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CPS compiler reduces eq? on constant to eq-constant?

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* module/language/cps/compile-bytecode.scm (compile-function): Expect
  eq-constant? instead of eq-null?, etc.
* module/language/cps/effects-analysis.scm: Likewise.
* module/language/cps/reify-primitives.scm (reify-primitives): For
  eq-constant?, reify a $const unless the constant is an immediate whose
  encoding fits in 16 bits.
* module/language/cps/type-fold.scm (materialize-constant): Helper to
  make a constant from a type, min, and max.
  (fold-eq-constant?): New helper.
  (eq-constant?): New folder.
  (undefined?): Define specifically.
  (define-nullish-predicate-folder): Renamd from
  define-special-immediate-predicate-folder.  Use only for null?, false,
  and nil?.
  (*branch-reducers*): New mechanism.  Reduce eq? to eq-constant? if
  possible.
  (local-type-fold): Refactor to use materialize-constant, and to allow
  reducing branches.
* module/language/cps/types.scm (constant-type): Return three values
  instead of a type entry.
  (constant-type-entry): New function that returns a type entry.  Adapt
  callers.
  (infer-constant-comparison): New helper.
  (eq-constant?): New inferrer.
  (undefined?): New inferrer.
* module/language/tree-il/compile-bytecode.scm (eq-constant?): Fix
  truncate-bits signed arg.
  (define-immediate-type-predicate): Adapt to visit-immediate-tags
  change.
* module/language/tree-il/compile-cps.scm (convert): Convert eq? to
  constant to eq-constant?.  Advantaged is that it gets fixnums and
  chars in addition to special immediates.
* module/language/tree-il/cps-primitives.scm (define-immediate-type-predicate):
  Adapt to allow #f as pred.
* module/system/base/types/internal.scm (immediate-tags): Use #f as pred
  for false, nil, etc.
  (immediate-bits->scm): Adapt.
* module/system/vm/assembler.scm (emit-eq-null?, emit-eq-nil?)
  (emit-eq-false?, emit-eq-true?, emit-unspecified?, emit-eof-object?):
  Remove specialized emitters.
* module/system/vm/assembler.scm (define-immediate-tag=?-macro-assembler):
  Allow for pred to be #f.
* module/system/vm/disassembler.scm (define-immediate-tag-annotation):
  Adapt to pred being #f.
This commit is contained in:
Andy Wingo 2020-08-03 21:49:50 +02:00
parent 1ee99d97db
commit d238566d0e
11 changed files with 227 additions and 146 deletions
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9
module/language/cps/compile-bytecode.scm
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@ -1,6 +1,6 @@
;;; Continuation-passing style (CPS) intermediate language (IL)
;; Copyright (C) 2013-2019 Free Software Foundation, Inc.
;; Copyright (C) 2013-2020 Free Software Foundation, Inc.
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
@ -476,13 +476,8 @@
(#('fixnum? #f (a)) (unary emit-fixnum? a))
(#('heap-object? #f (a)) (unary emit-heap-object? a))
(#('char? #f (a)) (unary emit-char? a))
(#('eq-false? #f (a)) (unary emit-eq-false? a))
(#('eq-nil? #f (a)) (unary emit-eq-nil? a))
(#('eq-null? #f (a)) (unary emit-eq-null? a))
(#('eq-true? #f (a)) (unary emit-eq-true? a))
(#('unspecified? #f (a)) (unary emit-unspecified? a))
(#('eq-constant? imm (a)) (binary-test/imm emit-eq-immediate? a imm))
(#('undefined? #f (a)) (unary emit-undefined? a))
(#('eof-object? #f (a)) (unary emit-eof-object? a))
(#('null? #f (a)) (unary emit-null? a))
(#('false? #f (a)) (unary emit-false? a))
(#('nil? #f (a)) (unary emit-nil? a))