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|
;; Machine Descriptions for R8C/M16C/M32C
;; Copyright (C) 2005, 2007
;; Free Software Foundation, Inc.
;; Contributed by Red Hat.
;;
;; 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/>.
; conditionals - cmp, jcc, setcc, etc.
; Special note about conditional instructions: GCC always emits the
; compare right before the insn, which is good, because m32c's mov
; insns modify the flags. However, this means that any conditional
; insn that may require reloading must be kept with its compare until
; after reload finishes, else the reload insns might clobber the
; flags. Thus, these rules:
;
; * the cmp* expanders just save the operands in compare_op0 and
; compare_op1 via m32c_pend_compare.
; * conditional insns that won't need reload can call
; m32c_unpend_compare before their expansion.
; * other insns must expand to include the compare operands within,
; then split after reload to a separate compare and conditional.
; Until support for relaxing is supported in gas, we must assume that
; short labels won't reach, so we must use long labels.
; Unfortunately, there aren't any conditional jumps with long labels,
; so instead we invert the conditional and jump around a regular jump.
; Note that we can, at some point in the future, add code to omit the
; "cmp" portion of the insn if the preceding insn happened to set the
; right flags already. For example, a mov followed by a "cmp *,0" is
; redundant; the move already set the Z flag.
(define_insn_and_split "cbranch<mode>4"
[(set (pc) (if_then_else
(match_operator 0 "m32c_cmp_operator"
[(match_operand:QHPSI 1 "mra_operand" "RraSd")
(match_operand:QHPSI 2 "mrai_operand" "iRraSd")])
(label_ref (match_operand 3 "" ""))
(pc)))]
""
"#"
"reload_completed"
[(set (reg:CC FLG_REGNO)
(compare (match_dup 1)
(match_dup 2)))
(set (pc) (if_then_else (match_dup 4)
(label_ref (match_dup 3))
(pc)))]
"operands[4] = m32c_cmp_flg_0 (operands[0]);"
)
(define_insn "stzx_16"
[(set (match_operand:QI 0 "mrai_operand" "=R0w,R0w,R0w")
(if_then_else:QI (eq (reg:CC FLG_REGNO) (const_int 0))
(match_operand:QI 1 "const_int_operand" "i,i,0")
(match_operand:QI 2 "const_int_operand" "i,0,i")))]
"TARGET_A16 && reload_completed"
"@
stzx\t%1,%2,%0
stz\t%1,%0
stnz\t%2,%0"
[(set_attr "flags" "n,n,n")]
)
(define_insn "stzx_24_<mode>"
[(set (match_operand:QHI 0 "mrai_operand" "=RraSd,RraSd,RraSd")
(if_then_else:QHI (eq (reg:CC FLG_REGNO) (const_int 0))
(match_operand:QHI 1 "const_int_operand" "i,i,0")
(match_operand:QHI 2 "const_int_operand" "i,0,i")))]
"TARGET_A24 && reload_completed"
"@
stzx.<bwl>\t%1,%2,%0
stz.<bwl>\t%1,%0
stnz.<bwl>\t%2,%0"
[(set_attr "flags" "n,n,n")])
(define_insn_and_split "stzx_reversed_<mode>"
[(set (match_operand:QHI 0 "m32c_r0_operand" "=R0w")
(if_then_else:QHI (ne (reg:CC FLG_REGNO) (const_int 0))
(match_operand:QHI 1 "const_int_operand" "")
(match_operand:QHI 2 "const_int_operand" "")))]
"(TARGET_A24 || GET_MODE (operands[0]) == QImode) && reload_completed"
"#"
""
[(set (match_dup 0)
(if_then_else:QHI (eq (reg:CC FLG_REGNO) (const_int 0))
(match_dup 2)
(match_dup 1)))]
""
)
(define_insn "cmp<mode>_op"
[(set (reg:CC FLG_REGNO)
(compare (match_operand:QHPSI 0 "mra_operand" "RraSd")
(match_operand:QHPSI 1 "mrai_operand" "RraSdi")))]
""
"* return m32c_output_compare(insn, operands); "
[(set_attr "flags" "oszc")])
(define_expand "cmp<mode>"
[(set (reg:CC FLG_REGNO)
(compare (match_operand:QHPSI 0 "mra_operand" "RraSd")
(match_operand:QHPSI 1 "mrai_operand" "RraSdi")))]
""
"m32c_pend_compare (operands); DONE;")
(define_insn "b<code>_op"
[(set (pc)
(if_then_else (any_cond (reg:CC FLG_REGNO)
(const_int 0))
(label_ref (match_operand 0 ""))
(pc)))]
""
"j<code>\t%l0"
[(set_attr "flags" "n")]
)
(define_expand "b<code>"
[(set (pc)
(if_then_else (any_cond (reg:CC FLG_REGNO)
(const_int 0))
(label_ref (match_operand 0 ""))
(pc)))]
""
"m32c_unpend_compare ();"
)
;; m32c_conditional_register_usage changes the setcc_gen_code array to
;; point to the _24 variants if needed.
;; We need to keep the compare and conditional sets together through
;; reload, because reload might need to add address reloads to the
;; set, which would clobber the flags. By keeping them together, the
;; reloads get put before the compare, thus preserving the flags.
;; These are the post-split patterns for the conditional sets.
(define_insn "s<code>_op"
[(set (match_operand:QI 0 "register_operand" "=Rqi")
(any_cond:QI (reg:CC FLG_REGNO) (const_int 0)))]
"TARGET_A16 && reload_completed"
"* return m32c_scc_pattern(operands, <CODE>);")
(define_insn "s<code>_24_op"
[(set (match_operand:HI 0 "mra_operand" "=RhiSd")
(any_cond:HI (reg:CC FLG_REGNO) (const_int 0)))]
"TARGET_A24 && reload_completed"
"sc<code>\t%0"
[(set_attr "flags" "n")]
)
;; These are the pre-split patterns for the conditional sets. Yes,
;; there are a lot of permutations.
(define_insn_and_split "s<code>_<mode>"
[(set (match_operand:QI 0 "register_operand" "=Rqi")
(any_cond:QI (match_operand:QHPSI 1 "mra_operand" "RraSd")
(match_operand:QHPSI 2 "mrai_operand" "RraSdi")))]
"TARGET_A16"
"#"
"reload_completed"
[(set (reg:CC FLG_REGNO)
(compare (match_dup 1)
(match_dup 2)))
(set (match_dup 0)
(any_cond:QI (reg:CC FLG_REGNO) (const_int 0)))]
""
[(set_attr "flags" "x")]
)
(define_insn_and_split "s<code>_<mode>_24"
[(set (match_operand:HI 0 "mra_nopp_operand" "=RhiSd")
(any_cond:HI (match_operand:QHPSI 1 "mra_operand" "RraSd")
(match_operand:QHPSI 2 "mrai_operand" "RraSdi")))]
"TARGET_A24"
"#"
"reload_completed"
[(set (reg:CC FLG_REGNO)
(compare (match_dup 1)
(match_dup 2)))
(set (match_dup 0)
(any_cond:HI (reg:CC FLG_REGNO) (const_int 0)))]
""
[(set_attr "flags" "x")]
)
(define_insn_and_split "movqicc_<code>_<mode>"
[(set (match_operand:QI 0 "register_operand" "=R0w")
(if_then_else:QI (eqne_cond:QI (match_operand:QHPSI 1 "mra_operand" "RraSd")
(match_operand:QHPSI 2 "mrai_operand" "RraSdi"))
(match_operand:QI 3 "const_int_operand" "")
(match_operand:QI 4 "const_int_operand" "")))]
""
"#"
"reload_completed"
[(set (reg:CC FLG_REGNO)
(compare (match_dup 1)
(match_dup 2)))
(set (match_dup 0)
(if_then_else:QI (eqne_cond:QI (reg:CC FLG_REGNO) (const_int 0))
(match_dup 3)
(match_dup 4)))]
""
[(set_attr "flags" "x")]
)
(define_insn_and_split "movhicc_<code>_<mode>"
[(set (match_operand:HI 0 "register_operand" "=R0w")
(if_then_else:HI (eqne_cond:HI (match_operand:QHPSI 1 "mra_operand" "RraSd")
(match_operand:QHPSI 2 "mrai_operand" "RraSdi"))
(match_operand:QI 3 "const_int_operand" "")
(match_operand:QI 4 "const_int_operand" "")))]
"TARGET_A24"
"#"
"reload_completed"
[(set (reg:CC FLG_REGNO)
(compare (match_dup 1)
(match_dup 2)))
(set (match_dup 0)
(if_then_else:HI (eqne_cond:HI (reg:CC FLG_REGNO) (const_int 0))
(match_dup 3)
(match_dup 4)))]
""
[(set_attr "flags" "x")]
)
;; And these are the expanders, which read the pending compare
;; operands to build a combined insn.
(define_expand "s<code>"
[(set (match_operand:QI 0 "register_operand" "=Rqi")
(any_cond:QI (reg:CC FLG_REGNO) (const_int 0)))]
"TARGET_A16"
"m32c_expand_scc (<CODE>, operands); DONE;")
(define_expand "s<code>_24"
[(set (match_operand:HI 0 "mra_nopp_operand" "=RhiSd")
(any_cond:HI (reg:CC FLG_REGNO) (const_int 0)))]
"TARGET_A24"
"m32c_expand_scc (<CODE>, operands); DONE;")
(define_expand "movqicc"
[(set (match_operand:QI 0 "register_operand" "")
(if_then_else:QI (match_operand 1 "m32c_eqne_operator" "")
(match_operand:QI 2 "const_int_operand" "")
(match_operand:QI 3 "const_int_operand" "")))]
""
"if (m32c_expand_movcc(operands))
FAIL;
DONE;"
)
(define_expand "movhicc"
[(set (match_operand:HI 0 "mra_operand" "")
(if_then_else:HI (match_operand 1 "m32c_eqne_operator" "")
(match_operand:HI 2 "const_int_operand" "")
(match_operand:HI 3 "const_int_operand" "")))]
"TARGET_A24"
"if (m32c_expand_movcc(operands))
FAIL;
DONE;"
)
;; CMP opcodes subtract two values, set the flags, and discard the
;; value. This pattern recovers the sign of the discarded value based
;; on the flags. Operand 0 is set to -1, 0, or 1. This is used for
;; the cmpstr pattern. For optimal code, this should be removed if
;; followed by a suitable CMP insn (see the peephole following). This
;; pattern is 7 bytes and 5 cycles. If you don't need specific
;; values, a 5/4 pattern can be made with SCGT and BMLT to set the
;; appropriate bits.
(define_insn "cond_to_int"
[(set (match_operand:HI 0 "mra_qi_operand" "=Rqi")
(if_then_else:HI (lt (reg:CC FLG_REGNO) (const_int 0))
(const_int -1)
(if_then_else:HI (eq (reg:CC FLG_REGNO) (const_int 0))
(const_int 0)
(const_int -1))))]
"TARGET_A24"
"sceq\t%0\n\tbmgt\t1,%h0\n\tdec.w\t%0"
[(set_attr "flags" "x")]
)
;; A cond_to_int followed by a compare against zero is essentially a
;; no-op. However, the result of the cond_to_int may be used by later
;; insns, so make sure it's dead before deleting its set.
(define_peephole2
[(set (match_operand:HI 0 "mra_qi_operand" "")
(if_then_else:HI (lt (reg:CC FLG_REGNO) (const_int 0))
(const_int -1)
(if_then_else:HI (eq (reg:CC FLG_REGNO) (const_int 0))
(const_int 0)
(const_int -1))))
(set (reg:CC FLG_REGNO)
(compare (match_operand:HI 1 "mra_qi_operand" "")
(const_int 0)))
]
"rtx_equal_p (operands[0], operands[1])
&& dead_or_set_p (peep2_next_insn (1), operands[0])"
[(const_int 1)]
"")
|
