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Narrow parameter of logand/immediate if no bits used

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* module/language/cps/specialize-numbers.scm (specialize-operations):
Narrow ulogand/immediate param according to used bits.
This commit is contained in:
Andy Wingo 2024-09-23 15:57:23 +02:00
parent d6af34c0e0
commit 5e6288c930
1 changed files with 5 additions and 3 deletions
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8
module/language/cps/specialize-numbers.scm
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@ -1,6 +1,6 @@
;;; Continuation-passing style (CPS) intermediate language (IL)
;; Copyright (C) 2015-2021, 2023 Free Software Foundation, Inc.
;; Copyright (C) 2015-2021,2023-2024 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
@ -561,9 +561,11 @@ BITS indicating the significant bits needed for a variable. BITS may be
(specialize-unop cps k src op param a
(unbox-u64 a) (box-u64 result))))
(('logand/immediate (? u64-result? ) param (? u64-operand? a))
(('logand/immediate (? u64-result?) param (? u64-operand? a))
(specialize-unop cps k src 'ulogand/immediate
(logand param (1- (ash 1 64)))
(logand param
(or (intmap-ref sigbits result) -1)
(1- (ash 1 64)))
a
(unbox-u64 a) (box-u64 result)))