Optimization | Modify Add (Integer) Instruction to use LEA instead. (#1971)

* Optimization | Modify Add Instruction to use LEA instead.

Currently, the add instruction requires 4 registers to take place. By using LEA, we can effectively perform the same working using 3 registers, reducing memory spills and improving translation efficiency.

* Fix IsSameOperandDestSrc1 Check for Add

* Use LEA if Dest != SRC1

* Update IsSameOperandDestSrc1 to account for Cases where Dest and Src1 can be same for add

* Fix error in logic

* Typo

* Add paranthesis for clarity

* Compare registers as requested.

* Cleanup if statement, use same comparison method as generateCopy

* Make change as recommended by gdk

* Perform check only when Add calls are made

* use ensure sametype for lea, fix else

* Update comment

* Update version #

1 files changed, 1 insertions, 0 deletions

diff --git a/ARMeilleure/CodeGen/X86/PreAllocator.cs b/ARMeilleure/CodeGen/X86/PreAllocator.cs
index 55bc778b..cb2476b4 100644
--- a/ARMeilleure/CodeGen/X86/PreAllocator.cs
+++ b/ARMeilleure/CodeGen/X86/PreAllocator.cs
@@ -1273,6 +1273,7 @@ namespace ARMeilleure.CodeGen.X86
             switch (operation.Instruction)
             {
                 case Instruction.Add:
+                    return !HardwareCapabilities.SupportsVexEncoding && !operation.Destination.Type.IsInteger();
                 case Instruction.Multiply:
                 case Instruction.Subtract:
                     return !HardwareCapabilities.SupportsVexEncoding || operation.Destination.Type.IsInteger();