[Bug target/38824] [4.4 Regression] performance regression of sse code from 4.2/4.3

[bonzini at gnu dot org]

------- Comment #12 from bonzini at gnu dot org  2009-02-06 09:16 -------
There's another peephole2, namely from

[(set (match_operand 0 "register_operand")
      (match_operand 1 "register_operand"))
 (set (match_operand 0 "register_operand")
      (match_operator 3 "arith_or_logical_operator"
          [(match_dup 0)
           (match_operand 2 "memory_operand" "")]))]

to

[(set (match_dup 0) (match_dup 2))
 (set (match_dup 0) (match_op_dup 3 [(match_dup 0) (match_dup 1)])]

for operands[0] != operands[1] and commutative operator 3 (i.e.
plus,mult,and,ior,xor,smin,smax,umin,umax).  Testing a patch.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38824