Improved code generation

src/build/core/ExpressionToRegister.go

@@ -0,0 +1,33 @@
+package core
+
+import (
+	"git.akyoto.dev/cli/q/src/build/asm"
+	"git.akyoto.dev/cli/q/src/build/ast"
+	"git.akyoto.dev/cli/q/src/build/cpu"
+	"git.akyoto.dev/cli/q/src/build/expression"
+)
+
+// ExpressionToRegister puts the result of an expression into the specified register.
+func (f *Function) ExpressionToRegister(root *expression.Expression, register cpu.Register) error {
+	if root.IsLeaf() {
+		return f.TokenToRegister(root.Token, register)
+	}
+
+	if ast.IsFunctionCall(root) {
+		err := f.CompileCall(root)
+		f.assembler.RegisterRegister(asm.MOVE, register, f.cpu.Output[0])
+		return err
+	}
+
+	left := root.Children[0]
+	right := root.Children[1]
+
+	err := f.ExpressionToRegister(left, register)
+
+	if err != nil {
+		return err
+	}
+
+	f.SaveRegister(register)
+	return f.Execute(root.Token, register, right)
+}