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Update NEWS.

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* NEWS: Update.
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Andy Wingo 2019-08-13 14:03:43 +02:00
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20
NEWS
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@ -6,17 +6,23 @@ Please send Guile bug reports to bug-guile@gnu.org.
Changes in alpha 2.9.3 (since alpha 2.9.2): Changes in alpha 2.9.4 (since alpha 2.9.3):
* Notable changes * Notable changes
** Improved just-in-time machine code generation ** Improved compilation of `sqrt' and `abs'
Guile's JIT compiler emits better code for indirect procedure calls, Heavy floating-point computations that use `sqrt' and `abs' will be
atomic instructions, numeric comparisons, procedure prologues, faster, as the compiler can unbox inexact rationals (flonums) in more
well-known closures with no free variables, calls and returns, and cases.
allocations. Together these improvements can speed up some benchmarks
by up to 50%. ** Improved compilation of internal `define'
Internal definitions -- like the `define' in `(let () (define x 10)
...)` -- are now compiled more optimally, using the algorithm from
Ghuloum and Dybvig's "Fixing Letrec (reloaded)" paper. This change
makes internal `define' just as efficient as `let', `let*', `letrec',
and similar.