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- Log ----------------------------------------------------------------- commit 0d3125cf5eda435f8dca8f490a01e508e66c69cb Author: Carl Shapiro cshapiro@common-lisp.net Date: Thu Aug 1 21:59:57 2013 -0700

Remove EAX dependency in length/list and retire fast-length/list.

diff --git a/src/compiler/x86/subprim.lisp b/src/compiler/x86/subprim.lisp index c130ed7..f5e5caf 100644 --- a/src/compiler/x86/subprim.lisp +++ b/src/compiler/x86/subprim.lisp @@ -28,66 +28,74 @@ (:translate length) (:args (object :scs (descriptor-reg control-stack) :target ptr)) (:arg-types list) - (:temporary (:sc unsigned-reg :offset eax-offset) eax) (:temporary (:sc descriptor-reg :from (:argument 0)) ptr) + (:temporary (:scs (unsigned-reg)) temp) (:results (count :scs (any-reg))) (:result-types positive-fixnum) (:policy :fast-safe) (:vop-var vop) (:save-p :compute-only) - (:generator 40 - ;; Move OBJECT into a temp we can bash on, and initialize the count. - (move ptr object) - (inst xor count count) - ;; If we are starting with NIL, then it's real easy. - (inst cmp ptr nil-value) - (inst jmp :e done) - ;; Note: we don't have to test to see if the original argument is a - ;; list, because this is a :fast-safe vop. - LOOP - ;; Get the CDR and boost the count. - (loadw ptr ptr cons-cdr-slot list-pointer-type) - (inst add count (fixnumize 1)) - ;; If we hit NIL, then we are done. - (inst cmp ptr nil-value) - (inst jmp :e done) - ;; Otherwise, check to see if we hit the end of a dotted list. If - ;; not, loop back for more. - (move eax ptr) - (inst and al-tn lowtag-mask) - (inst cmp al-tn list-pointer-type) - (inst jmp :e loop) - ;; It's dotted all right. Flame out. - (error-call vop object-not-list-error ptr) - ;; We be done. - DONE)) - -(define-vop (fast-length/list) + (:generator 50 + (let ((done (gen-label)) + (loop (gen-label)) + (not-list (generate-error-code vop object-not-list-error object))) + (move ptr object) + (inst xor count count) + + (inst cmp ptr nil-value) + (inst jmp :e done) + + (emit-label loop) + + (loadw ptr ptr cons-cdr-slot list-pointer-type) + (inst add count (fixnumize 1)) + + (move temp ptr) + (inst and temp lowtag-mask) + (inst cmp temp list-pointer-type) + (inst jmp :ne not-list) + + (inst cmp ptr nil-value) + (inst jmp :ne loop) + + (emit-label done)))) + +#+ignore +(define-vop (length/list) (:translate length) (:args (object :scs (descriptor-reg control-stack) :target ptr)) (:arg-types list) (:temporary (:sc descriptor-reg :from (:argument 0)) ptr) + (:temporary (:scs (unsigned-reg)) temp) (:results (count :scs (any-reg))) (:result-types positive-fixnum) - (:policy :fast) + (:policy :fast-safe) (:vop-var vop) (:save-p :compute-only) - (:generator 30 - ;; Get a copy of OBJECT in a register we can bash on, and - ;; initialize COUNT. - (move ptr object) - (inst xor count count) - ;; If we are starting with NIL, we be done. - (inst cmp ptr nil-value) - (inst jmp :e done) - ;; Indirect the next cons cell, and boost the count. - LOOP - (loadw ptr ptr cons-cdr-slot list-pointer-type) - (inst add count (fixnumize 1)) - ;; If we arn't done, go back for more. - (inst cmp ptr nil-value) - (inst jmp :ne loop) - DONE)) + (:generator 50 + (let ((done (gen-label)) + (loop (gen-label)) + (not-list (generate-error-code vop object-not-list-error object))) + (move ptr object) + (inst xor count count) + + (inst cmp ptr nil-value) + (inst jmp :e done) + + (emit-label loop) + + (loadw ptr ptr cons-cdr-slot list-pointer-type) + (inst add count (fixnumize 1)) + + (move temp ptr) + (inst and temp lowtag-mask) + (inst cmp temp list-pointer-type) + (inst jmp :ne not-list) + + (inst cmp ptr nil-value) + (inst jmp :ne loop) + + (emit-label done))))

(define-static-function length (object) :translate length)

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Summary of changes: src/compiler/x86/subprim.lisp | 100 ++++++++++++++++++++++------------------- 1 file changed, 54 insertions(+), 46 deletions(-)

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