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Date: Fri, 01 Aug 2014 23:18:00 -0000
Message-ID: <CANqEaAd497Fm09bRx-WiMXiBzL5Dub8FqkWCocDTLsTo_dgYEw@mail.gmail.com>
Subject: fuse multiple ops into one new op
From: Cherry Vanc <cherry.vanc@gmail.com>
To: gcc-help@gcc.gnu.org
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X-SW-Source: 2014-08/txt/msg00010.txt.bz2

I need to fuse multiple instructions into a single one.
...
r1 = (r1) op1 (const)
...
...
r1 = (r1) op2 (r2)
...
...
r3 = op3 (r1)
...

I defined a peephole2 pattern in my GCC backend .md file. If these
three instructions are contiguous, then I do get my test "testnew"
instruction. If these instructions are far apart, I dont.

(define_peephole2
  [(set (match_operand:DI 0 "register_operand" "")
    (op1:DI (match_dup 0) (match_operand:SI 1 "immediate_operand" "") ))
  (set (match_dup 0)
    (op2:DI (match_operand:DI 2 "register_operand" "") (match_dup 0)))
  (set (match_dup 0)
    (sign_extend:DI (op3:SI (match_dup 0))))]
  "TARGET_MYCORE"
  [(set (match_dup 0) (sign_extend:DI (op3:SI (op2:SI (op1:SI
(match_dup 0) (match_dup 1)) (match_dup 0)))))]
  "")

(define_insn "*testnew"
  [(set (match_operand:DI 0 "register_operand" "=d")
        (sign_extend:DI (op3:SI (op2:SI (op1:SI (match_dup 0)
(match_operand:SI 1 "immediate_operand" "I")) (match_dup 0)))))]
  "TARGET_MYCORE"
  "testnew 36"
  [(set_attr "mode" "DI")])

How can I fuse multiple instructions that are far apart into a new
single opcode that MYCORE has ?