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

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From-SVN: r65082
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Kazu Hirata 2003-03-31 10:18:29 +00:00 committed by Kazu Hirata
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gcc/ChangeLog
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@ -1,3 +1,7 @@
2003-03-31 Kazu Hirata <kazu@cs.umass.edu>
* config/h8300/h8300.md (a new peephole2): New.
2003-03-31 Richard Sandiford <rsandifo@redhat.com>
* gcse.c (simple_mem): Return false for floating-point accesses

44
gcc/config/h8300/h8300.md
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@ -3955,6 +3955,50 @@
"operands[3] = gen_lowpart (HImode, operands[0]);
operands[4] = gen_lowpart (HImode, operands[1]);")
;; (compare (reg:HI) (const_int)) takes 4 bytes, so we try to achieve
;; the equivalent with shorter sequences. Here is the summary. Cases
;; are grouped for each define_peephole2.
;;
;; reg const_int use insn
;; --------------------------------------------------------
;; dead -2 eq/ne inc.l
;; dead -1 eq/ne inc.l
;; dead 1 eq/ne dec.l
;; dead 2 eq/ne dec.l
;;
;; dead 1 geu/ltu shlr.l
;; dead 3 (H8S) geu/ltu shlr.l
;;
;; dead 255 geu/ltu mov.b
(define_peephole2
[(set (cc0)
(compare (match_operand:HI 0 "register_operand" "")
(match_operand:HI 1 "const_int_operand" "")))
(set (pc)
(if_then_else (match_operator 2 "gtuleu_operator"
[(cc0) (const_int 0)])
(label_ref (match_operand 3 "" ""))
(pc)))]
"(TARGET_H8300H || TARGET_H8300S)
&& peep2_reg_dead_p (1, operands[0])
&& (INTVAL (operands[1]) == 1
|| (TARGET_H8300S && INTVAL (operands[1]) == 3))"
[(parallel [(set (match_dup 0)
(lshiftrt:HI (match_dup 0)
(match_dup 5)))
(clobber (scratch:QI))])
(set (cc0)
(match_dup 0))
(set (pc)
(if_then_else (match_dup 4)
(label_ref (match_dup 3))
(pc)))]
"operands[4] = ((GET_CODE (operands[2]) == GTU) ?
gen_rtx_NE (VOIDmode, cc0_rtx, const0_rtx) :
gen_rtx_EQ (VOIDmode, cc0_rtx, const0_rtx));
operands[5] = GEN_INT (exact_log2 (INTVAL (operands[1]) + 1));")
;; (compare (reg:SI) (const_int)) takes 6 bytes, so we try to achieve
;; the equivalent with shorter sequences. Here is the summary. Cases
;; are grouped for each define_peephole2.