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compile.c: comments for r52517 [ci skip]

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52538 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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nobu 2015-11-11 09:38:20 +00:00
parent 56e3b49304
commit 66688cde3b
1 changed files with 8 additions and 0 deletions
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8
compile.c
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@ -2001,11 +2001,19 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
} }
if (iobj->insn_id == BIN(pop)) { if (iobj->insn_id == BIN(pop)) {
/*
* putself / putnil / putobject obj / putstring "..."
* pop
* =>
* # do nothing
*/
LINK_ELEMENT *prev = iobj->link.prev; LINK_ELEMENT *prev = iobj->link.prev;
if (prev->type == ISEQ_ELEMENT_INSN) { if (prev->type == ISEQ_ELEMENT_INSN) {
enum ruby_vminsn_type previ = ((INSN *)prev)->insn_id; enum ruby_vminsn_type previ = ((INSN *)prev)->insn_id;
if (previ == BIN(putobject) || previ == BIN(putnil) || if (previ == BIN(putobject) || previ == BIN(putnil) ||
previ == BIN(putself) || previ == BIN(putstring)) { previ == BIN(putself) || previ == BIN(putstring)) {
/* just push operand or static value and pop soon, no
* side effects */
REMOVE_ELEM(prev); REMOVE_ELEM(prev);
REMOVE_ELEM(&iobj->link); REMOVE_ELEM(&iobj->link);
} }