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Fix loop identification

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When assigning loop headers, we should treat already detected
loops as collapsed to their loop header, instead of ignoring them.

This fixes the loop header of BB2 in mandel2 if live-range CFG
splitting is enabled.
This commit is contained in:
Nikita Popov 2017-04-17 12:17:32 +02:00
parent f69c108249
commit abf16c18c7
1 changed files with 4 additions and 1 deletions
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5
ext/opcache/Optimizer/zend_cfg.c
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@ -855,7 +855,10 @@ int zend_cfg_identify_loops(const zend_op_array *op_array, zend_cfg *cfg, uint32
}
while (zend_worklist_len(&work)) {
j = zend_worklist_pop(&work);
if (blocks[j].loop_header < 0 && j != i) {
while (blocks[j].loop_header >= 0) {
j = blocks[j].loop_header;
}
if (j != i) {
blocks[j].loop_header = i;
for (k = 0; k < blocks[j].predecessors_count; k++) {
zend_worklist_push(&work, cfg->predecessors[blocks[j].predecessor_offset + k]);