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mes/module/mescc/i386/as.scm
Jan Nieuwenhuizen 72cb975213
GNU Mes. 
Throughout, make these changes

   Copyright headers: GNU Mes
   First mention of name: GNU Mes
   Website: https://www.gnu.org/software/mes
   Git:     git://git.savannah.gnu.org/mes.git
2018-07-22 14:24:36 +02:00

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;;; GNU Mes --- Maxwell Equations of Software
;;; Copyright © 2016,2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
;;;
;;; This file is part of GNU Mes.
;;;
;;; GNU Mes is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Mes is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;; define i386 assembly
;;; Code:
(define-module (mescc i386 as)
#:use-module (mes guile)
#:use-module (mescc as)
#:export (
i386:accu%base
i386:accu*base
i386:accu*n->label
i386:accu*n->local
i386:accu+accu
i386:accu+base
i386:accu+value
i386:accu->base
i386:accu->base-mem
i386:byte-accu->base-mem
i386:word-accu->base-mem
i386:accu->base-mem+n
i386:byte-accu->base-mem+n
i386:word-accu->base-mem+n
i386:accu->label
i386:accu->local
i386:accu->local+n
i386:accu->local+n
i386:accu-and
i386:accu-and-base
i386:accu-and-base-mem
i386:accu-base
i386:accu-cmp-value
i386:accu-mem-add
i386:accu-mem->base-mem
i386:accu-negate
i386:accu-not
i386:accu-or-base
i386:accu-or-base-mem
i386:accu-shl
i386:accu-test
i386:accu-xor-base
i386:accu-zero?
i386:accu/base
i386:accu<->stack
i386:accu<<base
i386:accu>>base
i386:base+value
i386:base->accu
i386:base->accu-mem
i386:base->label
i386:base-mem->accu-mem
i386:base-mem+n->accu
i386:base-mem->accu
i386:base-sub
i386:byte-accu->base-mem
i386:word-accu->base-mem
i386:byte-base->accu-mem
i386:byte-base->accu-mem+n
i386:byte-base-mem->accu
i386:byte-base-sub
i386:byte-local->base
i386:byte-mem->accu
i386:word-mem->accu
i386:byte-mem->base
i386:byte-sub-base
i386:byte-test-base
i386:call-accu
i386:call-label
i386:formal
i386:function-locals
i386:function-preamble
i386:jump
i386:jump
i386:jump-a
i386:jump-ae
i386:jump-b
i386:jump-be
i386:jump-byte-z
i386:jump-g
i386:jump-ge
i386:jump-l
i386:jump-le
i386:jump-nz
i386:jump-z
i386:label->accu
i386:label->base
i386:label-mem->accu
i386:label-mem->base
i386:label-mem-add
i386:local->accu
i386:local->base
i386:local-add
i386:local-address->accu
i386:local-address->accu
i386:local-address->base
i386:local-ptr->accu
i386:local-ptr->base
i386:local-test
i386:mem+n->accu
i386:byte-mem+n->accu
i386:word-mem+n->accu
i386:mem->accu
i386:mem->base
i386:nop
i386:nz->accu
i386:pop-accu
i386:pop-base
i386:push-accu
i386:push-base
i386:push-byte-local-de-de-ref
i386:push-byte-local-de-ref
i386:push-word-local-de-ref
i386:push-label
i386:push-label-mem
i386:push-local
i386:push-local-address
i386:push-local-de-ref
i386:ret
i386:ret-local
i386:sub-base
i386:test-base
i386:value->accu
i386:value->accu-mem
i386:value->accu-mem+n
i386:value->base
i386:value->label
i386:value->local
i386:xor-accu
i386:xor-zf
i386:g?->accu
i386:ge?->accu
i386:l?->accu
i386:le?->accu
i386:a?->accu
i386:ae?->accu
i386:b?->accu
i386:be?->accu
i386:z->accu
i386:byte-accu
i386:signed-byte-accu
i386:word-accu
i386:signed-word-accu
))
(define (i386:nop)
'(("nop")))
(define (i386:function-preamble)
'(("push___%ebp")
("mov____%esp,%ebp")))
(define (i386:function-locals)
`(("sub____%esp,$i32" (#:immediate ,(+ (* 4 1025) (* 20 4)))))) ; sub %esp,xxx 4*1024 buf, 20 local vars
(define (i386:push-label label)
`(("push___$i32" (#:address ,label)))) ; push $0x<label>
(define (i386:push-label-mem label)
`(("mov____0x32,%eax" (#:address ,label)) ; mov 0x804a000,%eax
("push___%eax"))) ; push %eax
;;; locals
(define (i386:push-local n)
(or n (error "invalid value: push-local: " n))
(let ((n (- 0 (* 4 n))))
`(,(if (< (abs n) #x80) `("push___0x8(%ebp)" (#:immediate1 ,n))
`("push___0x32(%ebp)" (#:immediate ,n))))))
(define (i386:push-local-address n)
(or n (error "invalid value: push-local-address: " n))
(let ((n (- 0 (* 4 n))))
`(,(if (< (abs n) #x80) `("lea____0x8(%ebp),%eax" (#:immediate1 ,n))
`("lea____0x32(%ebp),%eax" (#:immediate ,n)))
("push___%eax"))))
(define (i386:push-byte-local-de-ref n)
(or n (error "invalid value: push-byte-local-de-ref: " n))
(let ((n (- 0 (* 4 n))))
`(,(if (< (abs n) #x80) `("mov____0x8(%ebp),%eax" (#:immediate1 ,n))
`("mov____0x32(%ebp),%eax" (#:immediate ,n)))
("movzbl_(%eax),%eax")
("push___%eax"))))
(define (i386:push-word-local-de-ref n)
(or n (error "invalid value: push-word-local-de-ref: " n))
(let ((n (- 0 (* 4 n))))
`(,(if (< (abs n) #x80) `("mov____0x8(%ebp),%eax" (#:immediate1 ,n))
`("mov____0x32(%ebp),%eax" (#:immediate ,n)))
("movzwl_(%eax),%eax")
("push___%eax"))))
(define (i386:push-byte-local-de-de-ref n)
(or n (error "invalid value: push-byte-local-de-de-ref: " n))
(let ((n (- 0 (* 4 n))))
`(,(if (< (abs n) #x80) `("mov____0x8(%ebp),%eax" (#:immediate1 ,n))
`("mov____0x32(%ebp),%eax" (#:immediate ,n)))
("mov____(%eax),%eax")
("movzbl_(%eax),%eax")
("push___%eax"))))
(define (i386:push-local-de-ref n)
(or n (error "invalid value: push-byte-local-de-ref: " n))
(let ((n (- 0 (* 4 n))))
`(,(if (< (abs n) #x80) `("mov____0x8(%ebp),%eax" (#:immediate1 ,n))
`("mov____0x32(%ebp),%eax" (#:immediate ,n)))
("mov____(%eax),%eax")
("push___%eax"))))
(define (i386:local-add n v)
(or n (error "invalid value: i386:local-add: " n))
(let ((n (- 0 (* 4 n))))
`(,(if (and (< (abs n) #x80)
(< (abs v) #x80)) `("add____$i8,0x8(%ebp)" (#:immediate1 ,n) (#:immediate1 ,v))
`("add____$i32,0x32(%ebp)" (#:immediate ,n) (#:immediate ,v))))))
(define (i386:accu->local n)
(or n (error "invalid value: accu->local: " n))
(let ((n (- 0 (* 4 n))))
`(,(if (< (abs n) #x80) `("mov____%eax,0x8(%ebp)" (#:immediate1 ,n))
`("mov____%eax,0x32(%ebp)" (#:immediate ,n))))))
(define (i386:accu->local+n id n)
(let ((n (+ (- 0 (* 4 id)) n)))
`(,(if (< (abs n) #x80) `("mov____%eax,0x8(%ebp)" (#:immediate1 ,n))
`("mov____%eax,0x32(%ebp)" (#:immediate ,n))))))
(define (i386:accu*n->local i n)
(or n (error "invalid value: accu->local: " n))
(let ((o (- 0 (* 4 i))))
(let loop ((i 0))
(if (>= i n) '() ;; FIXME: byte, word-sized
(let ((o (+ o i)))
(append
(if (< (abs o) #x80) `(("mov____0x8(%eax),%ebx" (#:immediate1 ,i))
("mov____%ebx,0x8(%ebp)" (#:immediate1 ,o)))
`(("mov____0x8(%eax),%ebx" (#:immediate1 ,i))
("mov____%ebx,0x32(%ebp)" (#:immediate ,o))))
(loop (+ i 4))))))))
(define (i386:local->accu n)
(or n (error "invalid value: local->accu: " n))
(let ((n (- 0 (* 4 n))))
`(,(if (< (abs n) #x80) `("mov____0x8(%ebp),%eax" (#:immediate1 ,n))
`("mov____0x32(%ebp),%eax" (#:immediate ,n))))))
(define (i386:local-address->accu n)
(or n (error "invalid value: ladd: " n))
(let ((n (- 0 (* 4 n))))
`(,(if (< (abs n) #x80) `("lea____0x8(%ebp),%eax" (#:immediate1 ,n))
`("lea____0x32(%ebp),%eax" (#:immediate ,n))))))
(define (i386:local-ptr->accu n)
(or n (error "invalid value: local-ptr->accu: " n))
(let ((n (- 0 (* 4 n))))
`(("mov____%ebp,%eax") ; mov %ebp,%eax
,(if (< (abs n) #x80) `("add____$i8,%eax" (#:immediate1 ,n))
`("add____$i32,%eax" (#:immediate ,n))))))
(define (i386:byte-local->base n)
(or n (error "invalid value: byte-local->base: " n))
(let ((n (- 0 (* 4 n))))
`(,(if (< (abs n) #x80) `("movzbl_0x8(%ebp),%edx" (#:immediate1 ,n))
`,@(("mov_0x32(%ebp),%edx" (#:immediate ,n))
("movzbl_%dl,%edx"))))))
(define (i386:local->base n)
(or n (error "invalid value: local->base: " n))
(let ((n (- 0 (* 4 n))))
`(,(if (< (abs n) #x80) `("mov____0x8(%ebp),%edx" (#:immediate1 ,n))
`("mov____0x32(%ebp),%edx" (#:immediate ,n))))))
(define (i386:local-address->base n) ;; DE-REF
(or n (error "invalid value: local-address->base: " n))
(let ((n (- 0 (* 4 n))))
`(,(if (< (abs n) #x80) `("lea____0x8(%ebp),%edx" (#:immediate1 ,n))
`("lea____0x32(%ebp),%edx" (#:immediate ,n))))))
(define (i386:local-ptr->base n)
(or n (error "invalid value: local-ptr->base: " n))
(let ((n (- 0 (* 4 n))))
`(("mov____%ebp,%edx") ; mov %ebp,%edx
,(if (< (abs n) #x80) `("add____$i8,%edx" (#:immediate1 ,n))
`("add____$i32,%edx" (#:immediate ,n))))))
(define (i386:value->local n v)
(or n (error "invalid value: value->local: " n))
(let ((n (- 0 (* 4 n))))
`(,(if (< (abs n) #x80) `("mov____$i32,0x8(%ebp)" (#:immediate1 ,n) (#:immediate ,v))
`("mov____$i32,0x32(%ebp)" (#:immediate ,n) (#:immediate ,v))))))
(define (i386:local-test n v)
(or n (error "invalid value: local-test: " n))
(let ((n (- 0 (* 4 n))))
`(,(cond ((and (< (abs n) #x80)
(< (abs v) #x80)) `("cmp____$i8,0x8(%ebp)" (#:immediate1 ,n) (#:immediate1 ,v)))
((< (abs n) #x80) `("cmp____$i32,0x8(%ebp)" (#:immediate1 ,n) (#:immediate ,v)))
((< (abs v) #x80) `("cmp____$i8,0x32(%ebp)" (#:immediate ,n) (#:immediate1 ,v)))
(else `("cmp____$i32,0x32(%ebp)" (#:immediate ,n) (#:immediate ,v)))))))
(define (i386:pop-accu)
'(("pop____%eax"))) ; pop %eax
(define (i386:push-accu)
'(("push___%eax"))) ; push %eax
(define (i386:pop-base)
'(("pop____%edx"))) ; pop %edx
(define (i386:push-base)
'(("push___%edx"))) ; push %edx
(define (i386:ret)
'(("leave") ; leave
("ret"))) ; ret
(define (i386:accu->base)
'(("mov____%eax,%edx"))) ; mov %eax,%edx
(define (i386:accu->base-mem)
'(("mov____%eax,(%edx)"))) ; mov %eax,(%edx)
(define (i386:byte-accu->base-mem)
'(("mov____%al,(%edx)"))) ; mov %al,(%edx)
(define (i386:word-accu->base-mem)
'(("mov____%ax,(%edx)"))) ; mov %ax,(%edx)
(define (i386:accu->base-mem+n n)
(or n (error "invalid value: accu->base-mem+n: " n))
`(,(if (< (abs n) #x80) `("mov____%eax,0x8(%edx)" (#:immediate1 ,n))
`("mov____%eax,0x32(%edx)" (#:immediate ,n)))))
(define (i386:byte-accu->base-mem+n n)
(or n (error "invalid value: accu->base-mem+n: " n))
`(,(if (< (abs n) #x80) `("mov____%al,0x8(%edx)" (#:immediate1 ,n))
`("mov____%al,0x32(%edx)" (#:immediate ,n)))))
(define (i386:word-accu->base-mem+n n)
(or n (error "invalid value: accu->base-mem+n: " n))
`(,(if (< (abs n) #x80) `("mov____%ax,0x8(%edx)" (#:immediate1 ,n))
`("mov____%ax,0x32(%edx)" (#:immediate ,n)))))
(define (i386:accu->label label)
`(("mov____%eax,0x32" (#:address ,label)))) ; mov %eax,0x<label>
(define (i386:accu*n->label label n)
(append
'(("push___%edx"))
(let loop ((i 0))
(if (>= i n) '() ;; FIXME: byte, word-sized
(append
`(("mov____$i32,%edx" (#:address ,label))
("mov____0x8(%eax),%ebx" (#:immediate1 ,i))
("mov____%ebx,0x8(%edx)" (#:immediate1 ,i)))
(loop (+ i 4)))))
'(("pop____%edx"))))
(define (i386:accu-shl n)
(or n (error "invalid value: accu:shl n: " n))
`(("shl____$i8,%eax" (#:immediate1 ,n)))) ; shl $0x8,%eax
(define (i386:accu<<base)
'(("xor____%ecx,%ecx") ; xor %ecx,%ecx
("mov____%edx,%ecx") ; mov %edx,%ecx
("shl____%cl,%eax"))) ; shl %cl,%eax
(define (i386:accu>>base)
'(("xor____%ecx,%ecx") ; xor %ecx,%ecx
("mov____%edx,%ecx") ; mov %edx,%ecx
("shr____%cl,%eax"))) ; shr %cl,%eax
(define (i386:accu-and-base)
'(("and____%edx,%eax")))
(define (i386:accu-and v)
`(("and____$i32,%eax" (#:immediate ,v))))
(define (i386:accu-and-base-mem)
'(("and____(%edx),%eax")))
(define (i386:accu-or-base-mem)
'(("or_____(%edx),%eax")))
(define (i386:accu-not)
'(("not____%eax"))) ; not %eax
(define (i386:accu-or-base)
'(("or_____%edx,%eax"))) ; or %edx,%eax
(define (i386:accu-xor-base)
'(("xor____%edx,%eax"))) ; xor %edx,%eax
(define (i386:accu+accu)
'(("add____%eax,%eax"))) ; add %eax,%eax
(define (i386:accu+base)
`(("add____%edx,%eax"))) ; add %edx,%eax
(define (i386:accu+value v)
`(,(if (< (abs v) #x80) `("add____$i8,%eax" (#:immediate1 ,v))
`("add____$i32,%eax" (#:immediate ,v)))))
(define (i386:base+value v)
`(,(if (< (abs v) #x80) `("add____$i8,%edx" (#:immediate1 ,v))
`("add____$i32,%edx" (#:immediate ,v)))))
(define (i386:accu-base)
`(("sub____%edx,%eax"))) ; sub %edx,%eax
(define (i386:accu*base)
`(("mul____%edx"))) ; mul %edx
(define (i386:accu/base)
'(("mov____%edx,%ebx") ; mov %edx,%ebx
("xor____%edx,%edx") ; xor %edx,%edx
("idiv___%ebx"))) ; div %ebx
(define (i386:accu%base)
'(("mov____%edx,%ebx") ; mov %edx,%ebx
("xor____%edx,%edx") ; xor %edx,%edx
("idiv___%ebx") ; div %ebx
("mov____%edx,%eax"))) ; mov %edx,%eax
(define (i386:base->accu)
'(("mov____%edx,%eax"))) ; mov %edx,%eax
(define (i386:label->accu label)
`(("mov____$i32,%eax" (#:address ,label)))) ; mov $<n>,%eax
(define (i386:label->base label)
`(("mov____$i32,%edx" (#:address ,label)))) ; mov $<n>,%edx
(define (i386:label-mem->accu label)
`(("mov____0x32,%eax" (#:address ,label)))) ; mov 0x<n>,%eax
(define (i386:label-mem->base label)
`(("mov____0x32,%edx" (#:address ,label)))) ; mov 0x<n>,%edx
(define (i386:label-mem-add label v)
`(,(if (< (abs v) #x80) `("add____$i8,0x32" (#:address ,label) (#:immediate1 ,v))
`("add____$i32,0x32" (#:address ,label) (#:immediate ,v)))))
(define (i386:byte-base-mem->accu)
'(("add____%edx,%eax") ; add %edx,%eax
("movzbl_(%eax),%eax"))) ; movzbl (%eax),%eax
(define (i386:byte-mem->accu)
'(("movzbl_(%eax),%eax"))) ; movzbl (%eax),%eax
(define (i386:word-mem->accu)
'(("movzwl_(%eax),%eax")))
(define (i386:byte-mem->base)
'(("movzbl_(%edx),%edx"))) ; movzbl (%edx),%edx
(define (i386:base-mem->accu)
'(("mov____(%edx),%eax")))
(define (i386:mem->accu)
'(("mov____(%eax),%eax")))
(define (i386:mem->base)
'(("mov____(%edx),%edx")))
(define (i386:mem+n->accu n)
`(,(if (< (abs n) #x80) `("mov____0x8(%eax),%eax" (#:immediate1 ,n))
`("mov____0x32(%eax),%eax" (#:immediate ,n)))))
(define (i386:byte-mem+n->accu n)
`(,(if (< (abs n) #x80) `("movzbl_0x8(%eax),%eax" (#:immediate1 ,n))
`("movzbl_0x32(%eax),%eax" (#:immediate ,n)))))
(define (i386:word-mem+n->accu n)
`(,(if (< (abs n) #x80) `("movzwl_0x8(%eax),%eax" (#:immediate1 ,n))
`("movzwl_xb0x32(%eax),%eax" (#:immediate ,n)))))
(define (i386:base-mem+n->accu v)
(or v (error "invalid value: base-mem+n->accu: " v))
`(("add___%edx,%eax")
,(if (< (abs v) #x80) `("mov____0x8(%eax),%eax" (#:immediate1 ,v))
`("mov____0x32(%eax),%eax" (#:immediate ,v)))))
(define (i386:value->accu v)
(or v (error "invalid value: i386:value->accu: " v))
`(("mov____$i32,%eax" (#:immediate ,v)))) ; mov $<v>,%eax
(define (i386:value->accu-mem v)
`(("mov____$i32,(%eax)" (#:immediate ,v)))) ; movl $0x<v>,(%eax)
(define (i386:value->accu-mem+n n v)
(or v (error "invalid value: i386:value->accu-mem+n: " v))
`(,(if (< (abs v) #x80) `("mov____$i32,0x8(%eax)" (#:immediate1 ,n) (#:immediate ,v))
`("mov____$i32,0x32(%eax)" (#:immediate ,n) (#:immediate ,v)))))
(define (i386:base->accu-mem)
'(("mov____%edx,(%eax)"))) ; mov %edx,(%eax)
(define (i386:accu-mem->base-mem)
'(("mov____(%eax),%ecx")
("mov____%ecx,(%edx)")))
(define (i386:base-mem->accu-mem)
'(("mov____(%edx),%ecx") ; mov (%edx),%ecx
("mov____%ecx,(%eax)"))) ; mov %ecx,(%eax)
(define (i386:byte-base->accu-mem)
'(("mov____%dl,(%eax)"))) ; mov %dl,(%eax)
(define (i386:byte-base->accu-mem+n n)
(or n (error "invalid value: byte-base->accu-mem+n: " n))
`(,(if (< (abs n) #x80) `("mov____%dl,0x8(%eax)" (#:immediate1 ,n))
`("mov____%dl,0x32(%eax)" (#:immediate ,n)))))
(define (i386:value->base v)
(or v (error "invalid value: i386:value->base: " v))
`(("mov____$i32,%edx" (#:immediate ,v)))) ; mov $<v>,%edx
(define (i386:accu-mem-add v)
`(,(if (< (abs v) #x80) `("add____$i8,(%eax)" (#:immediate1 ,v))
`("add____$i32,(%eax)" (#:immediate ,v)))))
(define (i386:value->label label v)
(or v (error "invalid value: value->label: " v))
`(("mov____$i32,0x32" (#:address ,label)
(#:immediate ,v))))
(define (i386:call-label label n)
`((call32 (#:offset ,label))
("add____$i8,%esp" (#:immediate1 ,(* n 4)))))
(define (i386:call-accu n)
`(,@(i386:push-accu)
,@(i386:pop-accu)
("call___*%eax") ; call *%eax
("add____$i8,%esp" (#:immediate1 ,(* n 4))))) ; add $00,%esp
(define (i386:accu-zero?)
'(("test___%eax,%eax")))
(define (i386:accu-negate)
'(("sete___%al") ; sete %al
("movzbl_%al,%eax"))) ; movzbl %al,%eax
(define (i386:xor-accu v)
(or v (error "invalid value: i386:xor-accu: n: " v))
`(("xor___$i32,%eax" (#:immediate ,v)))) ;xor $0xff,%eax
(define (i386:xor-zf)
'(("lahf") ; lahf
("xor____$i8,%ah" (#:immediate1 #x40)) ; xor $0x40,%ah
("sahf"))) ; sahf
(define (i386:accu-cmp-value v)
`(,(if (< (abs v) #x80) `("cmp____$i8,%eax" (#:immediate1 ,v))
`("cmp____$i32,%eax" (#:immediate ,v)))))
(define (i386:accu-test)
'(("test___%eax,%eax"))) ; test %eax,%eax
(define (i386:jump label)
`(("jmp32 " (#:offset ,label))))
(define (i386:jump-z label)
`(("je32 " (#:offset ,label)))) ; jz . + <n>
(define (i386:jump-byte-z label)
`(("test___%al,%al") ; test %al,%al
("je32 " (#:offset ,label)))) ; je <n>
;; signed
(define (i386:jump-g label)
`(("jg32 " (#:offset ,label))))
(define (i386:jump-ge label)
`(("jge32 " (#:offset ,label))))
(define (i386:jump-l label)
`(("jl32 " (#:offset ,label))))
(define (i386:jump-le label)
`(("jle32 " (#:offset ,label))))
(define (i386:g?->accu)
'(("setg___%al")
("movzbl_%al,%eax")))
(define (i386:ge?->accu)
'(("setge__%al")
("movzbl_%al,%eax")))
(define (i386:l?->accu)
'(("setl___%al")
("movzbl_%al,%eax")))
(define (i386:le?->accu)
'(("setle__%al")
("movzbl_%al,%eax")))
;; unsigned
(define (i386:jump-a label)
`(("ja32 " (#:offset ,label))))
(define (i386:jump-ae label)
`(("jae32 " (#:offset ,label))))
(define (i386:jump-b label)
`(("jb32 " (#:offset ,label))))
(define (i386:jump-be label)
`(("jbe32 " (#:offset ,label))))
(define (i386:a?->accu)
'(("seta___%al")
("movzbl_%al,%eax")))
(define (i386:ae?->accu)
'(("setae__%al")
("movzbl_%al,%eax")))
(define (i386:b?->accu)
'(("setb___%al")
("movzbl_%al,%eax")))
(define (i386:be?->accu)
'(("setbe__%al")
("movzbl_%al,%eax")))
(define (i386:jump-nz label)
`(("jne32 " (#:offset ,label)))) ; jnz . + <n>
(define (i386:byte-test-base)
'(("cmp____%al,%dl"))) ; cmp %al,%dl
(define (i386:test-base)
(("cmp____%edx,%eax"))) ; cmp %edx,%eax
(define (i386:byte-sub-base)
'(("sub____%dl,%al"))) ; sub %dl,%al
(define (i386:byte-base-sub)
`(("sub____%al,%dl"))) ; sub %al,%dl
(define (i386:sub-base)
`(("sub____%edx,%eax"))) ; sub %edx,%eax
(define (i386:base-sub)
`(("sub____%eax,%edx"))) ; sub %eax,%edx
(define (i386:nz->accu)
'(("setne__%al") ; setne %al
("movzbl_%al,%eax"))) ; movzbl %al,%eax
(define (i386:z->accu)
'(("sete___%al") ; sete %al
("movzbl_%al,%eax"))) ; movzbl %al,%eax
(define (i386:accu<->stack)
'(("xchg___%eax,(%esp)"))) ; xchg %eax,(%esp)
(define (i386:byte-accu)
'(("movzbl_%al,%eax")))
(define (i386:signed-byte-accu)
'(("movsbl_%al,%eax")))
(define (i386:word-accu)
'(("movzwl_%ax,%eax")))
(define (i386:signed-word-accu)
'(("movswl_%ax,%eax")))
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