Mercurial > hg > truffle
comparison graal/GraalCompiler/src/com/sun/c1x/ir/Instruction.java @ 2805:c3f64b66fc78
Towards removing the next pointer from Constant and ArithmeticOp
| author | Thomas Wuerthinger <thomas@wuerthinger.net> |
|---|---|
| date | Fri, 27 May 2011 19:57:56 +0200 |
| parents | e1dad0edd57a |
| children | 2b8ef0a06391 ac4b086cbd72 |
comparison
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| 2804:095162a84dcc | 2805:c3f64b66fc78 |
|---|---|
| 143 | 143 |
| 144 public Instruction predAt(int j) { | 144 public Instruction predAt(int j) { |
| 145 return (Instruction) predecessors().get(j); | 145 return (Instruction) predecessors().get(j); |
| 146 } | 146 } |
| 147 | 147 |
| 148 @Override | |
| 149 public Merge block() { | |
| 150 Instruction cur = this; | |
| 151 while (!(cur instanceof Merge)) { | |
| 152 List<Node> preds = cur.predecessors(); | |
| 153 cur = (Instruction) preds.get(0); | |
| 154 } | |
| 155 return (Merge) cur; | |
| 156 } | |
| 157 | |
| 158 /** | |
| 159 * Compute the value number of this Instruction. Local and global value numbering | |
| 160 * optimizations use a hash map, and the value number provides a hash code. | |
| 161 * If the instruction cannot be value numbered, then this method should return | |
| 162 * {@code 0}. | |
| 163 * @return the hashcode of this instruction | |
| 164 */ | |
| 165 public int valueNumber() { | |
| 166 return 0; | |
| 167 } | |
| 168 | |
| 169 /** | |
| 170 * Checks that this instruction is equal to another instruction for the purposes | |
| 171 * of value numbering. | |
| 172 * @param i the other instruction | |
| 173 * @return {@code true} if this instruction is equivalent to the specified | |
| 174 * instruction w.r.t. value numbering | |
| 175 */ | |
| 176 public boolean valueEqual(Instruction i) { | |
| 177 return false; | |
| 178 } | |
| 179 | |
| 180 /** | 148 /** |
| 181 * Gets the state after the instruction, if it is recorded. Typically only | 149 * Gets the state after the instruction, if it is recorded. Typically only |
| 182 * instances of {@link BlockEnd} have a non-null state after. | 150 * instances of {@link BlockEnd} have a non-null state after. |
| 183 * @return the state after the instruction | 151 * @return the state after the instruction |
| 184 */ | 152 */ |