Subversion Repositories hf-risc

;; Machine description for RISC-V atomic operations.
;; Copyright (C) 2011-2014 Free Software Foundation, Inc.
;; Contributed by Andrew Waterman (waterman@cs.berkeley.edu) at UC Berkeley.
;; Based on MIPS target for GNU compiler.

;; 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/>.

(define_c_enum "unspec" [
  UNSPEC_COMPARE_AND_SWAP
  UNSPEC_SYNC_OLD_OP
  UNSPEC_SYNC_EXCHANGE
  UNSPEC_ATOMIC_STORE
  UNSPEC_MEMORY_BARRIER
])

(define_code_iterator any_atomic [plus ior xor and])
(define_code_attr atomic_optab
  [(plus "add") (ior "or") (xor "xor") (and "and")])

;; Memory barriers.

(define_expand "mem_thread_fence"
  [(match_operand:SI 0 "const_int_operand" "")] ;; model
  ""
{
  if (INTVAL (operands[0]) != MEMMODEL_RELAXED)
    {
      rtx mem = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode));
      MEM_VOLATILE_P (mem) = 1;
      emit_insn (gen_mem_thread_fence_1 (mem, operands[0]));
    }
  DONE;
})

(define_insn "mem_thread_fence_1"
  [(set (match_operand:BLK 0 "" "")
        (unspec:BLK [(match_dup 0)] UNSPEC_MEMORY_BARRIER))
   (match_operand:SI 1 "const_int_operand" "")] ;; model
  ""
{
  switch (INTVAL (operands[1]))
    {
    case MEMMODEL_SEQ_CST:
    case MEMMODEL_ACQ_REL:
      return "fence rw,rw";
    case MEMMODEL_ACQUIRE:
    case MEMMODEL_CONSUME:
      return "fence r,rw";
    case MEMMODEL_RELEASE:
      return "fence rw,w";
    default:
      gcc_unreachable();
    }
})

;; Atomic memory operations.

;; Implement atomic stores with amoswap.  Fall back to fences for atomic loads.
(define_insn "atomic_store<mode>"
  [(set (match_operand:GPR 0 "memory_operand" "=A")
    (unspec_volatile:GPR
      [(match_operand:GPR 1 "reg_or_0_operand" "rJ")
       (match_operand:SI 2 "const_int_operand")]      ;; model
      UNSPEC_ATOMIC_STORE))]
  "TARGET_ATOMIC"
  "amoswap.<amo>%A2 zero,%z1,%0")

(define_insn "atomic_<atomic_optab><mode>"
  [(set (match_operand:GPR 0 "memory_operand" "+A")
        (unspec_volatile:GPR
          [(any_atomic:GPR (match_dup 0)
                     (match_operand:GPR 1 "reg_or_0_operand" "rJ"))
           (match_operand:SI 2 "const_int_operand")] ;; model
         UNSPEC_SYNC_OLD_OP))]
  "TARGET_ATOMIC"
  "amo<insn>.<amo>%A2 zero,%z1,%0")

(define_insn "atomic_fetch_<atomic_optab><mode>"
  [(set (match_operand:GPR 0 "register_operand" "=&r")
        (match_operand:GPR 1 "memory_operand" "+A"))
   (set (match_dup 1)
        (unspec_volatile:GPR
          [(any_atomic:GPR (match_dup 1)
                     (match_operand:GPR 2 "reg_or_0_operand" "rJ"))
           (match_operand:SI 3 "const_int_operand")] ;; model
         UNSPEC_SYNC_OLD_OP))]
  "TARGET_ATOMIC"
  "amo<insn>.<amo>%A3 %0,%z2,%1")

(define_insn "atomic_exchange<mode>"
  [(set (match_operand:GPR 0 "register_operand" "=&r")
        (unspec_volatile:GPR
          [(match_operand:GPR 1 "memory_operand" "+A")
           (match_operand:SI 3 "const_int_operand")] ;; model
          UNSPEC_SYNC_EXCHANGE))
   (set (match_dup 1)
        (match_operand:GPR 2 "register_operand" "0"))]
  "TARGET_ATOMIC"
  "amoswap.<amo>%A3 %0,%z2,%1")

(define_insn "atomic_cas_value_strong<mode>"
  [(set (match_operand:GPR 0 "register_operand" "=&r")
        (match_operand:GPR 1 "memory_operand" "+A"))
   (set (match_dup 1)
        (unspec_volatile:GPR [(match_operand:GPR 2 "reg_or_0_operand" "rJ")
                              (match_operand:GPR 3 "reg_or_0_operand" "rJ")
                              (match_operand:SI 4 "const_int_operand")  ;; mod_s
                              (match_operand:SI 5 "const_int_operand")] ;; mod_f
         UNSPEC_COMPARE_AND_SWAP))
   (clobber (match_scratch:GPR 6 "=&r"))]
  "TARGET_ATOMIC"
  "1: lr.<amo>%A5 %0,%1; bne %0,%z2,1f; sc.<amo>%A4 %6,%z3,%1; bnez %6,1b; 1:"
  [(set (attr "length") (const_int 16))])

(define_expand "atomic_compare_and_swap<mode>"
  [(match_operand:SI 0 "register_operand" "")   ;; bool output
   (match_operand:GPR 1 "register_operand" "")  ;; val output
   (match_operand:GPR 2 "memory_operand" "")    ;; memory
   (match_operand:GPR 3 "reg_or_0_operand" "")  ;; expected value
   (match_operand:GPR 4 "reg_or_0_operand" "")  ;; desired value
   (match_operand:SI 5 "const_int_operand" "")  ;; is_weak
   (match_operand:SI 6 "const_int_operand" "")  ;; mod_s
   (match_operand:SI 7 "const_int_operand" "")] ;; mod_f
  "TARGET_ATOMIC"
{
  emit_insn (gen_atomic_cas_value_strong<mode> (operands[1], operands[2],
                                                operands[3], operands[4],
                                                operands[6], operands[7]));

  rtx compare = operands[1];
  if (operands[3] != const0_rtx)
    {
      rtx difference = gen_rtx_MINUS (<MODE>mode, operands[1], operands[3]);
      compare = gen_reg_rtx (<MODE>mode);
      emit_insn (gen_rtx_SET (VOIDmode, compare, difference));
    }

  rtx eq = gen_rtx_EQ (<MODE>mode, compare, const0_rtx);
  rtx result = gen_reg_rtx (<MODE>mode);
  emit_insn (gen_rtx_SET (VOIDmode, result, eq));
  emit_insn (gen_rtx_SET (VOIDmode, operands[0], gen_lowpart (SImode, result)));
  DONE;
})

(define_expand "atomic_test_and_set"
  [(match_operand:QI 0 "register_operand" "")     ;; bool output
   (match_operand:QI 1 "memory_operand" "+A")    ;; memory
   (match_operand:SI 2 "const_int_operand" "")]   ;; model
  "TARGET_ATOMIC"
{
  /* We have no QImode atomics, so use the address LSBs to form a mask,
     then use an aligned SImode atomic. */
  rtx result = operands[0];
  rtx mem = operands[1];
  rtx model = operands[2];
  rtx addr = force_reg (Pmode, XEXP (mem, 0));

  rtx aligned_addr = gen_reg_rtx (Pmode);
  emit_move_insn (aligned_addr, gen_rtx_AND (Pmode, addr, GEN_INT (-4)));

  rtx aligned_mem = change_address (mem, SImode, aligned_addr);
  set_mem_alias_set (aligned_mem, 0);

  rtx offset = gen_reg_rtx (SImode);
  emit_move_insn (offset, gen_rtx_AND (SImode, gen_lowpart (SImode, addr),
                                       GEN_INT (3)));

  rtx tmp = gen_reg_rtx (SImode);
  emit_move_insn (tmp, GEN_INT (1));

  rtx shmt = gen_reg_rtx (SImode);
  emit_move_insn (shmt, gen_rtx_ASHIFT (SImode, offset, GEN_INT (3)));

  rtx word = gen_reg_rtx (SImode);
  emit_move_insn (word, gen_rtx_ASHIFT (SImode, tmp, shmt));

  tmp = gen_reg_rtx (SImode);
  emit_insn (gen_atomic_fetch_orsi (tmp, aligned_mem, word, model));

  emit_move_insn (gen_lowpart (SImode, result),
                  gen_rtx_LSHIFTRT (SImode, tmp,
                                    gen_lowpart (SImode, shmt)));
  DONE;
})