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/* i386 assembly routines for inner loop fraction routines in Metafont
and MetaPost. Included from texmfmp.c. By Wayne Sullivan
<wgs@maths.ucd.ie>. */
/*
Converted to inline assembler for Visual C++ [45].xx
by Fabrice Popineau <Fabrice.Popineau@supelec.fr> */
__declspec(naked) fraction __stdcall ztakefraction(integer p, integer q) {
__asm {
push ebp
mov ebp,esp
xor ecx,ecx
mov eax, p
; mov eax, [ebp+8]
cmp eax, 0x80000000
jz LL5
imul q
or edx,edx
jns LL2
neg edx
neg eax
sbb edx, ecx
inc ecx
LL2:
add eax, 0x08000000
adc edx, 0
cmp edx, 0x07ffffff
ja LL3
shrd eax,edx,28
LL1:
jecxz LL4
neg eax
LL4:
mov esp,ebp
pop ebp
ret 8
LL5:
inc ecx
LL3:
mov eax, 0x7fffffff
mov aritherror, 1
jmp LL1
}
}
__declspec(naked) integer __stdcall ztakescaled(integer p, scaled q) {
__asm {
push ebp
mov ebp,esp
; mov eax, [ebp+8]
xor ecx,ecx
mov eax, p
cmp eax, 0x80000000
jz LL5
imul q
or edx,edx
jns LL12
neg edx
neg eax
sbb edx,ecx
inc ecx
LL12:
add eax, 0x00008000
adc edx, 0x0
cmp edx, 0x00007fff
ja LL3
shrd eax,edx,16
LL1:
jecxz LL4
neg eax
LL4:
mov esp,ebp
pop ebp
ret 8
LL5:
inc ecx
LL3:
mov eax, 0x7fffffff
mov aritherror, 1
jmp LL1
}
}
__declspec(naked) scaled __stdcall zmakescaled(integer p, integer q) {
__asm {
mov cx, 16
push ebp
mov ebp,esp
push ebx
; mov edx, [ebp+8]
mov edx, p
xor eax,eax
or edx,edx
jns LL32
inc ch
neg edx
LL32:
; mov ebx, [ebp+12]
mov ebx,q
or ebx,ebx
jns LL33
dec ch
neg ebx
or ebx,ebx
js LL34
LL33:
or edx,edx
js LL34
shrd eax,edx,cl
shr edx,cl
cmp edx,ebx
jae LL34
div ebx
add edx,edx
inc edx
sub ebx,edx
adc eax, 0
jc LL34
cmp eax, 0x7fffffff
ja LL34
LL31: or ch,ch
jz LL35
neg eax
LL35:
pop ebx
mov esp, ebp
pop ebp
ret 8
LL34:
mov eax, 0x7fffffff
mov aritherror, 1
jmp LL31
}
}
__declspec(naked) fraction __stdcall zmakefraction(integer p, integer q) {
__asm {
mov cx, 4
push ebp
mov ebp,esp
push ebx
mov edx, p
; mov [ebp+8],edx
xor eax,eax
or edx,edx
jns LL32
inc ch
neg edx
LL32:
; mov [ebp+12],ebx
mov ebx, q
or ebx,ebx
jns LL33
dec ch
neg ebx
or ebx,ebx
js LL34
LL33:
or edx,edx
js LL34
shrd eax,edx, cl
shr edx,cl
cmp edx,ebx
jae LL34
div ebx
add edx,edx
inc edx
sub ebx,edx
adc eax, 0
jc LL34
cmp eax, 0x7fffffff
ja LL34
LL31: or ch,ch
jz LL35
neg eax
LL35:
pop ebx
mov esp, ebp
pop ebp
ret 8
LL34:
mov eax, 0x7fffffff
mov aritherror, 1
jmp LL31
}
}
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