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| author | Kazu Hirata <kazu@cs.umass.edu> | 2003-02-12 23:32:21 +0000 |
|---|---|---|
| committer | Kazu Hirata <kazu@gcc.gnu.org> | 2003-02-12 23:32:21 +0000 |
| commit | 2bbfc54272ae1622f1935f916f47eec7373bd943 (patch) | |
| tree | 93fbe60c27222fd9e6ef5d28e239195cec41edef /gcc | |
| parent | e72fcfe8e47d6b453a9a7685c64b8595c32a2252 (diff) | |
| download | gcc-2bbfc54272ae1622f1935f916f47eec7373bd943.zip gcc-2bbfc54272ae1622f1935f916f47eec7373bd943.tar.gz gcc-2bbfc54272ae1622f1935f916f47eec7373bd943.tar.bz2 | |
* config/h8300/h8300.md (a peephole2): New.
From-SVN: r62792
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/config/h8300/h8300.md | 30 |
2 files changed, 34 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 9ee4179..da2df7a 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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 diff --git a/gcc/config/h8300/h8300.md b/gcc/config/h8300/h8300.md index c9cd5f5..31454ba 100644 --- a/gcc/config/h8300/h8300.md +++ b/gcc/config/h8300/h8300.md @@ -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 |