Mercurial > hg > truffle
annotate src/share/vm/opto/rootnode.cpp @ 4530:6c6cb7be1324
bugfix
author | Christian Haeubl <christian.haeubl@oracle.com> |
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date | Wed, 08 Feb 2012 21:13:35 -0800 |
parents | f95d63e2154a |
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rev | line source |
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0 | 1 /* |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "memory/allocation.inline.hpp" | |
27 #include "opto/callnode.hpp" | |
28 #include "opto/cfgnode.hpp" | |
29 #include "opto/phaseX.hpp" | |
30 #include "opto/regmask.hpp" | |
31 #include "opto/rootnode.hpp" | |
32 #include "opto/subnode.hpp" | |
33 #include "opto/type.hpp" | |
0 | 34 |
35 //------------------------------Ideal------------------------------------------ | |
36 // Remove dead inputs | |
37 Node *RootNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
38 for( uint i = 1; i < req(); i++ ) { // For all inputs | |
39 // Check for and remove dead inputs | |
40 if( phase->type(in(i)) == Type::TOP ) { | |
41 del_req(i--); // Delete TOP inputs | |
42 } | |
43 } | |
44 | |
45 // I used to do tail-splitting in the Ideal graph here, but it does not | |
46 // work. The tail-splitting forces values live into the Return to be | |
47 // ready at a point which dominates the split returns. This forces Stores | |
48 // to be hoisted high. The "proper" fix would be to split Stores down | |
49 // each path, but this makes the split unprofitable. If we want to do this | |
50 // optimization, it needs to be done after allocation so we can count all | |
51 // the instructions needing to be cloned in the cost metric. | |
52 | |
53 // There used to be a spoof here for caffeine marks which completely | |
54 // eliminated very simple self-recursion recursions, but it's not worth it. | |
55 // Deep inlining of self-calls gets nearly all of the same benefits. | |
56 // If we want to get the rest of the win later, we should pattern match | |
57 // simple recursive call trees to closed-form solutions. | |
58 | |
59 return NULL; // No further opportunities exposed | |
60 } | |
61 | |
62 //============================================================================= | |
63 HaltNode::HaltNode( Node *ctrl, Node *frameptr ) : Node(TypeFunc::Parms) { | |
64 Node* top = Compile::current()->top(); | |
65 init_req(TypeFunc::Control, ctrl ); | |
66 init_req(TypeFunc::I_O, top); | |
67 init_req(TypeFunc::Memory, top); | |
68 init_req(TypeFunc::FramePtr, frameptr ); | |
69 init_req(TypeFunc::ReturnAdr,top); | |
70 } | |
71 | |
72 const Type *HaltNode::bottom_type() const { return Type::BOTTOM; } | |
73 | |
74 //------------------------------Ideal------------------------------------------ | |
75 Node *HaltNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
76 return remove_dead_region(phase, can_reshape) ? this : NULL; | |
77 } | |
78 | |
79 //------------------------------Value------------------------------------------ | |
80 const Type *HaltNode::Value( PhaseTransform *phase ) const { | |
81 return ( phase->type(in(TypeFunc::Control)) == Type::TOP) | |
82 ? Type::TOP | |
83 : Type::BOTTOM; | |
84 } | |
85 | |
86 const RegMask &HaltNode::out_RegMask() const { | |
87 return RegMask::Empty; | |
88 } |