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Optimize: merge local.set, local.get --> local.tee

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This commit is contained in:
Volker Berlin 2019-03-10 12:05:10 +01:00
parent 86defc3792
commit cd729d1b41
2 changed files with 38 additions and 0 deletions
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19
src/de/inetsoftware/jwebassembly/module/CodeOptimizer.java
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@ -17,6 +17,9 @@ package de.inetsoftware.jwebassembly.module;
import java.util.List;
import de.inetsoftware.jwebassembly.module.WasmInstruction.Type;
import de.inetsoftware.jwebassembly.wasm.VariableOperator;
/**
* Optimize the code of a single method/function through using of WebAssembly features without equivalent in Java.
*
@ -35,6 +38,22 @@ class CodeOptimizer {
WasmInstruction instr = instructions.get( i );
switch( instr.getType() ) {
case Local:
// merge local.set, local.get --> local.tee
if( i == 0 ) {
continue;
}
if( instructions.get( i-1 ).getType() != Type.Local ) {
continue;
}
WasmLocalInstruction local1 = (WasmLocalInstruction)instructions.get( i-1 );
WasmLocalInstruction local2 = (WasmLocalInstruction)instr;
if( local1.getIndex() != local2.getIndex() ) {
continue;
}
if( local1.getOperator() == VariableOperator.set && local2.getOperator() == VariableOperator.get ) {
local1.setOperator( VariableOperator.tee );
instructions.remove( i );
}
break;
default:
}

19
src/de/inetsoftware/jwebassembly/module/WasmLocalInstruction.java
View File

@ -62,6 +62,25 @@ class WasmLocalInstruction extends WasmInstruction {
return Type.Local;
}
/**
* Get the operator
*
* @return the operator
*/
VariableOperator getOperator() {
return op;
}
/**
* Set the operator
*
* @param op
* the operator
*/
void setOperator( VariableOperator op ) {
this.op = op;
}
/**
* Get the number of the locals
*