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Set scratch reg to rbx if rax is in use.

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This commit is contained in:
Stephen Miller 2026-06-26 09:07:40 -05:00
parent 640a5aa872
commit 5747fbcc54
1 changed files with 4 additions and 4 deletions
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8
src/core/cpu_patches.cpp
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@ -138,8 +138,8 @@ static void GenerateTcbCompare(void* /* address */, const ZydisDecodedOperand* o
const auto dst = ZydisToXbyakRegisterOperand(operands[0]);
#if defined(_WIN32)
// Prepare a scratch register
const Xbyak::Reg64 scratch = rax;
// Prepare a scratch register. Use rax where possible, rbx if rax is in use.
const Xbyak::Reg64 scratch = operands[0].reg.value == ZYDIS_REGISTER_RAX ? rbx : rax;
// Set rsp to before red zone and save scratch register
c.lea(rsp, ptr[rsp - 128]);
@ -170,8 +170,8 @@ static void GenerateTcbExclusiveOr(void* /* address */, const ZydisDecodedOperan
const auto dst = ZydisToXbyakRegisterOperand(operands[0]);
#if defined(_WIN32)
// Prepare a scratch register
const Xbyak::Reg64 scratch = rax;
// Prepare a scratch register. Use rax where possible, rbx if rax is in use.
const Xbyak::Reg64 scratch = operands[0].reg.value == ZYDIS_REGISTER_RAX ? rbx : rax;
// Set rsp to before red zone and save scratch register
c.lea(rsp, ptr[rsp - 128]);