SDL_stdlib.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2006 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
/* This file contains portable stdlib functions for SDL */
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#include "SDL_stdinc.h"
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#ifndef HAVE_LIBC
/* These are some C runtime intrinsics that need to be defined */
#if defined(_MSC_VER)
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/* Float to long */
void __declspec(naked) _ftol()
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__asm {
push ebp
mov ebp,esp
sub esp,20h
and esp,0FFFFFFF0h
fld st(0)
fst dword ptr [esp+18h]
fistp qword ptr [esp+10h]
fild qword ptr [esp+10h]
mov edx,dword ptr [esp+18h]
mov eax,dword ptr [esp+10h]
test eax,eax
je integer_QnaN_or_zero
arg_is_not_integer_QnaN:
fsubp st(1),st
test edx,edx
jns positive
fstp dword ptr [esp]
mov ecx,dword ptr [esp]
xor ecx,80000000h
add ecx,7FFFFFFFh
adc eax,0
mov edx,dword ptr [esp+14h]
adc edx,0
jmp localexit
positive:
fstp dword ptr [esp]
mov ecx,dword ptr [esp]
add ecx,7FFFFFFFh
sbb eax,0
mov edx,dword ptr [esp+14h]
sbb edx,0
jmp localexit
integer_QnaN_or_zero:
mov edx,dword ptr [esp+14h]
test edx,7FFFFFFFh
jne arg_is_not_integer_QnaN
fstp dword ptr [esp+18h]
fstp dword ptr [esp+18h]
localexit:
leave
ret
}
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void __declspec(naked) _ftol2_sse()
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_ftol();
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/* 64-bit math operators for 32-bit systems */
void __declspec(naked) _allmul()
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__asm {
push ebp
mov ebp,esp
push edi
push esi
push ebx
sub esp,0Ch
mov eax,dword ptr [ebp+10h]
mov edi,dword ptr [ebp+8]
mov ebx,eax
mov esi,eax
sar esi,1Fh
mov eax,dword ptr [ebp+8]
mul ebx
imul edi,esi
mov ecx,edx
mov dword ptr [ebp-18h],eax
mov edx,dword ptr [ebp+0Ch]
add ecx,edi
imul ebx,edx
mov eax,dword ptr [ebp-18h]
lea ebx,[ebx+ecx]
mov dword ptr [ebp-14h],ebx
mov edx,dword ptr [ebp-14h]
add esp,0Ch
pop ebx
pop esi
pop edi
pop ebp
ret
}
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void __declspec(naked) _alldiv()
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__asm {
push edi
push esi
push ebx
xor edi,edi
mov eax,dword ptr [esp+14h]
or eax,eax
jge L1
inc edi
mov edx,dword ptr [esp+10h]
neg eax
neg edx
sbb eax,0
mov dword ptr [esp+14h],eax
mov dword ptr [esp+10h],edx
L1:
mov eax,dword ptr [esp+1Ch]
or eax,eax
jge L2
inc edi
mov edx,dword ptr [esp+18h]
neg eax
neg edx
sbb eax,0
mov dword ptr [esp+1Ch],eax
mov dword ptr [esp+18h],edx
L2:
or eax,eax
jne L3
mov ecx,dword ptr [esp+18h]
mov eax,dword ptr [esp+14h]
xor edx,edx
div ecx
mov ebx,eax
mov eax,dword ptr [esp+10h]
div ecx
mov edx,ebx
jmp L4
L3:
mov ebx,eax
mov ecx,dword ptr [esp+18h]
mov edx,dword ptr [esp+14h]
mov eax,dword ptr [esp+10h]
L5:
shr ebx,1
rcr ecx,1
shr edx,1
rcr eax,1
or ebx,ebx
jne L5
div ecx
mov esi,eax
mul dword ptr [esp+1Ch]
mov ecx,eax
mov eax,dword ptr [esp+18h]
mul esi
add edx,ecx
jb L6
cmp edx,dword ptr [esp+14h]
ja L6
jb L7
cmp eax,dword ptr [esp+10h]
jbe L7
L6:
dec esi
L7:
xor edx,edx
mov eax,esi
L4:
dec edi
jne L8
neg edx
neg eax
sbb edx,0
L8:
pop ebx
pop esi
pop edi
ret 10h
}
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void __declspec(naked) _aulldiv()
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__asm {
push ebx
push esi
mov eax,dword ptr [esp+18h]
or eax,eax
jne L1
mov ecx,dword ptr [esp+14h]
mov eax,dword ptr [esp+10h]
xor edx,edx
div ecx
mov ebx,eax
mov eax,dword ptr [esp+0Ch]
div ecx
mov edx,ebx
jmp L2
L1:
mov ecx,eax
mov ebx,dword ptr [esp+14h]
mov edx,dword ptr [esp+10h]
mov eax,dword ptr [esp+0Ch]
L3:
shr ecx,1
rcr ebx,1
shr edx,1
rcr eax,1
or ecx,ecx
jne L3
div ebx
mov esi,eax
mul dword ptr [esp+18h]
mov ecx,eax
mov eax,dword ptr [esp+14h]
mul esi
add edx,ecx
jb L4
cmp edx,dword ptr [esp+10h]
ja L4
jb L5
cmp eax,dword ptr [esp+0Ch]
jbe L5
L4:
dec esi
L5:
xor edx,edx
mov eax,esi
L2:
pop esi
pop ebx
ret 10h
}
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void __declspec(naked) _allrem()
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__asm {
push ebx
push edi
xor edi,edi
mov eax,dword ptr [esp+10h]
or eax,eax
jge L1
inc edi
mov edx,dword ptr [esp+0Ch]
neg eax
neg edx
sbb eax,0
mov dword ptr [esp+10h],eax
mov dword ptr [esp+0Ch],edx
L1:
mov eax,dword ptr [esp+18h]
or eax,eax
jge L2
mov edx,dword ptr [esp+14h]
neg eax
neg edx
sbb eax,0
mov dword ptr [esp+18h],eax
mov dword ptr [esp+14h],edx
L2:
or eax,eax
jne L3
mov ecx,dword ptr [esp+14h]
mov eax,dword ptr [esp+10h]
xor edx,edx
div ecx
mov eax,dword ptr [esp+0Ch]
div ecx
mov eax,edx
xor edx,edx
dec edi
jns L4
jmp L8
L3:
mov ebx,eax
mov ecx,dword ptr [esp+14h]
mov edx,dword ptr [esp+10h]
mov eax,dword ptr [esp+0Ch]
L5:
shr ebx,1
rcr ecx,1
shr edx,1
rcr eax,1
or ebx,ebx
jne L5
div ecx
mov ecx,eax
mul dword ptr [esp+18h]
xchg eax,ecx
mul dword ptr [esp+14h]
add edx,ecx
jb L6
cmp edx,dword ptr [esp+10h]
ja L6
jb L7
cmp eax,dword ptr [esp+0Ch]
jbe L7
L6:
sub eax,dword ptr [esp+14h]
sbb edx,dword ptr [esp+18h]
L7:
sub eax,dword ptr [esp+0Ch]
sbb edx,dword ptr [esp+10h]
dec edi
jns L8
L4:
neg edx
neg eax
sbb edx,0
L8:
pop edi
pop ebx
ret 10h
}
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void __declspec(naked) _aullrem()
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__asm {
push ebx
mov eax,dword ptr [esp+14h]
or eax,eax
jne L1
mov ecx,dword ptr [esp+10h]
mov eax,dword ptr [esp+0Ch]
xor edx,edx
div ecx
mov eax,dword ptr [esp+8]
div ecx
mov eax,edx
xor edx,edx
jmp L2
L1:
mov ecx,eax
mov ebx,dword ptr [esp+10h]
mov edx,dword ptr [esp+0Ch]
mov eax,dword ptr [esp+8]
L3:
shr ecx,1
rcr ebx,1
shr edx,1
rcr eax,1
or ecx,ecx
jne L3
div ebx
mov ecx,eax
mul dword ptr [esp+14h]
xchg eax,ecx
mul dword ptr [esp+10h]
add edx,ecx
jb L4
cmp edx,dword ptr [esp+0Ch]
ja L4
jb L5
cmp eax,dword ptr [esp+8]
jbe L5
L4:
sub eax,dword ptr [esp+10h]
sbb edx,dword ptr [esp+14h]
L5:
sub eax,dword ptr [esp+8]
sbb edx,dword ptr [esp+0Ch]
neg edx
neg eax
sbb edx,0
L2:
pop ebx
ret 10h
}
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void __declspec(naked) _alldvrm()
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__asm {
push edi
push esi
push ebp
xor edi,edi
xor ebp,ebp
mov eax,dword ptr [esp+14h]
or eax,eax
jge L1
inc edi
inc ebp
mov edx,dword ptr [esp+10h]
neg eax
neg edx
sbb eax,0
mov dword ptr [esp+14h],eax
mov dword ptr [esp+10h],edx
L1:
mov eax,dword ptr [esp+1Ch]
or eax,eax
jge L2
inc edi
mov edx,dword ptr [esp+18h]
neg eax
neg edx
sbb eax,0
mov dword ptr [esp+1Ch],eax
mov dword ptr [esp+18h],edx
L2:
or eax,eax
jne L3
mov ecx,dword ptr [esp+18h]
mov eax,dword ptr [esp+14h]
xor edx,edx
div ecx
mov ebx,eax
mov eax,dword ptr [esp+10h]
div ecx
mov esi,eax
mov eax,ebx
mul dword ptr [esp+18h]
mov ecx,eax
mov eax,esi
mul dword ptr [esp+18h]
add edx,ecx
jmp L4
L3:
mov ebx,eax
mov ecx,dword ptr [esp+18h]
mov edx,dword ptr [esp+14h]
mov eax,dword ptr [esp+10h]
L5:
shr ebx,1
rcr ecx,1
shr edx,1
rcr eax,1
or ebx,ebx
jne L5
div ecx
mov esi,eax
mul dword ptr [esp+1Ch]
mov ecx,eax
mov eax,dword ptr [esp+18h]
mul esi
add edx,ecx
jb L6
cmp edx,dword ptr [esp+14h]
ja L6
jb L7
cmp eax,dword ptr [esp+10h]
jbe L7
L6:
dec esi
sub eax,dword ptr [esp+18h]
sbb edx,dword ptr [esp+1Ch]
L7:
xor ebx,ebx
L4:
sub eax,dword ptr [esp+10h]
sbb edx,dword ptr [esp+14h]
dec ebp
jns L9
neg edx
neg eax
sbb edx,0
L9:
mov ecx,edx
mov edx,ebx
mov ebx,ecx
mov ecx,eax
mov eax,esi
dec edi
jne L8
neg edx
neg eax
sbb edx,0
L8:
pop ebp
pop esi
pop edi
ret 10h
}
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void __declspec(naked) _aulldvrm()
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__asm {
push esi
mov eax,dword ptr [esp+14h]
or eax,eax
jne L1
mov ecx,dword ptr [esp+10h]
mov eax,dword ptr [esp+0Ch]
xor edx,edx
div ecx
mov ebx,eax
mov eax,dword ptr [esp+8]
div ecx
mov esi,eax
mov eax,ebx
mul dword ptr [esp+10h]
mov ecx,eax
mov eax,esi
mul dword ptr [esp+10h]
add edx,ecx
jmp L2
L1:
mov ecx,eax
mov ebx,dword ptr [esp+10h]
mov edx,dword ptr [esp+0Ch]
mov eax,dword ptr [esp+8]
L3:
shr ecx,1
rcr ebx,1
shr edx,1
rcr eax,1
or ecx,ecx
jne L3
div ebx
mov esi,eax
mul dword ptr [esp+14h]
mov ecx,eax
mov eax,dword ptr [esp+10h]
mul esi
add edx,ecx
jb L4
cmp edx,dword ptr [esp+0Ch]
ja L4
jb L5
cmp eax,dword ptr [esp+8]
jbe L5
L4:
dec esi
sub eax,dword ptr [esp+10h]
sbb edx,dword ptr [esp+14h]
L5:
xor ebx,ebx
L2:
sub eax,dword ptr [esp+8]
sbb edx,dword ptr [esp+0Ch]
neg edx
neg eax
sbb edx,0
mov ecx,edx
mov edx,ebx
mov ebx,ecx
mov ecx,eax
mov eax,esi
pop esi
ret 10h
}
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void __declspec(naked) _allshl()
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__asm {
cmp cl,40h
jae RETZERO
cmp cl,20h
jae MORE32
shld edx,eax,cl
shl eax,cl
ret
MORE32:
mov edx,eax
xor eax,eax
and cl,1Fh
shl edx,cl
ret
RETZERO:
xor eax,eax
xor edx,edx
ret
}
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void __declspec(naked) _aullshr()
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__asm {
cmp cl,40h
jae RETZERO
cmp cl,20h
jae MORE32
shrd eax,edx,cl
shr edx,cl
ret
MORE32:
mov eax,edx
xor edx,edx
and cl,1Fh
shr eax,cl
ret
RETZERO:
xor eax,eax
xor edx,edx
ret
}
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}
#endif /* MSC_VER */
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#endif /* !HAVE_LIBC */