* module/language/cps.scm ($kclause, $kentry): Instead of having an
entry continuation contain a list of clauses, have the clauses contain
clauses (as in Tree-IL). In some ways it's not as convenient but it
does reflect the continuation tree correctly.
* module/language/cps/arities.scm:
* module/language/cps/closure-conversion.scm:
* module/language/cps/compile-bytecode.scm:
* module/language/cps/constructors.scm:
* module/language/cps/contification.scm:
* module/language/cps/dce.scm:
* module/language/cps/dfg.scm:
* module/language/cps/elide-values.scm:
* module/language/cps/prune-top-level-scopes.scm:
* module/language/cps/reify-primitives.scm:
* module/language/cps/renumber.scm:
* module/language/cps/simplify.scm:
* module/language/cps/slot-allocation.scm:
* module/language/cps/specialize-primcalls.scm:
* module/language/cps/verify.scm:
* module/language/tree-il/compile-cps.scm: Adapt aaaaaaall users.
* module/language/cps/dfg.scm (lookup-cont): Change to take a DFG
instead of a cont table.
(build-cont-table): Change to return a vector.
* module/language/cps/arities.scm:
* module/language/cps/contification.scm:
* module/language/cps/dce.scm:
* module/language/cps/effects-analysis.scm:
* module/language/cps/elide-values.scm:
* module/language/cps/reify-primitives.scm:
* module/language/cps/simplify.scm:
* module/language/cps/slot-allocation.scm: Adapt to lookup-cont and
build-cont-table changes.
* module/language/cps/simplify.scm (compute-beta-reductions):
(beta-reduce): Separate state into two tables, so we can relax current
guarantee that vars and labels are mutually unique.
* module/language/cps/simplify.scm (prune-continuations): Prune
continuations as a post-pass with a fresh DFG. Using a
pre-eta-conversion DFG as we were doing before missed some cases.
* module/language/cps/simplify.scm (compute-eta-reductions): Avoid
trying to eta-reduce a jump-to-self, as in (let lp () (lp)). This
caused the compiler to hang.
* module/language/cps.scm ($callk): New expression type, for calls to
known labels. Part of "low CPS".
* module/language/cps/arities.scm:
* module/language/cps/closure-conversion.scm:
* module/language/cps/compile-bytecode.scm:
* module/language/cps/dce.scm:
* module/language/cps/dfg.scm:
* module/language/cps/effects-analysis.scm:
* module/language/cps/simplify.scm:
* module/language/cps/slot-allocation.scm:
* module/language/cps/verify.scm: Adapt call sites.
* libguile/vm-engine.c (call-label, tail-call-label): New instructions.
Renumber the rest; this is an ABI change.
* libguile/_scm.h (SCM_OBJCODE_MINOR_VERSION):
* module/system/vm/assembler.scm (*bytecode-minor-version*): Bump.
* doc/ref/compiler.texi (CPS in Guile): Document $callk.
