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Improve branch operations (#1442)

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* Add Compare instruction

* Add BranchIf instruction

* Use test when BranchIf & Compare against 0

* Propagate Compare into BranchIfTrue/False use

- Propagate Compare operations into their BranchIfTrue/False use and
  turn these into a BranchIf.

- Clean up Comparison enum.

* Replace BranchIfTrue/False with BranchIf

* Use BranchIf in EmitPtPointerLoad

- Using BranchIf early instead of BranchIfTrue/False improves LCQ and
  reduces the amount of work needed by the Optimizer.

  EmitPtPointerLoader was a/the big producer of BranchIfTrue/False.

- Fix asserts firing when assembling BitwiseAnd because of type
  mismatch in EmitStoreExclusive. This is harmless and should not
  cause any diffs.

* Increment PPTC interval version

* Improve IRDumper for BranchIf & Compare

* Use BranchIf in EmitNativeCall

* Clean up

* Do not emit test when immediately preceded by and
This commit is contained in:
Ficture Seven 2020-08-05 02:52:33 +04:00 • committed by GitHub
parent a33dc2f491
commit ee22517d92
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12 changed files with 311 additions and 145 deletions
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32
ARMeilleure/CodeGen/X86/PreAllocator.cs
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@ -154,7 +154,7 @@ namespace ARMeilleure.CodeGen.X86
// -- Doing so may allow us to encode the constant as operand 2 and avoid a copy.
// - If the constant is on operand 2, we check if the instruction supports it,
// if not, we also add a copy. 64-bits constants are usually not supported.
if (IsCommutative(inst))
if (IsCommutative(operation))
{
src2 = operation.GetSource(1);
@ -1348,16 +1348,8 @@ namespace ARMeilleure.CodeGen.X86
case Instruction.BitwiseAnd:
case Instruction.BitwiseExclusiveOr:
case Instruction.BitwiseOr:
case Instruction.CompareEqual:
case Instruction.CompareGreater:
case Instruction.CompareGreaterOrEqual:
case Instruction.CompareGreaterOrEqualUI:
case Instruction.CompareGreaterUI:
case Instruction.CompareLess:
case Instruction.CompareLessOrEqual:
case Instruction.CompareLessOrEqualUI:
case Instruction.CompareLessUI:
case Instruction.CompareNotEqual:
case Instruction.BranchIf:
case Instruction.Compare:
case Instruction.Multiply:
case Instruction.RotateRight:
case Instruction.ShiftLeft:
@ -1376,18 +1368,28 @@ namespace ARMeilleure.CodeGen.X86
return false;
}
private static bool IsCommutative(Instruction inst)
private static bool IsCommutative(Operation operation)
{
switch (inst)
switch (operation.Instruction)
{
case Instruction.Add:
case Instruction.BitwiseAnd:
case Instruction.BitwiseExclusiveOr:
case Instruction.BitwiseOr:
case Instruction.CompareEqual:
case Instruction.CompareNotEqual:
case Instruction.Multiply:
return true;
case Instruction.BranchIf:
case Instruction.Compare:
{
Operand comp = operation.GetSource(2);
Debug.Assert(comp.Kind == OperandKind.Constant);
var compType = (Comparison)comp.AsInt32();
return compType == Comparison.Equal || compType == Comparison.NotEqual;
}
}
return false;