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 #
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sharmander 2021-02-07 18:49:46 -05:00 committed by GitHub
parent 4047477866
commit 40797a1283
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3 changed files with 42 additions and 10 deletions

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@ -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();