From 88c6160c62b000d155a829b23e6207d78b7dccfa Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Thu, 15 Mar 2018 22:36:47 -0300
Subject: [PATCH] Add MLA (vector by element), fixes some cases of MUL (vector
 by element)?

---
 ChocolArm64/AOpCodeTable.cs                        | 1 +
 ChocolArm64/Decoder/AOpCodeSimdRegElem.cs          | 5 ++---
 ChocolArm64/Instruction/AInstEmitSimdArithmetic.cs | 9 +++++++++
 ChocolArm64/Instruction/AInstEmitSimdHelper.cs     | 7 +++++--
 4 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/ChocolArm64/AOpCodeTable.cs b/ChocolArm64/AOpCodeTable.cs
index d32bd9cd..9240c0a7 100644
--- a/ChocolArm64/AOpCodeTable.cs
+++ b/ChocolArm64/AOpCodeTable.cs
@@ -228,6 +228,7 @@ namespace ChocolArm64
             Set("xx111100x11xxxxxxxxx10xxxxxxxxxx", AInstEmit.Ldr,           typeof(AOpCodeSimdMemReg));
             Set("xx011100xxxxxxxxxxxxxxxxxxxxxxxx", AInstEmit.LdrLit,        typeof(AOpCodeSimdMemLit));
             Set("0x001110<<1xxxxx100101xxxxxxxxxx", AInstEmit.Mla_V,         typeof(AOpCodeSimdReg));
+            Set("0x101111xxxxxxxx0000x0xxxxxxxxxx", AInstEmit.Mla_Ve,        typeof(AOpCodeSimdRegElem));
             Set("0x101110<<1xxxxx100101xxxxxxxxxx", AInstEmit.Mls_V,         typeof(AOpCodeSimdReg));
             Set("0x00111100000xxx0xx001xxxxxxxxxx", AInstEmit.Movi_V,        typeof(AOpCodeSimdImm));
             Set("0x00111100000xxx10x001xxxxxxxxxx", AInstEmit.Movi_V,        typeof(AOpCodeSimdImm));
diff --git a/ChocolArm64/Decoder/AOpCodeSimdRegElem.cs b/ChocolArm64/Decoder/AOpCodeSimdRegElem.cs
index 721da88f..d6dc4bd2 100644
--- a/ChocolArm64/Decoder/AOpCodeSimdRegElem.cs
+++ b/ChocolArm64/Decoder/AOpCodeSimdRegElem.cs
@@ -11,9 +11,8 @@ namespace ChocolArm64.Decoder
             switch (Size)
             {
                 case 1:
-                    Index = (OpCode >> 21) & 1 |
-                            (OpCode >> 10) & 2 |
-                            (OpCode >> 18) & 4;
+                    Index = (OpCode >> 20) & 3 |
+                            (OpCode >>  9) & 4;
 
                     Rm &= 0xf;
 
diff --git a/ChocolArm64/Instruction/AInstEmitSimdArithmetic.cs b/ChocolArm64/Instruction/AInstEmitSimdArithmetic.cs
index bf980a58..989b470e 100644
--- a/ChocolArm64/Instruction/AInstEmitSimdArithmetic.cs
+++ b/ChocolArm64/Instruction/AInstEmitSimdArithmetic.cs
@@ -335,6 +335,15 @@ namespace ChocolArm64.Instruction
             });
         }
 
+        public static void Mla_Ve(AILEmitterCtx Context)
+        {
+            EmitVectorTernaryOpByElemZx(Context, () =>
+            {
+                Context.Emit(OpCodes.Mul);
+                Context.Emit(OpCodes.Add);
+            });
+        }
+
         public static void Mls_V(AILEmitterCtx Context)
         {
             EmitVectorTernaryOpZx(Context, () =>
diff --git a/ChocolArm64/Instruction/AInstEmitSimdHelper.cs b/ChocolArm64/Instruction/AInstEmitSimdHelper.cs
index 4e45a11d..d8642e99 100644
--- a/ChocolArm64/Instruction/AInstEmitSimdHelper.cs
+++ b/ChocolArm64/Instruction/AInstEmitSimdHelper.cs
@@ -381,13 +381,16 @@ namespace ChocolArm64.Instruction
                 }
 
                 EmitVectorExtract(Context, Op.Rn, Index, Op.Size, Signed);
-                EmitVectorExtract(Context, Op.Rm, Index, Op.Size, Signed);
+                EmitVectorExtract(Context, Op.Rm, Elem,  Op.Size, Signed);
 
                 Emit();
 
-                EmitVectorInsert(Context, Op.Rd, Index, Op.Size);
+                EmitVectorInsertTmp(Context, Index, Op.Size);
             }
 
+            Context.EmitLdvectmp();
+            Context.EmitStvec(Op.Rd);
+
             if (Op.RegisterSize == ARegisterSize.SIMD64)
             {
                 EmitVectorZeroUpper(Context, Op.Rd);