Add emitCode support for unary operator nodes

[Sam Weinig]

This includes UnaryPlusNode, NegateNode, BitwiseNotNode and LogicalNotNode.

[Sam Weinig]

Created attachment 20140 [details]
patch

[Geoffrey Garen]

+RegisterID* UnaryPlusNode::emitCode(CodeGenerator& generator, RegisterID* dst)
+{
+    RegisterID* r0 = generator.emitNode(m_expr.get());
+    return generator.emitToJSNumber(dst ? dst : generator.newTemporary(r0), r0);
+}
+

For cases like this (there are a few in your patch), there's no need to pass r0 to newTemporary(). Since r0 is not referenced, newTemporary() will autmatically return it.

The feature of passing a register to newTemporary was intended for situations where the codegen pattern forces you to put r0 in a RefPtr, but you want to advise newTemporary() that, despite your reference, r0 is eligible for reuse as the operation's destination register.

r=me

[Geoffrey Garen]

Comment on attachment 20140 [details]
patch

run-sunspider --squirrelfish, please.

[Sam Weinig]

Landed in r31382.