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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 part of ssa; | |
6 | |
7 /** | 5 /** |
8 * Instead of emitting each SSA instruction with a temporary variable | 6 * Instead of emitting each SSA instruction with a temporary variable |
9 * mark instructions that can be emitted at their use-site. | 7 * mark instructions that can be emitted at their use-site. |
10 * For example, in: | 8 * For example, in: |
11 * t0 = 4; | 9 * t0 = 4; |
12 * t1 = 3; | 10 * t1 = 3; |
13 * t2 = add(t0, t1); | 11 * t2 = add(t0, t1); |
14 * t0 and t1 would be marked and the resulting code would then be: | 12 * t0 and t1 would be marked and the resulting code would then be: |
15 * t2 = add(4, 3); | 13 * t2 = add(4, 3); |
16 */ | 14 */ |
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342 } | 340 } |
343 | 341 |
344 // If [thenInput] is defined in the first predecessor, then it is only used | 342 // If [thenInput] is defined in the first predecessor, then it is only used |
345 // by [phi] and can be generated at use site. | 343 // by [phi] and can be generated at use site. |
346 if (identical(thenInput.block, end.predecessors[0])) { | 344 if (identical(thenInput.block, end.predecessors[0])) { |
347 assert(thenInput.usedBy.length == 1); | 345 assert(thenInput.usedBy.length == 1); |
348 markAsGenerateAtUseSite(thenInput); | 346 markAsGenerateAtUseSite(thenInput); |
349 } | 347 } |
350 } | 348 } |
351 } | 349 } |
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