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Use hard-coded values instead of calling __cpuidex

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Igor Pissolati
2025-10-20 22:52:56 -03:00
committed by GitHub
parent 6fe93375e6
commit 65de67b24f
1 changed files with 5 additions and 15 deletions
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20
src/analyzer/main.cpp
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@@ -507,21 +507,11 @@ namespace
if (leaf == 1)
{
std::array<int, 4> regs = {0, 0, 0, 0};
__cpuidex(regs.data(), static_cast<int>(leaf), static_cast<int>(sub));
uint32_t eax = static_cast<uint32_t>(regs[0]);
uint32_t ebx = static_cast<uint32_t>(regs[1]);
uint32_t ecx = static_cast<uint32_t>(regs[2]);
uint32_t edx = static_cast<uint32_t>(regs[3]);
// Disable SSE4.x
ecx &= ~(1u << 19); // SSE4.1
ecx &= ~(1u << 20); // SSE4.2
emu.reg<uint32_t>(x86_register::eax, eax);
emu.reg<uint32_t>(x86_register::ebx, ebx);
emu.reg<uint32_t>(x86_register::ecx, ecx);
emu.reg<uint32_t>(x86_register::edx, edx);
// NOTE: We hard-code these values to disable SSE4.x
emu.reg<uint32_t>(x86_register::eax, 0x000906EA);
emu.reg<uint32_t>(x86_register::ebx, 0x00100800);
emu.reg<uint32_t>(x86_register::ecx, 0xFFE2F38F);
emu.reg<uint32_t>(x86_register::edx, 0xBFEBFBFF);
return instruction_hook_continuation::skip_instruction;
}