;; Constraint definitions for RS6000 ;; Copyright (C) 2006-2020 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/.

;; Available constraint letters: e k q t u A B C D S T

;; Register constraints

(define_register_constraint “f” “rs6000_constraints[RS6000_CONSTRAINT_f]” “@internal”)

(define_register_constraint “d” “rs6000_constraints[RS6000_CONSTRAINT_d]” “@internal”)

(define_register_constraint “b” “BASE_REGS” “@internal”)

(define_register_constraint “h” “SPECIAL_REGS” “@internal”)

(define_register_constraint “c” “CTR_REGS” “@internal”)

(define_register_constraint “l” “LINK_REGS” “@internal”)

(define_register_constraint “v” “ALTIVEC_REGS” “@internal”)

(define_register_constraint “x” “CR0_REGS” “@internal”)

(define_register_constraint “y” “CR_REGS” “@internal”)

(define_register_constraint “z” “CA_REGS” “@internal”)

;; Use w as a prefix to add VSX modes ;; any VSX register (define_register_constraint “wa” “rs6000_constraints[RS6000_CONSTRAINT_wa]” “Any VSX register if the -mvsx option was used or NO_REGS.”)

;; NOTE: For compatibility, “wc” is reserved to represent individual CR bits. ;; It is currently used for that purpose in LLVM.

(define_register_constraint “we” “rs6000_constraints[RS6000_CONSTRAINT_we]” “VSX register if the -mpower9-vector -m64 options were used or NO_REGS.”)

;; NO_REGs register constraint, used to merge mov{sd,sf}, since movsd can use ;; direct move directly, and movsf can't to move between the register sets. ;; There is a mode_attr that resolves to wa for SDmode and wn for SFmode (define_register_constraint “wn” “NO_REGS” “No register (NO_REGS).”)

(define_register_constraint “wr” “rs6000_constraints[RS6000_CONSTRAINT_wr]” “General purpose register if 64-bit instructions are enabled or NO_REGS.”)

(define_register_constraint “wx” “rs6000_constraints[RS6000_CONSTRAINT_wx]” “Floating point register if the STFIWX instruction is enabled or NO_REGS.”)

(define_register_constraint “wA” “rs6000_constraints[RS6000_CONSTRAINT_wA]” “BASE_REGS if 64-bit instructions are enabled or NO_REGS.”)

;; wB needs ISA 2.07 VUPKHSW (define_constraint “wB” “Signed 5-bit constant integer that can be loaded into an altivec register.” (and (match_code “const_int”) (and (match_test “TARGET_P8_VECTOR”) (match_operand 0 “s5bit_cint_operand”))))

(define_constraint “wD” “Int constant that is the element number of the 64-bit scalar in a vector.” (and (match_code “const_int”) (match_test “TARGET_VSX && (ival == VECTOR_ELEMENT_SCALAR_64BIT)”)))

(define_constraint “wE” “Vector constant that can be loaded with the XXSPLTIB instruction.” (match_test “xxspltib_constant_nosplit (op, mode)”))

;; Extended fusion store (define_memory_constraint “wF” “Memory operand suitable for power8 GPR load fusion” (match_operand 0 “fusion_addis_mem_combo_load”))

(define_constraint “wL” “Int constant that is the element number mfvsrld accesses in a vector.” (and (match_code “const_int”) (and (match_test “TARGET_DIRECT_MOVE_128”) (match_test “(ival == VECTOR_ELEMENT_MFVSRLD_64BIT)”))))

;; Generate the XXORC instruction to set a register to all 1‘s (define_constraint “wM” "Match vector constant with all 1’s if the XXLORC instruction is available" (and (match_test “TARGET_P8_VECTOR”) (match_operand 0 “all_ones_constant”)))

;; ISA 3.0 vector d-form addresses (define_memory_constraint “wO” “Memory operand suitable for the ISA 3.0 vector d-form instructions.” (match_operand 0 “vsx_quad_dform_memory_operand”))

;; Lq/stq validates the address for load/store quad (define_memory_constraint “wQ” “Memory operand suitable for the load/store quad instructions” (match_operand 0 “quad_memory_operand”))

(define_constraint “wS” “Vector constant that can be loaded with XXSPLTIB & sign extension.” (match_test “xxspltib_constant_split (op, mode)”))

;; ISA 3.0 DS-form instruction that has the bottom 2 bits 0 and no update form. ;; Used by LXSD/STXSD/LXSSP/STXSSP. In contrast to “Y”, the multiple-of-four ;; offset is enforced for 32-bit too. (define_memory_constraint “wY” “Offsettable memory operand, with bottom 2 bits 0” (and (match_code “mem”) (not (match_test “update_address_mem (op, mode)”)) (match_test “mem_operand_ds_form (op, mode)”)))

;; Altivec style load/store that ignores the bottom bits of the address (define_memory_constraint “wZ” “Indexed or indirect memory operand, ignoring the bottom 4 bits” (match_operand 0 “altivec_indexed_or_indirect_operand”))

;; Integer constraints

(define_constraint “I” “A signed 16-bit constant” (and (match_code “const_int”) (match_test “((unsigned HOST_WIDE_INT) ival + 0x8000) < 0x10000”)))

(define_constraint “J” “high-order 16 bits nonzero” (and (match_code “const_int”) (match_test “(ival & (~ (unsigned HOST_WIDE_INT) 0xffff0000)) == 0”)))

(define_constraint “K” “low-order 16 bits nonzero” (and (match_code “const_int”) (match_test “(ival & (~ (HOST_WIDE_INT) 0xffff)) == 0”)))

(define_constraint “L” “signed 16-bit constant shifted left 16 bits” (and (match_code “const_int”) (match_test “((ival & 0xffff) == 0 && (ival >> 31 == -1 || ival >> 31 == 0))”)))

(define_constraint “M” “constant greater than 31” (and (match_code “const_int”) (match_test “ival > 31”)))

(define_constraint “N” “positive constant that is an exact power of two” (and (match_code “const_int”) (match_test “ival > 0 && exact_log2 (ival) >= 0”)))

(define_constraint “O” “constant zero” (and (match_code “const_int”) (match_test “ival == 0”)))

(define_constraint “P” “constant whose negation is signed 16-bit constant” (and (match_code “const_int”) (match_test “((- (unsigned HOST_WIDE_INT) ival) + 0x8000) < 0x10000”)))

;; 34-bit signed integer constant (define_constraint “eI” “34-bit constant integer that can be loaded with PADDI” (match_operand 0 “cint34_operand”))

;; Floating-point constraints. These two are defined so that insn ;; length attributes can be calculated exactly.

(define_constraint “G” “Constant that can be copied into GPR with two insns for DF/DD and one for SF/SD.” (and (match_code “const_double”) (match_test “num_insns_constant (op, mode) == (mode == SFmode || mode == SDmode ? 1 : 2)”)))

(define_constraint “H” “DF/DD constant that takes three insns.” (and (match_code “const_double”) (match_test “num_insns_constant (op, mode) == 3”)))

;; Memory constraints

(define_memory_constraint “es” “A ``stable'' memory operand; that is, one which does not include any automodification of the base register. Unlike @samp{m}, this constraint can be used in @code{asm} statements that might access the operand several times, or that might not access it at all.” (and (match_code “mem”) (match_test “GET_RTX_CLASS (GET_CODE (XEXP (op, 0))) != RTX_AUTOINC”)))

(define_memory_constraint “Q” “A memory operand addressed by just a base register.” (and (match_code “mem”) (match_test “REG_P (XEXP (op, 0))”)))

(define_memory_constraint “Y” “memory operand for 8 byte and 16 byte gpr load/store” (and (match_code “mem”) (match_test “mem_operand_gpr (op, mode)”)))

(define_memory_constraint “Z” “Memory operand that is an indexed or indirect from a register (it is usually better to use @samp{m} or @samp{es} in @code{asm} statements)” (match_operand 0 “indexed_or_indirect_operand”))

;; Address constraints

(define_address_constraint “a” “Indexed or indirect address operand” (match_operand 0 “indexed_or_indirect_address”))

(define_constraint “R” “AIX TOC entry” (match_test “legitimate_constant_pool_address_p (op, QImode, false)”))

;; General constraints

(define_constraint “U” “V.4 small data reference” (and (match_test “DEFAULT_ABI == ABI_V4”) (match_test “small_data_operand (op, mode)”)))

(define_constraint “W” “vector constant that does not require memory” (match_operand 0 “easy_vector_constant”))

(define_constraint “j” “Zero vector constant” (match_test “op == const0_rtx || op == CONST0_RTX (mode)”))