67 lines
2.5 KiB
Zig
67 lines
2.5 KiB
Zig
const builtin = @import("builtin");
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const linkage = if (builtin.is_test) builtin.GlobalLinkage.Internal else builtin.GlobalLinkage.Strong;
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const is_win32 = builtin.os == builtin.Os.windows and builtin.arch == builtin.Arch.i386;
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export nakedcc fn _aulldiv() {
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if (is_win32) {
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@setDebugSafety(this, false);
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@setGlobalLinkage(_aulldiv, linkage);
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asm volatile (
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\\.intel_syntax noprefix
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\\
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\\ push ebx
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\\ push esi
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\\ mov eax,dword ptr [esp+18h]
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\\ or eax,eax
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\\ jne L1
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\\ mov ecx,dword ptr [esp+14h]
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\\ mov eax,dword ptr [esp+10h]
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\\ xor edx,edx
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\\ div ecx
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\\ mov ebx,eax
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\\ mov eax,dword ptr [esp+0Ch]
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\\ div ecx
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\\ mov edx,ebx
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\\ jmp L2
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\\ L1:
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\\ mov ecx,eax
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\\ mov ebx,dword ptr [esp+14h]
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\\ mov edx,dword ptr [esp+10h]
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\\ mov eax,dword ptr [esp+0Ch]
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\\ L3:
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\\ shr ecx,1
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\\ rcr ebx,1
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\\ shr edx,1
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\\ rcr eax,1
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\\ or ecx,ecx
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\\ jne L3
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\\ div ebx
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\\ mov esi,eax
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\\ mul dword ptr [esp+18h]
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\\ mov ecx,eax
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\\ mov eax,dword ptr [esp+14h]
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\\ mul esi
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\\ add edx,ecx
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\\ jb L4
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\\ cmp edx,dword ptr [esp+10h]
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\\ ja L4
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\\ jb L5
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\\ cmp eax,dword ptr [esp+0Ch]
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\\ jbe L5
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\\ L4:
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\\ dec esi
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\\ L5:
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\\ xor edx,edx
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\\ mov eax,esi
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\\ L2:
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\\ pop esi
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\\ pop ebx
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\\ ret 10h
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);
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unreachable;
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}
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@setGlobalLinkage(_aulldiv, builtin.GlobalLinkage.Internal);
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unreachable;
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}
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