code "const_double")
+ (match_test "TARGET_32BIT && TARGET_VFP_DOUBLE && vfp3_const_double_rtx (op)")))
+
+(define_memory_constraint "Ut"
+ "@internal
+ In ARM/Thumb-2 state an address valid for loading/storing opaque structure
+ types wider than TImode."
+ (and (match_code "mem")
+ (match_test "TARGET_32BIT && neon_struct_mem_operand (op)")))
+
+(define_memory_constraint "Uv"
+ "@internal
+ In ARM/Thumb-2 state a valid VFP load/store address."
+ (and (match_code "mem")
+ (match_test "TARGET_32BIT && arm_coproc_mem_operand (op, FALSE)")))
+
+(define_memory_constraint "Uy"
+ "@internal
+ In ARM/Thumb-2 state a valid iWMMX load/store address."
+ (and (match_code "mem")
+ (match_test "TARGET_32BIT && arm_coproc_mem_operand (op, TRUE)")))
+
+(define_memory_constraint "Un"
+ "@internal
+ In ARM/Thumb-2 state a valid address for Neon doubleword vector
+ load/store instructions."
+ (and (match_code "mem")
+ (match_test "TARGET_32BIT && neon_vector_mem_operand (op, 0)")))
+
+(define_memory_constraint "Um"
+ "@internal
+ In ARM/Thumb-2 state a valid address for Neon element and structure
+ load/store instructions."
+ (and (match_code "mem")
+ (match_test "TARGET_32BIT && neon_vector_mem_operand (op, 2)")))
+
+(define_memory_constraint "Us"
+ "@internal
+ In ARM/Thumb-2 state a valid address for non-offset loads/stores of
+ quad-word values in four ARM registers."
+ (and (match_code "mem")
+ (match_test "TARGET_32BIT && neon_vector_mem_operand (op, 1)")))
+
+(define_memory_constraint "Uq"
+ "@internal
+ In ARM state an address valid in ldrsb instructions."
+ (and (match_code "mem")
+ (match_test "TARGET_ARM
+ && arm_legitimate_address_outer_p (GET_MODE (op), XEXP (op, 0),
+ SIGN_EXTEND, 0)")))
+
+(define_memory_constraint "Q"
+ "@internal
+ In ARM/Thumb-2 state an address that is a single base register."
+ (and (match_code "mem")
+ (match_test "REG_P (XEXP (op, 0))")))
+
+;; We used to have constraint letters for S and R in ARM state, but
+;; all uses of these now appear to have been removed.
+
+;; Additionally, we used to have a Q constraint in Thumb state, but
+;; this wasn't really a valid memory constraint. Again, all uses of
+;; this now seem to have been removed.
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