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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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171
ARMeilleure/CodeGen/X86/CodeGenerator.cs
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@ -33,24 +33,14 @@ namespace ARMeilleure.CodeGen.X86
Add(Instruction.BitwiseNot, GenerateBitwiseNot);
Add(Instruction.BitwiseOr, GenerateBitwiseOr);
Add(Instruction.Branch, GenerateBranch);
Add(Instruction.BranchIfFalse, GenerateBranchIfFalse);
Add(Instruction.BranchIfTrue, GenerateBranchIfTrue);
Add(Instruction.BranchIf, GenerateBranchIf);
Add(Instruction.ByteSwap, GenerateByteSwap);
Add(Instruction.Call, GenerateCall);
Add(Instruction.Clobber, GenerateClobber);
Add(Instruction.Compare, GenerateCompare);
Add(Instruction.CompareAndSwap, GenerateCompareAndSwap);
Add(Instruction.CompareAndSwap16, GenerateCompareAndSwap16);
Add(Instruction.CompareAndSwap8, GenerateCompareAndSwap8);
Add(Instruction.CompareEqual, GenerateCompareEqual);
Add(Instruction.CompareGreater, GenerateCompareGreater);
Add(Instruction.CompareGreaterOrEqual, GenerateCompareGreaterOrEqual);
Add(Instruction.CompareGreaterOrEqualUI, GenerateCompareGreaterOrEqualUI);
Add(Instruction.CompareGreaterUI, GenerateCompareGreaterUI);
Add(Instruction.CompareLess, GenerateCompareLess);
Add(Instruction.CompareLessOrEqual, GenerateCompareLessOrEqual);
Add(Instruction.CompareLessOrEqualUI, GenerateCompareLessOrEqualUI);
Add(Instruction.CompareLessUI, GenerateCompareLessUI);
Add(Instruction.CompareNotEqual, GenerateCompareNotEqual);
Add(Instruction.ConditionalSelect, GenerateConditionalSelect);
Add(Instruction.ConvertI64ToI32, GenerateConvertI64ToI32);
Add(Instruction.ConvertToFP, GenerateConvertToFP);
@ -474,6 +464,8 @@ namespace ARMeilleure.CodeGen.X86
Debug.Assert(dest.Type.IsInteger());
// Note: GenerateCompareCommon makes the assumption that BitwiseAnd will emit only a single `and`
// instruction.
context.Assembler.And(dest, src2, dest.Type);
}
@ -525,22 +517,17 @@ namespace ARMeilleure.CodeGen.X86
context.JumpTo(context.CurrBlock.Branch);
}
private static void GenerateBranchIfFalse(CodeGenContext context, Operation operation)
private static void GenerateBranchIf(CodeGenContext context, Operation operation)
{
Operand source = operation.GetSource(0);
Operand comp = operation.GetSource(2);
context.Assembler.Test(source, source, source.Type);
Debug.Assert(comp.Kind == OperandKind.Constant);
context.JumpTo(X86Condition.Equal, context.CurrBlock.Branch);
}
var cond = ((Comparison)comp.AsInt32()).ToX86Condition();
private static void GenerateBranchIfTrue(CodeGenContext context, Operation operation)
{
Operand source = operation.GetSource(0);
GenerateCompareCommon(context, operation);
context.Assembler.Test(source, source, source.Type);
context.JumpTo(X86Condition.NotEqual, context.CurrBlock.Branch);
context.JumpTo(cond, context.CurrBlock.Branch);
}
private static void GenerateByteSwap(CodeGenContext context, Operation operation)
@ -566,6 +553,60 @@ namespace ARMeilleure.CodeGen.X86
// register allocator, we don't need to produce any code.
}
private static void GenerateCompare(CodeGenContext context, Operation operation)
{
Operand dest = operation.Destination;
Operand comp = operation.GetSource(2);
Debug.Assert(dest.Type == OperandType.I32);
Debug.Assert(comp.Kind == OperandKind.Constant);
var cond = ((Comparison)comp.AsInt32()).ToX86Condition();
GenerateCompareCommon(context, operation);
context.Assembler.Setcc(dest, cond);
context.Assembler.Movzx8(dest, dest, OperandType.I32);
}
private static void GenerateCompareCommon(CodeGenContext context, Operation operation)
{
Operand src1 = operation.GetSource(0);
Operand src2 = operation.GetSource(1);
EnsureSameType(src1, src2);
Debug.Assert(src1.Type.IsInteger());
if (src2.Kind == OperandKind.Constant && src2.Value == 0)
{
if (MatchOperation(operation.ListPrevious, Instruction.BitwiseAnd, src1.Type, src1.GetRegister()))
{
// Since the `test` and `and` instruction set the status flags in the same way, we can omit the
// `test r,r` instruction when it is immediately preceded by an `and r,*` instruction.
//
// For example:
//
// and eax, 0x3
// test eax, eax
// jz .L0
//
// =>
//
// and eax, 0x3
// jz .L0
}
else
{
context.Assembler.Test(src1, src1, src1.Type);
}
}
else
{
context.Assembler.Cmp(src1, src2, src1.Type);
}
}
private static void GenerateCompareAndSwap(CodeGenContext context, Operation operation)
{
Operand src1 = operation.GetSource(0);
@ -615,71 +656,6 @@ namespace ARMeilleure.CodeGen.X86
context.Assembler.Cmpxchg8(memOp, src3);
}
private static void GenerateCompareEqual(CodeGenContext context, Operation operation)
{
GenerateCompare(context, operation, X86Condition.Equal);
}
private static void GenerateCompareGreater(CodeGenContext context, Operation operation)
{
GenerateCompare(context, operation, X86Condition.Greater);
}
private static void GenerateCompareGreaterOrEqual(CodeGenContext context, Operation operation)
{
GenerateCompare(context, operation, X86Condition.GreaterOrEqual);
}
private static void GenerateCompareGreaterOrEqualUI(CodeGenContext context, Operation operation)
{
GenerateCompare(context, operation, X86Condition.AboveOrEqual);
}
private static void GenerateCompareGreaterUI(CodeGenContext context, Operation operation)
{
GenerateCompare(context, operation, X86Condition.Above);
}
private static void GenerateCompareLess(CodeGenContext context, Operation operation)
{
GenerateCompare(context, operation, X86Condition.Less);
}
private static void GenerateCompareLessOrEqual(CodeGenContext context, Operation operation)
{
GenerateCompare(context, operation, X86Condition.LessOrEqual);
}
private static void GenerateCompareLessOrEqualUI(CodeGenContext context, Operation operation)
{
GenerateCompare(context, operation, X86Condition.BelowOrEqual);
}
private static void GenerateCompareLessUI(CodeGenContext context, Operation operation)
{
GenerateCompare(context, operation, X86Condition.Below);
}
private static void GenerateCompareNotEqual(CodeGenContext context, Operation operation)
{
GenerateCompare(context, operation, X86Condition.NotEqual);
}
private static void GenerateCompare(CodeGenContext context, Operation operation, X86Condition condition)
{
Operand dest = operation.Destination;
Operand src1 = operation.GetSource(0);
Operand src2 = operation.GetSource(1);
EnsureSameType(src1, src2);
Debug.Assert(dest.Type == OperandType.I32);
context.Assembler.Cmp(src1, src2, src1.Type);
context.Assembler.Setcc(dest, condition);
context.Assembler.Movzx8(dest, dest, OperandType.I32);
}
private static void GenerateConditionalSelect(CodeGenContext context, Operation operation)
{
Operand dest = operation.Destination;
@ -1561,6 +1537,25 @@ namespace ARMeilleure.CodeGen.X86
context.Assembler.Pshufd(dest, dest, 0xfc);
}
private static bool MatchOperation(Node node, Instruction inst, OperandType destType, Register destReg)
{
if (!(node is Operation operation) || node.DestinationsCount == 0)
{
return false;
}
if (operation.Instruction != inst)
{
return false;
}
Operand dest = operation.Destination;
return dest.Kind == OperandKind.Register &&
dest.Type == destType &&
dest.GetRegister() == destReg;
}
[Conditional("DEBUG")]
private static void ValidateUnOp(Operand dest, Operand source)
{