From cb52d0b6ec0c49de4e546bb76c26a3683878191f Mon Sep 17 00:00:00 2001
From: Flyinghead <raphael.jean@gmail.com>
Date: Tue, 9 Mar 2021 14:37:59 +0100
Subject: [PATCH] x64: andn() needs BMI1 cpu feature

Issue #198
---
 core/hw/arm7/arm7_rec_x64.cpp | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/core/hw/arm7/arm7_rec_x64.cpp b/core/hw/arm7/arm7_rec_x64.cpp
index d546b7130..86b5ed5a2 100644
--- a/core/hw/arm7/arm7_rec_x64.cpp
+++ b/core/hw/arm7/arm7_rec_x64.cpp
@@ -90,6 +90,7 @@ class Arm7Compiler : public Xbyak::CodeGenerator
 	static const u32 C_FLAG = 1 << 29;
 	static const u32 V_FLAG = 1 << 28;
 
+	Xbyak::util::Cpu cpu;
 
 	Xbyak::Operand getOperand(const ArmOp::Operand& arg, Xbyak::Reg32 scratch_reg)
 	{
@@ -438,7 +439,25 @@ class Arm7Compiler : public Xbyak::CodeGenerator
 				mov(eax, op.arg[1].getImmediate());
 				arg1 = eax;
 			}
-			andn(rd, static_cast<Xbyak::Reg32&>(arg1), arg0);
+			if (cpu.has(Cpu::tBMI1))
+				andn(rd, static_cast<Xbyak::Reg32&>(arg1), arg0);
+			else
+			{
+				if (rd == arg0)
+				{
+					if (arg1 != r9d)
+						mov(r9d, arg1);
+					not_(r9d);
+					and_(rd, r9d);
+				}
+				else
+				{
+					if (arg1 != rd)
+						mov(rd, static_cast<Xbyak::Reg32&>(arg1));
+					not_(rd);
+					and_(rd, arg0);
+				}
+			}
 			save_v_flag = false;
 			break;