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UserspaceEmulator: Fix too-wide accumulator used in 8/16 bit CMPXCHG

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This commit is contained in:
Andreas Kling 2020-07-18 00:13:31 +02:00
parent 8ec8ec8b1c
commit d321dc0a74
1 changed files with 2 additions and 2 deletions
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4
DevTools/UserspaceEmulator/SoftCPU.cpp
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@ -1074,7 +1074,7 @@ void SoftCPU::CMPSW(const X86::Instruction& insn)
void SoftCPU::CMPXCHG_RM16_reg16(const X86::Instruction& insn) void SoftCPU::CMPXCHG_RM16_reg16(const X86::Instruction& insn)
{ {
auto current = insn.modrm().read16(*this, insn); auto current = insn.modrm().read16(*this, insn);
if (current == eax()) { if (current == ax()) {
set_zf(true); set_zf(true);
insn.modrm().write16(*this, insn, gpr16(insn.reg16())); insn.modrm().write16(*this, insn, gpr16(insn.reg16()));
} else { } else {
@ -1098,7 +1098,7 @@ void SoftCPU::CMPXCHG_RM32_reg32(const X86::Instruction& insn)
void SoftCPU::CMPXCHG_RM8_reg8(const X86::Instruction& insn) void SoftCPU::CMPXCHG_RM8_reg8(const X86::Instruction& insn)
{ {
auto current = insn.modrm().read8(*this, insn); auto current = insn.modrm().read8(*this, insn);
if (current == eax()) { if (current == al()) {
set_zf(true); set_zf(true);
insn.modrm().write8(*this, insn, gpr8(insn.reg8())); insn.modrm().write8(*this, insn, gpr8(insn.reg8()));
} else { } else {