From 2e549870b734c9b9212c3519d3d4438037c4fb4f Mon Sep 17 00:00:00 2001
From: Miodrag Milanovic <mmicko@gmail.com>
Date: Tue, 19 Jul 2011 08:45:07 +0000
Subject: [PATCH] i386: implemented FCLEX FPU instruction. [Barry Rodewald]

---
 src/emu/cpu/i386/x87ops.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/emu/cpu/i386/x87ops.c b/src/emu/cpu/i386/x87ops.c
index df2bf15c498..0fd441abbaf 100644
--- a/src/emu/cpu/i386/x87ops.c
+++ b/src/emu/cpu/i386/x87ops.c
@@ -182,6 +182,14 @@ static void I386OP(fpu_group_db)(i386_state *cpustate)		// Opcode 0xdb
 	{
 		switch (modrm & 0x3f)
 		{
+			case 0x22:		// FCLEX
+			{
+				// clears exception flags and busy bit.
+				cpustate->fpu_status_word &= ~0x80ff;
+
+				CYCLES(cpustate,1);		// TODO
+				break;
+			}
 			case 0x23:		// FINIT
 			{
 				cpustate->fpu_control_word = 0x37f;