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Emit new instructions in function preludes

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* module/system/vm/assembler.scm (standard-prelude, opt-prelude):
  (kw-prelude): Emit new instructions in function preludes.  Now all
  branches are via the new instructions.  Remove exports for old
  branches.
This commit is contained in:
Andy Wingo 2017-10-30 10:39:37 +01:00
parent 7aff0fff22
commit c92b80be2d
2 changed files with 26 additions and 27 deletions
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24
module/system/vm/assembler.scm
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@ -139,16 +139,12 @@
emit-call/cc
emit-abort
emit-builtin-ref
emit-br-if-nargs-ne
emit-br-if-nargs-lt
emit-br-if-nargs-gt
emit-assert-nargs-ee
emit-assert-nargs-ge
emit-assert-nargs-le
emit-alloc-frame
emit-reset-frame
emit-assert-nargs-ee/locals
emit-br-if-npos-gt
emit-bind-kwargs
emit-bind-rest
emit-box
@ -1273,7 +1269,8 @@ returned instead."
(define-macro-assembler (standard-prelude asm nreq nlocals alternate)
(cond
(alternate
(emit-br-if-nargs-ne asm nreq alternate)
(emit-arguments<=? asm nreq)
(emit-jne asm alternate)
(emit-alloc-frame asm nlocals))
((and (< nreq (ash 1 12)) (< (- nlocals nreq) (ash 1 12)))
(emit-assert-nargs-ee/locals asm nreq (- nlocals nreq)))
@ -1283,13 +1280,20 @@ returned instead."
(define-macro-assembler (opt-prelude asm nreq nopt rest? nlocals alternate)
(if alternate
(emit-br-if-nargs-lt asm nreq alternate)
(begin
(emit-arguments<=? asm nreq)
(emit-jl asm alternate))
(emit-assert-nargs-ge asm nreq))
(cond
(rest?
(emit-bind-rest asm (+ nreq nopt)))
(alternate
(emit-br-if-nargs-gt asm (+ nreq nopt) alternate))
(emit-arguments<=? asm (+ nreq nopt))
;; The arguments<=? instruction sets NONE to indicate greater-than,
;; whereas for <, NONE usually indicates greater-than-or-equal,
;; hence the name jge. Perhaps we just need to rename jge to
;; br-if-none.
(emit-jge asm alternate))
(else
(emit-assert-nargs-le asm (+ nreq nopt))))
(emit-alloc-frame asm nlocals))
@ -1298,9 +1302,11 @@ returned instead."
allow-other-keys? nlocals alternate)
(if alternate
(begin
(emit-br-if-nargs-lt asm nreq alternate)
(emit-arguments<=? asm nreq)
(emit-jl asm alternate)
(unless rest?
(emit-br-if-npos-gt asm nreq (+ nreq nopt) alternate)))
(emit-positional-arguments<=? asm nreq (+ nreq nopt))
(emit-jge asm alternate)))
(emit-assert-nargs-ge asm nreq))
(let ((ntotal (fold (lambda (kw ntotal)
(match kw