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Better unboxing for logand over s64 values

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* module/language/cps/specialize-numbers.scm (specialize-operations): Do
  a better job unboxing logand if we know the result is a u64, even if
  arguments are s64.
This commit is contained in:
Andy Wingo 2017-11-22 11:34:25 +01:00
parent 695362a830
commit 3ae2a88c15
1 changed files with 20 additions and 0 deletions
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20
module/language/cps/specialize-numbers.scm
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@ -484,6 +484,26 @@ BITS indicating the significant bits needed for a variable. BITS may be
(unbox-u64 a) (unbox-u64 b) (box-u64 result)))
(setk label ($kargs names vars ,body)))))
(((or 'logand 'logior 'logxor 'logsub)
(? u64-result?) #f (? s64-operand? a) (? s64-operand? b))
(let ((op (match op
('logand 'ulogand) ('logior 'ulogior)
('logxor 'ulogxor) ('logsub 'ulogsub))))
(define (unbox-u64* x)
(let ((unbox-s64 (unbox-s64 x)))
(lambda (cps k src x)
(with-cps cps
(letv s64)
(letk ks64 ($kargs ('s64) (s64)
($continue k src
($primcall 's64->u64 #f (s64)))))
($ (unbox-s64 k src x))))))
(with-cps cps
(let$ body (specialize-binop
k src op a b
(unbox-u64* a) (unbox-u64* b) (box-u64 result)))
(setk label ($kargs names vars ,body)))))
(((or 'add 'sub 'mul)
(? s64-result?) #f (? s64-operand? a) (? s64-operand? b))
(let ((op (match op