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rules.386
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rules.386
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# Rules to optimize BCC assembler output for 386
# Many of these rules are very broken, ho hum.
# Rules for loading a long constant
xor ax,ax
xor %[bx|si|di]1,%[bx|si|di]1
=
xor eax,eax
xor eax,eax
mov %[ebx|ecx|edx]1,eax
=
xor %1,%1
xor ax,ax
mov %[bx|si|di]*,%[*|#]0%1
=
mov eax,%0%1<<16
mov ax,%[*|#]0%1
xor %[bx|si|di]2,%[bx|si|di]2
=
mov eax,%0%1 & $0000FFFF
mov ax,%0[%1]
xor %[bx|si|di]2,%[bx|si|di]2
=
movzx eax,word ptr %0[%1]
mov ax,%[si|di]1
xor bx,bx
=
movzx eax,%1
%[movzx|movsx]5 eax,%1
mov %[ebx|ecx|edx]2,eax
=
%5 %2,%1
%[movzx|movsx]5 %[ebx|ecx|edx]1,%2
mov eax,%[#|*]0%3
%[add|and|xor|or]4 eax,%[ebx|ecx|edx]1
=
%5 eax,%2
%4 eax,%0%3
mov ax,%0[%1]
cwde
=
movsx eax,word ptr %0[%1]
mov ax,%[si|di]1
cwde
=
movsx eax,%1
mov ax,%[#|*]3%1
mov %[bx|si|di]*,%[#|*]4%2
=
mov eax,%4%2<<16 + %1
# Rules for pushing variables and constants onto the stack
push %![dword ptr]%1[%[bx|si|di|bp]3]
push %![dword ptr]%(%1-2)[%[bx|si|di|bp]3]
=
push dword ptr %(%1-2)[%3]
push [%1+2]
push [%1]
=
push dword ptr [%1]
push %[bx|si|di]*
push ax
=
push eax
mov eax,%[#|*]0%1
push eax
=
push dword %0%1
mov %1,%[eax|ebx|ecx|edx]2
push dword ptr %1
=
mov %1,%2
push %2
# Rules for loading long variables
mov ax,[%1]
mov %[bx|si|di]*,[%1+2]
=
mov eax,[%1]
mov ax,%1[%[bx|si|di|bp]3]
mov %[bx|si|di]*,%(%1+2)[%[bx|si|di|bp]3]
=
mov eax,%1[%3]
mov ax,#%1[bx]
mov %[bx|si|di]*,#%1+2[bx]
=
mov eax,#%1[bx]
mov [%1],ax
mov [%1+2],%[bx|si|di]*
=
mov [%1],eax
mov [%1+%3],ax
mov [%1+%(%3+2)],%[bx|si|di]*
=
mov [%1+%3],eax
mov %1[%[si|di|bp]3],ax
mov %(%1+2)[%[si|di|bp]3],%[bx|si|di]*
=
mov %1[%3],eax
mov #%1[bx],ax
mov #%1+2[bx],%[bx|si|di]*
=
mov #%1[bx],eax
mov eax,%[#|*]0%1
mov %![dword ptr]%3[%2],eax
=
mov dword ptr %3[%2],%0%1
xor ax,ax
xor %[bx|si|di]3,%[bx|si|di]3
mov %1[%[bx|bp]4],ax
mov %(%1+2)[%[bx|bp]4],%[bx|si|di]3
=
mov dword ptr %1[%4],#0
mov ax,%1
mov %[bx|si|di]5,%2
mov %3[%[bx|bp]6],ax
mov %(%3+2)[%[bx|bp]6],%[bx|si|di]5
=
mov eax,dword ptr %1
mov dword ptr %3[%6],eax
# Long return values are in EAX, so we can skip dx
mov dx,bx
add sp,*%1
=
add sp,*%1
# Rules for manipulating long values
call %1
mov bx,dx
=
call %1
call l%[tstu|tst]*l
=
test eax,eax
call l%[comu|com]*l
=
not eax
mov eax,eax
%1
=
%1
mov %2,%[eax|ebx|ecx|edx]1
mov %[eax|ebx|ecx|edx]1,%2
=
mov %2,%1
cwd
mov bx,dx
=
cwde
mov %[ebx|ecx|edx]0,%1
mov eax,%2
%3 eax,%[ebc|ecx|edx]0
=
mov eax,%2
%3 eax,%1
%[movzx|movsx|mov]0 %[eax|ebx|ecx|edx]2,%4
%[add|and|xor|sub|or]1 %[eax|ebx|ecx|edx]2,%6
mov %6,%[eax|ebx|ecx|edx]2
=
%0 %2,%4
%1 %6,%2
mov eax,%[#|*]0%1
cmp eax,%2
%[jbe |jae |jne |jge |jle ]3 %4
=
cmp dword ptr %2,%0%1
%=[jbe |jae |jne |jge |jle ][jae |jbe |jne |jle |jge ]3 %4
mov eax,%[#|*]0%1
cmp eax,%2
%[jb |ja |je |jg |jl ]3 %4
=
cmp dword ptr %2,%0%1
%=[jb |ja |je |jg |jl ][ja |jb |je |jl |jg ]3 %4
mov eax,%1[%3]
cmp eax,dword %[#|*]0%2
=
cmp dword ptr %1[%3],%0%2
# Rules for calling the bcc library routines.
push %1
push %2
mov eax,%3[bp]
%4 eax,%(%3-4)[bp]
add sp,*8
=
mov edx,%2
mov eax,%1
%4 eax,edx
push %1
mov eax,%2
push eax
mov eax,%3[bp]
%4 eax,%(%3-4)[bp]
add sp,*8
=
mov edx,%2
mov eax,%1
%4 eax,edx
push %1
xor eax,eax
push eax
mov eax,%2[bp]
%3 eax,%(%2-4)[bp]
add sp,*8
=
mov eax,%1
%3 eax,#0
push %1
mov eax,%2
%3 eax,%4[bp]
add sp,*4
=
mov edx,%1
mov eax,%2
%3 eax,edx
push %1
mov eax,%2
%3 eax,%4[bp]
mov %2,eax
add sp,*4
=
mov edx,%1
%3 %2,edx
push %1
push %2
mov eax,%3[bp]
%4 eax,%(%3-4)[bp]
lea sp,%(%3+4)[bp]
=
mov edx,%2
mov eax,%1
%4 eax,edx
push %1
mov eax,%2
push eax
mov eax,%3[bp]
%4 eax,%(%3-4)[bp]
lea sp,%(%3+4)[bp]
=
mov edx,%2
mov eax,%1
%4 eax,edx
push %1
xor eax,eax
push eax
mov eax,%2[bp]
%3 eax,%(%2-4)[bp]
lea sp,%(%2+4)[bp]
=
mov eax,%1
%3 eax,#0
push %1
mov eax,%2
%3 eax,%4[bp]
lea sp,%(%4+4)[bp]
=
mov edx,%1
mov eax,%2
%3 eax,edx
# Rules for calling the basic bcc library routines.
mov di,#%2
call l%3%[ul|l]*
=
%3 eax,[%2]
mov di,*%2
call lsll
=
lsl eax,*%2
lea di,%2
call l%3%[ul|l]*
=
%3 eax,%2
mov di,%[si|di]1
call l%3%[ul|l]*
=
%3 eax,[%1]
mov di,%[ax|bx|cx|dx]1
call l%3%[ul|l]*
=
mov di,%[ax|bx|cx|dx]1
%3 eax,[di]
# Rules for pushing short values
mov %[ax|bx|cx|dx|si|di]2,%0[%1]
push %[ax|bx|cx|dx|si|di]2
=
push word ptr %0[%1]
mov %[ax|bx|cx|dx|si|di]2,%[#|*]0%1
push %[ax|bx|cx|dx|si|di]2
=
push %0%1
# Shifting rules
%[shl|shr]2 %1,*1
%[shl|shr]2 %1,*1
=
%2 %1,*2
mov cl,*%1
%[shl|shr]2 %3,cl
=
%2 %3,*%1
mov dx,ax
shl ax,*%1
add ax,dx
shl ax,*%2
=
mov dx,ax
imul ax,*%(1<%1+1<%2)
mov dx,ax
imul ax,*%1
add ax,dx
=
mov dx,ax
imul ax,*%(%1+1)
mov dx,ax
imul ax,*%1
shl ax,*%2
=
mov dx,ax
imul ax,*%(%1<%2)
mov ax,%![#|*]%4
mov dx,ax
imul ax,*%1
%[add|and|xor|sub|or]2 ax,%![dx]%3
=
imul ax,%4,*%1
%2 ax,%3
mov ax,%![#|*]%4
mov dx,ax
imul ax,*%1
push ax
=
imul ax,%4,*%1
push ax
imul ax,%2,%[#|*]0%1
add ax,%3
mov bx,ax
=
imul bx,%2,%0%1
add bx,%3
# Different rules
%1 dword ptr %[eax|ebx|ecx|edx]3,*%2
=
%1 %3,*%2
%1 dword ptr %[eax|ebx|ecx|edx]3,#%2
=
%1 %3,#%2
eor %1,%2
=
xor %1,%2
com %1
=
not %1
xor bx,bx
=
and eax,#$0000FFFF