From 567ea726e173040ae931a37bc85fd6cd92b69363 Mon Sep 17 00:00:00 2001
From: LDj3SNuD <35856442+LDj3SNuD@users.noreply.github.com>
Date: Mon, 7 Dec 2020 10:37:07 +0100
Subject: Add support for guest Fz (Fpcr) mode through host Ftz and Daz (Mxcsr)
 modes (fast paths). (#1630)

* Add support for guest Fz (Fpcr) mode through host Ftz and Daz (Mxcsr) modes (fast paths).

* Ptc.InternalVersion = 1630

* Nits.

* Address comments.

* Update Ptc.cs

* Address comment.
---
 ARMeilleure/Instructions/InstEmitSimdHelper.cs | 33 ++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

(limited to 'ARMeilleure/Instructions/InstEmitSimdHelper.cs')

diff --git a/ARMeilleure/Instructions/InstEmitSimdHelper.cs b/ARMeilleure/Instructions/InstEmitSimdHelper.cs
index 69e79a6d..eab891ec 100644
--- a/ARMeilleure/Instructions/InstEmitSimdHelper.cs
+++ b/ARMeilleure/Instructions/InstEmitSimdHelper.cs
@@ -1189,6 +1189,39 @@ namespace ARMeilleure.Instructions
             }
         }
 
+        [Flags]
+        public enum Mxcsr
+        {
+            Ftz = 1 << 15, // Flush To Zero.
+            Um  = 1 << 11, // Underflow Mask.
+            Dm  = 1 << 8,  // Denormal Mask.
+            Daz = 1 << 6   // Denormals Are Zero.
+        }
+
+        public static void EmitSseOrAvxEnterFtzAndDazModesOpF(ArmEmitterContext context, out Operand isTrue)
+        {
+            isTrue = context.Call(typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetFpcrFz)));
+
+            Operand lblTrue = Label();
+            context.BranchIfFalse(lblTrue, isTrue);
+
+            context.AddIntrinsicNoRet(Intrinsic.X86Mxcsrmb, Const((int)(Mxcsr.Ftz | Mxcsr.Um | Mxcsr.Dm | Mxcsr.Daz)));
+
+            context.MarkLabel(lblTrue);
+        }
+
+        public static void EmitSseOrAvxExitFtzAndDazModesOpF(ArmEmitterContext context, Operand isTrue = null)
+        {
+            isTrue ??= context.Call(typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetFpcrFz)));
+
+            Operand lblTrue = Label();
+            context.BranchIfFalse(lblTrue, isTrue);
+
+            context.AddIntrinsicNoRet(Intrinsic.X86Mxcsrub, Const((int)(Mxcsr.Ftz | Mxcsr.Daz)));
+
+            context.MarkLabel(lblTrue);
+        }
+
         public enum CmpCondition
         {
             // Legacy Sse.
-- 
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