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When the dividend is known at compile time, we can eliminate some of the branching and precompute the result for the overflow case. Before: B8 54 D3 E6 02 mov eax,2E6D354h 85 FF test edi,edi 74 0C je overflow 3D 00 00 00 80 cmp eax,80000000h 75 0C jne normal_path 83 FF FF cmp edi,0FFFFFFFFh 75 07 jne normal_path overflow: C1 F8 1F sar eax,1Fh 8B F8 mov edi,eax EB 05 jmp done normal_path: 99 cdq F7 FF idiv eax,edi 8B F8 mov edi,eax done: After: 85 FF test edi,edi 75 04 jne normal_path 33 FF xor edi,edi EB 0A jmp done normal_path: B8 54 D3 E6 02 mov eax,2E6D354h 99 cdq F7 FF idiv eax,edi 8B F8 mov edi,eax done: Fairly common with constant dividend of zero. Non-zero values occur frequently in Ocarina of Time Master Quest. |
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| .. | ||
| AudioCommon | ||
| Common | ||
| Core | ||
| DiscIO | ||
| DolphinNoGUI | ||
| DolphinQt | ||
| InputCommon | ||
| MacUpdater | ||
| UICommon | ||
| UpdaterCommon | ||
| VideoBackends | ||
| VideoCommon | ||
| WinUpdater | ||
| CMakeLists.txt | ||
| DolphinLib.ARM64.props | ||
| DolphinLib.props | ||
| DolphinLib.vcxproj | ||
| DolphinLib.vcxproj.user | ||
| DolphinLib.x64.props | ||