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Repairs common subexpression elimination and renames it to global value

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numbering, as it is really pessimistic GVN
This commit is contained in:
konsoletyper 2014-03-07 23:13:07 +04:00
parent 4b624d8027
commit 4143e6c8d7
2 changed files with 3 additions and 4 deletions
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3
teavm-core/src/main/java/org/teavm/optimization/ClassSetOptimizer.java
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@ -36,8 +36,7 @@ public class ClassSetOptimizer {
}
private List<MethodOptimization> getOptimizations() {
// TODO: repair CommonSubexpressionElimination and get it back here
return Arrays.<MethodOptimization>asList(new UnusedVariableElimination());
return Arrays.<MethodOptimization>asList(new GlobalValueNumbering(), new UnusedVariableElimination());
}
public void optimizeAll(ListableClassHolderSource classSource) {

4
teavm-core/src/main/java/org/teavm/optimization/CommonSubexpressionElimination.java → teavm-core/src/main/java/org/teavm/optimization/GlobalValueNumbering.java
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@ -30,7 +30,7 @@ import org.teavm.model.util.ProgramUtils;
*
* @author Alexey Andreev
*/
public class CommonSubexpressionElimination implements MethodOptimization {
public class GlobalValueNumbering implements MethodOptimization {
private Map<String, KnownValue> knownValues = new HashMap<>();
private boolean eliminate;
private int[] map;
@ -137,7 +137,7 @@ public class CommonSubexpressionElimination implements MethodOptimization {
private void bind(int var, String value) {
KnownValue known = knownValues.get(value);
if (known != null && domTree.dominates(known.location, currentBlockIndex)) {
if (known != null && domTree.dominates(known.location, currentBlockIndex) && known.value != var) {
eliminate = true;
map[var] = known.value;
} else {