+ * optimization: associative bitwise operations reassociate patterns like
+ (f (f x k1) k2) to expose (f x (f k1 k2)). Same for + and * of
+ rational values.
+ * optimization: quasiquote expressions now perform more constant folding,
+ instead of consing equal lists at runtime. (lp#1026439)
+ * optimization: local call analysis of inlined higher-order function
+ should converge more quickly, resulting in better code for complex
+ functions.
+ * optimization: On x86-64, medium (word-sized but wider than 32 bits)
+ integer constants are handled more cleverly, especially when they
+ can be represented as sign-extended (signed-byte 32). (Based on a
+ patch by Douglas Katzman)
+ * optimization: IF/IF conversion should reliably result in sane code
+ when (some of) the results of the inner IF are always false or
+ always true.
+ * optimization: On x86oids, variable right shifts of machine words are
+ compiled into straight SAR/SHR, instead of going through the generic
+ VOP. (lp#1066204)