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* module/language/tree-il.scm: Rename let-exp and letrec-exp to let-body and letrec-body. Add <let-values>, a one-expression let-values that should avoid the needless creation of two closures in many common multiple-value cases. We'll need to add an optimization pass to the compiler to produce this form, though, as well as rewriting lambdas into lets, etc. I added this form instead of adding more special cases to the call-with-values compile code because it's a useful intermediate form -- it will allow the optimizer to perform constant folding across more code. * module/language/tree-il.scm (parse-tree-il, unparse-tree-il) (tree-il->scheme, post-order!, pre-order!): Adapt to let/letrec body renaming, and let-values. * module/language/tree-il/analyze.scm (analyze-lexicals): Adapt for renaming, and add cases for let-values. * module/language/tree-il/compile-glil.scm (flatten): Add a new context, `vals', used by let-values code for the values producer. Code that produces multiple values can then jump to the let-values MV return address directly, instead of trampolining into a procedure. Add code to compile let-values. |
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