Mercurial > hg > truffle
diff src/share/vm/c1/c1_ValueMap.cpp @ 9081:84ab5667f290
8011706: specjvm2008 test xml.transform gets array bound exception with c1
Summary: loop invariant code motion may move load before store to the same field
Reviewed-by: kvn
author | roland |
---|---|
date | Wed, 10 Apr 2013 09:52:49 +0200 |
parents | 46f6f063b272 |
children | de6a9e811145 |
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--- a/src/share/vm/c1/c1_ValueMap.cpp Tue Apr 09 09:54:17 2013 -0700 +++ b/src/share/vm/c1/c1_ValueMap.cpp Wed Apr 10 09:52:49 2013 +0200 @@ -316,6 +316,7 @@ ShortLoopOptimizer* _short_loop_optimizer; Instruction* _insertion_point; ValueStack * _state; + bool _insert_is_pred; void set_invariant(Value v) const { _gvn->set_processed(v); } bool is_invariant(Value v) const { return _gvn->is_processed(v); } @@ -339,6 +340,7 @@ assert(insertion_block->end()->as_Base() == NULL, "cannot insert into entry block"); _insertion_point = insertion_block->end()->prev(); + _insert_is_pred = loop_header->is_predecessor(insertion_block); BlockEnd *block_end = insertion_block->end(); _state = block_end->state_before(); @@ -379,13 +381,13 @@ } else if (cur->as_LoadField() != NULL) { LoadField* lf = (LoadField*)cur; // deoptimizes on NullPointerException - cur_invariant = !lf->needs_patching() && !lf->field()->is_volatile() && !_short_loop_optimizer->has_field_store(lf->field()->type()->basic_type()) && is_invariant(lf->obj()); + cur_invariant = !lf->needs_patching() && !lf->field()->is_volatile() && !_short_loop_optimizer->has_field_store(lf->field()->type()->basic_type()) && is_invariant(lf->obj()) && _insert_is_pred; } else if (cur->as_ArrayLength() != NULL) { ArrayLength *length = cur->as_ArrayLength(); cur_invariant = is_invariant(length->array()); } else if (cur->as_LoadIndexed() != NULL) { LoadIndexed *li = (LoadIndexed *)cur->as_LoadIndexed(); - cur_invariant = !_short_loop_optimizer->has_indexed_store(as_BasicType(cur->type())) && is_invariant(li->array()) && is_invariant(li->index()); + cur_invariant = !_short_loop_optimizer->has_indexed_store(as_BasicType(cur->type())) && is_invariant(li->array()) && is_invariant(li->index()) && _insert_is_pred; } if (cur_invariant) {