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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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2040 | 2040 |
2041 // The only purpose of a HForceRepresentation is to represent the value | 2041 // The only purpose of a HForceRepresentation is to represent the value |
2042 // after the (possible) HChange instruction. We make it disappear. | 2042 // after the (possible) HChange instruction. We make it disappear. |
2043 if (value->IsForceRepresentation()) { | 2043 if (value->IsForceRepresentation()) { |
2044 value->DeleteAndReplaceWith(HForceRepresentation::cast(value)->value()); | 2044 value->DeleteAndReplaceWith(HForceRepresentation::cast(value)->value()); |
2045 } | 2045 } |
2046 } | 2046 } |
2047 | 2047 |
2048 | 2048 |
2049 void HGraph::InsertRepresentationChanges() { | 2049 void HGraph::InsertRepresentationChanges() { |
2050 HPhase phase("H_Insert representation changes", this); | 2050 HPhase phase("H_Representation changes", this); |
2051 | |
2052 | 2051 |
2053 // Compute truncation flag for phis: Initially assume that all | 2052 // Compute truncation flag for phis: Initially assume that all |
2054 // int32-phis allow truncation and iteratively remove the ones that | 2053 // int32-phis allow truncation and iteratively remove the ones that |
2055 // are used in an operation that does not allow a truncating | 2054 // are used in an operation that does not allow a truncating |
2056 // conversion. | 2055 // conversion. |
2057 // TODO(fschneider): Replace this with a worklist-based iteration. | 2056 // TODO(fschneider): Replace this with a worklist-based iteration. |
2058 for (int i = 0; i < phi_list()->length(); i++) { | 2057 for (int i = 0; i < phi_list()->length(); i++) { |
2059 HPhi* phi = phi_list()->at(i); | 2058 HPhi* phi = phi_list()->at(i); |
2060 if (phi->representation().IsInteger32()) { | 2059 if (phi->representation().IsInteger32()) { |
2061 phi->SetFlag(HValue::kTruncatingToInt32); | 2060 phi->SetFlag(HValue::kTruncatingToInt32); |
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8047 } | 8046 } |
8048 } | 8047 } |
8049 | 8048 |
8050 #ifdef DEBUG | 8049 #ifdef DEBUG |
8051 if (graph_ != NULL) graph_->Verify(false); // No full verify. | 8050 if (graph_ != NULL) graph_->Verify(false); // No full verify. |
8052 if (allocator_ != NULL) allocator_->Verify(); | 8051 if (allocator_ != NULL) allocator_->Verify(); |
8053 #endif | 8052 #endif |
8054 } | 8053 } |
8055 | 8054 |
8056 } } // namespace v8::internal | 8055 } } // namespace v8::internal |
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