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Minor optimization of expression negation

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This commit is contained in:
Alexey Andreev 2016-08-08 11:49:14 +03:00
parent 964d2cdf5b
commit 055312055b
1 changed files with 58 additions and 0 deletions
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58
core/src/main/java/org/teavm/wasm/generate/WasmGenerationVisitor.java
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@ -635,11 +635,69 @@ class WasmGenerationVisitor implements StatementVisitor, ExprVisitor {
return binary.getFirst();
}
}
WasmIntBinaryOperation negatedOp = negate(binary.getOperation());
if (negatedOp != null) {
return new WasmIntBinary(binary.getType(), negatedOp, binary.getFirst(), binary.getSecond());
}
} else if (expr instanceof WasmFloatBinary) {
WasmFloatBinary binary = (WasmFloatBinary) expr;
WasmFloatBinaryOperation negatedOp = negate(binary.getOperation());
if (negatedOp != null) {
return new WasmFloatBinary(binary.getType(), negatedOp, binary.getFirst(), binary.getSecond());
}
}
return new WasmIntBinary(WasmIntType.INT32, WasmIntBinaryOperation.XOR, expr, new WasmInt32Constant(1));
}
private boolean isOne(WasmExpression expression) {
return expression instanceof WasmInt32Constant && ((WasmInt32Constant) expression).getValue() == 1;
}
private WasmIntBinaryOperation negate(WasmIntBinaryOperation op) {
switch (op) {
case EQ:
return WasmIntBinaryOperation.NE;
case NE:
return WasmIntBinaryOperation.EQ;
case LT_SIGNED:
return WasmIntBinaryOperation.GE_SIGNED;
case LT_UNSIGNED:
return WasmIntBinaryOperation.GE_UNSIGNED;
case LE_SIGNED:
return WasmIntBinaryOperation.GT_SIGNED;
case LE_UNSIGNED:
return WasmIntBinaryOperation.GT_UNSIGNED;
case GT_SIGNED:
return WasmIntBinaryOperation.LE_SIGNED;
case GT_UNSIGNED:
return WasmIntBinaryOperation.LE_UNSIGNED;
case GE_SIGNED:
return WasmIntBinaryOperation.LT_SIGNED;
case GE_UNSIGNED:
return WasmIntBinaryOperation.LT_UNSIGNED;
default:
return null;
}
}
private WasmFloatBinaryOperation negate(WasmFloatBinaryOperation op) {
switch (op) {
case EQ:
return WasmFloatBinaryOperation.NE;
case NE:
return WasmFloatBinaryOperation.EQ;
case LT:
return WasmFloatBinaryOperation.GE;
case LE:
return WasmFloatBinaryOperation.GT;
case GT:
return WasmFloatBinaryOperation.LE;
case GE:
return WasmFloatBinaryOperation.LT;
default:
return null;
}
}
}