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Relax block ordering constraints (#1535)

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* Relax block ordering constraints

Before `block.Next` had to follow `block.ListNext`, now it does not.
Instead `CodeGenerator` will now emit the necessary jump instructions
to ensure control flow.

This makes control flow and block order modifications easier. It also
eliminates some simple cases of redundant branches.

* Set PPTC version
This commit is contained in:
FICTURE7 2020-09-12 19:32:53 +04:00 • committed by GitHub
parent 3d055da5fc
commit 36ec1bc6c0
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GPG key ID: 4AEE18F83AFDEB23
11 changed files with 164 additions and 174 deletions
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13
ARMeilleure/CodeGen/RegisterAllocators/HybridAllocator.cs
View file

@ -427,18 +427,5 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
{
return local.Assignments.Count + local.Uses.Count;
}
private static IEnumerable<BasicBlock> Successors(BasicBlock block)
{
if (block.Next != null)
{
yield return block.Next;
}
if (block.Branch != null)
{
yield return block.Branch;
}
}
}
}

25
ARMeilleure/CodeGen/RegisterAllocators/LinearScanAllocator.cs
View file

@ -626,16 +626,11 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
continue;
}
bool hasSingleOrNoSuccessor = block.Next == null || block.Branch == null;
bool hasSingleOrNoSuccessor = block.SuccessorCount <= 1;
for (int i = 0; i < 2; i++)
for (int i = 0; i < block.SuccessorCount; i++)
{
// This used to use an enumerable, but it ended up generating a lot of garbage, so now it is a loop.
BasicBlock successor = (i == 0) ? block.Next : block.Branch;
if (successor == null)
{
continue;
}
BasicBlock successor = block.GetSuccessor(i);
int succIndex = successor.Index;
@ -643,7 +638,7 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
// (the successor before the split) should be right after it.
if (IsSplitEdgeBlock(successor))
{
succIndex = FirstSuccessor(successor).Index;
succIndex = successor.GetSuccessor(0).Index;
}
CopyResolver copyResolver = new CopyResolver();
@ -883,10 +878,11 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
BitMap liveOut = blkLiveOut[block.Index];
if ((block.Next != null && liveOut.Set(blkLiveIn[block.Next.Index])) ||
(block.Branch != null && liveOut.Set(blkLiveIn[block.Branch.Index])))
for (int i = 0; i < block.SuccessorCount; i++)
{
modified = true;
BasicBlock succ = block.GetSuccessor(i);
modified |= liveOut.Set(blkLiveIn[succ.Index]);
}
BitMap liveIn = blkLiveIn[block.Index];
@ -1002,11 +998,6 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
return (register.Index << 1) | (register.Type == RegisterType.Vector ? 1 : 0);
}
private static BasicBlock FirstSuccessor(BasicBlock block)
{
return block.Next ?? block.Branch;
}
private static IEnumerable<Node> BottomOperations(BasicBlock block)
{
Node node = block.Operations.Last;

25
ARMeilleure/CodeGen/X86/CodeGenerator.cs
View file

@ -32,7 +32,6 @@ namespace ARMeilleure.CodeGen.X86
Add(Instruction.BitwiseExclusiveOr, GenerateBitwiseExclusiveOr);
Add(Instruction.BitwiseNot, GenerateBitwiseNot);
Add(Instruction.BitwiseOr, GenerateBitwiseOr);
Add(Instruction.Branch, GenerateBranch);
Add(Instruction.BranchIf, GenerateBranchIf);
Add(Instruction.ByteSwap, GenerateByteSwap);
Add(Instruction.Call, GenerateCall);
@ -168,6 +167,23 @@ namespace ARMeilleure.CodeGen.X86
GenerateOperation(context, operation);
}
}
if (block.SuccessorCount == 0)
{
// The only blocks which can have 0 successors are exit blocks.
Debug.Assert(block.Operations.Last is Operation operation &&
(operation.Instruction == Instruction.Tailcall ||
operation.Instruction == Instruction.Return));
}
else
{
BasicBlock succ = block.GetSuccessor(0);
if (succ != block.ListNext)
{
context.JumpTo(succ);
}
}
}
Logger.EndPass(PassName.CodeGeneration);
@ -512,11 +528,6 @@ namespace ARMeilleure.CodeGen.X86
context.Assembler.Or(dest, src2, dest.Type);
}
private static void GenerateBranch(CodeGenContext context, Operation operation)
{
context.JumpTo(context.CurrBlock.Branch);
}
private static void GenerateBranchIf(CodeGenContext context, Operation operation)
{
Operand comp = operation.GetSource(2);
@ -527,7 +538,7 @@ namespace ARMeilleure.CodeGen.X86
GenerateCompareCommon(context, operation);
context.JumpTo(cond, context.CurrBlock.Branch);
context.JumpTo(cond, context.CurrBlock.GetSuccessor(1));
}
private static void GenerateByteSwap(CodeGenContext context, Operation operation)