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compile.c: optimize branches

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* compile.c (compile_branch_condition, iseq_compile_each0):
  eliminate unreachable branches in NODE_IF.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58815 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2017-05-20 11:40:57 +00:00
parent 4b39eaf4cc
commit 52de826096
1 changed files with 16 additions and 7 deletions
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11
compile.c
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@ -2909,6 +2909,7 @@ compile_branch_condition(rb_iseq_t *iseq, LINK_ANCHOR *const ret, NODE *cond,
LABEL *label = NEW_LABEL(nd_line(cond));
CHECK(compile_branch_condition(iseq, ret, cond->nd_1st, label,
else_label));
if (!label->refcnt) break;
ADD_LABEL(ret, label);
cond = cond->nd_2nd;
goto again;
@ -2918,6 +2919,7 @@ compile_branch_condition(rb_iseq_t *iseq, LINK_ANCHOR *const ret, NODE *cond,
LABEL *label = NEW_LABEL(nd_line(cond));
CHECK(compile_branch_condition(iseq, ret, cond->nd_1st, then_label,
label));
if (!label->refcnt) break;
ADD_LABEL(ret, label);
cond = cond->nd_2nd;
goto again;
@ -4250,7 +4252,7 @@ iseq_compile_each0(rb_iseq_t *iseq, LINK_ANCHOR *const ret, NODE *node, int popp
INIT_ANCHOR(else_seq);
then_label = NEW_LABEL(line);
else_label = NEW_LABEL(line);
end_label = NEW_LABEL(line);
end_label = 0;
compile_branch_condition(iseq, cond_seq, node->nd_cond,
then_label, else_label);
@ -4259,14 +4261,21 @@ iseq_compile_each0(rb_iseq_t *iseq, LINK_ANCHOR *const ret, NODE *node, int popp
ADD_SEQ(ret, cond_seq);
if (then_label->refcnt) {
ADD_LABEL(ret, then_label);
ADD_SEQ(ret, then_seq);
end_label = NEW_LABEL(line);
ADD_INSNL(ret, line, jump, end_label);
}
if (else_label->refcnt) {
ADD_LABEL(ret, else_label);
ADD_SEQ(ret, else_seq);
}
if (end_label) {
ADD_LABEL(ret, end_label);
}
break;
}