Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/opto/reg_split.cpp
src/share/vm/opto/reg_split.cpp
- changeset 5227
- b274ac1dbe11
- parent 4949
- 8373c19be854
- child 5509
- d1034bd8cefc
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| 5226:813f26e34135 | 5227:b274ac1dbe11 |
|---|---|
| 48 // | 48 // |
| 49 // As a side effect, unlink from (hence make dead) coalesced copies. | 49 // As a side effect, unlink from (hence make dead) coalesced copies. |
| 50 // | 50 // |
| 51 | 51 |
| 52 static const char out_of_nodes[] = "out of nodes during split"; | 52 static const char out_of_nodes[] = "out of nodes during split"; |
| 53 | |
| 54 static bool contains_no_live_range_input(const Node* def) { | |
| 55 for (uint i = 1; i < def->req(); ++i) { | |
| 56 if (def->in(i) != NULL && def->in_RegMask(i).is_NotEmpty()) { | |
| 57 return false; | |
| 58 } | |
| 59 } | |
| 60 return true; | |
| 61 } | |
| 53 | 62 |
| 54 //------------------------------get_spillcopy_wide----------------------------- | 63 //------------------------------get_spillcopy_wide----------------------------- |
| 55 // Get a SpillCopy node with wide-enough masks. Use the 'wide-mask', the | 64 // Get a SpillCopy node with wide-enough masks. Use the 'wide-mask', the |
| 56 // wide ideal-register spill-mask if possible. If the 'wide-mask' does | 65 // wide ideal-register spill-mask if possible. If the 'wide-mask' does |
| 57 // not cover the input (or output), use the input (or output) mask instead. | 66 // not cover the input (or output), use the input (or output) mask instead. |
| 1310 pidx = pred->_pre_order; | 1319 pidx = pred->_pre_order; |
| 1311 // Grab reaching def | 1320 // Grab reaching def |
| 1312 Node *def = Reaches[pidx][slidx]; | 1321 Node *def = Reaches[pidx][slidx]; |
| 1313 assert( def, "must have reaching def" ); | 1322 assert( def, "must have reaching def" ); |
| 1314 // If input up/down sense and reg-pressure DISagree | 1323 // If input up/down sense and reg-pressure DISagree |
| 1315 if( def->rematerialize() ) { | 1324 if (def->rematerialize() && contains_no_live_range_input(def)) { |
| 1316 // Place the rematerialized node above any MSCs created during | 1325 // Place the rematerialized node above any MSCs created during |
| 1317 // phi node splitting. end_idx points at the insertion point | 1326 // phi node splitting. end_idx points at the insertion point |
| 1318 // so look at the node before it. | 1327 // so look at the node before it. |
| 1319 int insert = pred->end_idx(); | 1328 int insert = pred->end_idx(); |
| 1320 while (insert >= 1 && | 1329 while (insert >= 1 && |
