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* config/h8300/h8300.md (a peephole2): New.

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Kazu Hirata 2003-02-12 23:32:21 +00:00 committed by Kazu Hirata
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gcc/ChangeLog
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@ -1,3 +1,7 @@
2003-02-12 Kazu Hirata <kazu@cs.umass.edu>
* config/h8300/h8300.md (a peephole2): New.
Wed Feb 12 22:47:18 CET 2003 Jan Hubicka <jh@suse.cz>
* Makefile.in (CRTSTUFF_CFLAGS): Add -fno-unit-at-a-time

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gcc/config/h8300/h8300.md
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@ -3561,6 +3561,36 @@
gen_rtx_NE (VOIDmode, cc0_rtx, const0_rtx) :
gen_rtx_EQ (VOIDmode, cc0_rtx, const0_rtx));")
;; For constants like -1, -2, 1, 2, it is still cheaper to make a copy
;; of the register being tested, do the subtraction on the copy, and
;; then test the copy. We avoid this transformation if we see more
;; than one copy of the same compare insn.
(define_peephole2
[(match_scratch:SI 4 "r")
(set (cc0)
(compare:SI (match_operand:SI 0 "register_operand" "")
(match_operand:SI 1 "incdec_operand" "")))
(set (pc)
(if_then_else (match_operator 3 "eqne_operator"
[(cc0) (const_int 0)])
(label_ref (match_operand 2 "" ""))
(pc)))]
"(TARGET_H8300H || TARGET_H8300S)
&& !peep2_reg_dead_p (1, operands[0])
&& !rtx_equal_p (PATTERN (insn),
PATTERN (next_nonnote_insn (next_nonnote_insn (insn))))"
[(set (cc0)
(match_dup 0))
(set (pc)
(if_then_else (match_op_dup 3 [(cc0) (const_int 0)])
(label_ref (match_dup 2))
(pc)))]
"emit_move_insn (operands[4], operands[0]);
operands[0] = operands[4];
operands[1] = GEN_INT (- INTVAL (operands[1]));
split_adds_subs (SImode, operands, 1);")
;; Narrow the mode of testing if possible.
(define_peephole2