Mercurial > hg > truffle
comparison src/share/vm/opto/connode.cpp @ 628:7bb995fbd3c0
Merge
author | trims |
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date | Thu, 12 Mar 2009 18:16:36 -0700 |
parents | 98cb887364d3 |
children | 660978a2a31a |
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580:ce2272390558 | 628:7bb995fbd3c0 |
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69 | 69 |
70 (2) Plug the control edge from 1 of the 2 oops in. Apparent problem here is | 70 (2) Plug the control edge from 1 of the 2 oops in. Apparent problem here is |
71 to figure out which test post-dominates. The real problem is that it doesn't | 71 to figure out which test post-dominates. The real problem is that it doesn't |
72 matter which one you pick. After you pick up, the dominating-test elider in | 72 matter which one you pick. After you pick up, the dominating-test elider in |
73 IGVN can remove the test and allow you to hoist up to the dominating test on | 73 IGVN can remove the test and allow you to hoist up to the dominating test on |
74 the choosen oop bypassing the test on the not-choosen oop. Seen in testing. | 74 the chosen oop bypassing the test on the not-chosen oop. Seen in testing. |
75 Oops. | 75 Oops. |
76 | 76 |
77 (3) Leave the CastPP's in. This makes the graph more accurate in some sense; | 77 (3) Leave the CastPP's in. This makes the graph more accurate in some sense; |
78 we get to keep around the knowledge that an oop is not-null after some test. | 78 we get to keep around the knowledge that an oop is not-null after some test. |
79 Alas, the CastPP's interfere with GVN (some values are the regular oop, some | 79 Alas, the CastPP's interfere with GVN (some values are the regular oop, some |