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compile.c: optimize useless branches

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* compile.c (iseq_peephole_optimize): eliminate always/never
  branches after a literal object.  this sequence typically
  appears by defined? operator for a method call on a local
  variable.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52633 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2015-11-18 02:32:17 +00:00
parent e4fc85dfcf
commit 4a23f0695a
2 changed files with 34 additions and 0 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
Wed Nov 18 11:32:15 2015 Nobuyoshi Nakada <nobu@ruby-lang.org>
* compile.c (iseq_peephole_optimize): eliminate always/never
branches after a literal object. this sequence typically
appears by defined? operator for a method call on a local
variable.
Wed Nov 18 10:33:06 2015 NAKAMURA Usaku <usa@ruby-lang.org>
* ext/socket/ancdata.c (bsock_recvmsg_internal): stretch the buffer size

27
compile.c
View file

@ -2031,6 +2031,33 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
*/
replace_destination(iobj, nobj);
}
else if (pobj) {
int cond;
if (pobj->insn_id == BIN(putobject)) {
cond = (iobj->insn_id == BIN(branchif) ?
OPERAND_AT(pobj, 0) != Qfalse :
iobj->insn_id == BIN(branchunless) ?
OPERAND_AT(pobj, 0) == Qfalse :
FALSE);
}
else if (pobj->insn_id == BIN(putstring)) {
cond = iobj->insn_id == BIN(branchif);
}
else if (pobj->insn_id == BIN(putnil)) {
cond = iobj->insn_id != BIN(branchif);
}
else break;
REMOVE_ELEM(&pobj->link);
if (cond) {
iobj->insn_id = BIN(jump);
goto again;
}
else {
unref_destination(iobj);
REMOVE_ELEM(&iobj->link);
}
break;
}
else break;
nobj = (INSN *)get_destination_insn(nobj);
}