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compile.c: optimize local variable assignments

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* compile.c (iseq_peephole_optimize): eliminate simple self
  assignments of a local variable when the result is used.
  follow-up of r60322.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60340 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2017-10-22 01:46:43 +00:00
parent f644d3ef67
commit 72f88ebcc1
1 changed files with 7 additions and 3 deletions
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10
compile.c
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@ -2597,12 +2597,16 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
}
if (IS_INSN_ID(iobj, getlocal)) {
if (IS_NEXT_INSN_ID(&iobj->link, setlocal)) {
LINK_ELEMENT *set1 = iobj->link.next;
LINK_ELEMENT *niobj = &iobj->link;
if (IS_NEXT_INSN_ID(niobj, dup)) {
niobj = niobj->next;
}
if (IS_NEXT_INSN_ID(niobj, setlocal)) {
LINK_ELEMENT *set1 = niobj->next;
if (OPERAND_AT(iobj, 0) == OPERAND_AT(set1, 0) &&
OPERAND_AT(iobj, 1) == OPERAND_AT(set1, 1)) {
REMOVE_ELEM(set1);
REMOVE_ELEM(&iobj->link);
REMOVE_ELEM(niobj);
}
}
}