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ARM: If "ADD"'s immediate is less than 0, subtract. 

* lib/arm-mes/arm.M1 (sub____$i8,%r0): New macro.
(sub____$i8,%r1): New macro.
* module/mescc/armv4/as.scm (armv4:call-label): Add comment.
(armv4:r-byte-mem-add): Subtract if value is negative.
(armv4:r-word-mem-add): Subtract if value is negative.
(armv4:local-ptr->r): Subtract if value is negative.
(armv4:r+value): Subtract if value is negative.
(armv4:r0+value): Subtract if value is negative.
This commit is contained in:
Danny Milosavljevic 2019-04-14 22:01:25 +02:00 committed by Jan Nieuwenhuizen
parent 20d0e0d950
commit d0e05a4a80
No known key found for this signature in database
GPG Key ID: F3C1A0D9C1D65273
2 changed files with 19 additions and 5 deletions
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2
lib/arm-mes/arm.M1
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@ -44,6 +44,8 @@ DEFINE add____$i8,%r0 0090e2 # adds r0, r0, #xx; ADDSI = immediate op1 '09' op
# 1090e2 # adds r1, r0, #xx; ADDSI = immediate op1 '09' op2 'e2'
DEFINE add____$i8,%r1 1091e2 # adds r1, r1, #xx
DEFINE add____$i8,%r13 d09de2 # adds r13, r13, #xx
DEFINE sub____$i8,%r0 0050e2 # subs r0, r0, #xx
DEFINE sub____$i8,%r1 1051e2 # subs r1, r1, #xx
DEFINE add____%r0,%r0 000090e0 # adds r0, r0, r0
DEFINE add____%r0,%r1 001091e0 # adds r1, r1, r0
DEFINE add____%r1,%r0 010090e0 # adds r0, r0, r1

22
module/mescc/armv4/as.scm
View File

@ -87,6 +87,7 @@
(define (armv4:call-label info label n)
`(((#:offset3 ,label) bl)
; FIXME: Can n be negative?
((#:immediate1 ,(* n 4)) "add____$i8,%esp")))
(define (armv4:r->arg info i)
@ -139,7 +140,9 @@
(let ((r (get-r info)))
`((,(string-append "push___%r0"))
(,(string-append "ldrb___%r0,(%" r ")"))
((#:immediate1 ,v) ,(string-append "add____$i8,%r0"))
,(if (< v 0)
`((#:immediate1 ,(abs v)) ,(string-append "sub____$i8,%r0"))
`((#:immediate1 ,v) ,(string-append "add____$i8,%r0")))
(,(string-append "strb___%r0,(%" r ")"))
(,(string-append "pop____%r0")))))
@ -148,7 +151,9 @@
`((,(string-append "push___%r0"))
(,(string-append "ldrh___%r0,(%" r ")"))
;; FIXME: That's not complete.
((#:immediate1 ,v) ,(string-append "add____$i8,%r0"))
,(if (< v 0)
`((#:immediate1 ,(abs v)) ,(string-append "sub____$i8,%r0"))
`((#:immediate1 ,v) ,(string-append "add____$i8,%r0")))
(,(string-append "strh___%r0,(%" r ")"))
(,(string-append "pop____%r0")))))
@ -157,7 +162,9 @@
(let ((n (- 0 (* 4 n))))
`((,(string-append "mov____%ebp,%" r))
,(if (< (abs n) #x80)
`((#:immediate1 ,n) ,(string-append "add____$i8,%" r))
(if (< n 0)
`((#:immediate1 ,(abs n)) ,(string-append "sub____$i8,%" r))
`((#:immediate1 ,n) ,(string-append "add____$i8,%" r)))
`(,(string-append "add____$i32,%" r) (#:immediate ,n)))))))
(define (armv4:label->r info label)
@ -319,6 +326,7 @@
(define (armv4:call-r info n)
(let ((r (get-r info)))
`((,(string-append "call___*%" r))
;; FIXME: Sign.
((#:immediate1 ,(* n 4)) "add____$i8,%esp"))))
(define (armv4:r0*r1 info)
@ -368,7 +376,9 @@
(define (armv4:r+value info v)
(let ((r (get-r info)))
(if (< (abs v) #x80)
`(((#:immediate1 ,v) ,(string-append "add____$i8,%" r)))
(if (< v 0)
`(((#:immediate1 ,(abs v)) ,(string-append "sub____$i8,%" r)))
`(((#:immediate1 ,v) ,(string-append "add____$i8,%" r))))
`((,(string-append "add____$i32,%" r) (#:immediate ,v))))))
(define (armv4:r0->r1-mem info)
@ -452,7 +462,9 @@
(define (armv4:r0+value info v)
(let ((r0 (get-r0 info)))
(if (< (abs v) #x80)
`(((#:immediate1 ,v) ,(string-append "add____$i8,%" r0)))
(if (< v 0)
`(((#:immediate1 ,(abs v)) ,(string-append "sub____$i8,%" r0)))
`(((#:immediate1 ,v) ,(string-append "add____$i8,%" r0))))
`((,(string-append "add____$i32,%" r0) (#:immediate ,v))))))
(define (armv4:value->r0 info v)