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Allow LocalVariable to be assigned more than once (#2288)

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* Allow `LocalVariable` to be assigned more than once

This allows us to write flow controls like loops and if-elses with
LocalVariables participating in phi nodes.

* Add `GetLocalNumber` to operand
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FICTURE7 2021-05-17 03:54:53 +04:00 • committed by GitHub
parent 212e472c9f
commit c805542b29
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6 changed files with 47 additions and 16 deletions
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10
ARMeilleure/Translation/SsaConstruction.cs
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@ -45,7 +45,7 @@ namespace ARMeilleure.Translation
public static void Construct(ControlFlowGraph cfg)
{
var globalDefs = new DefMap[cfg.Blocks.Count];
var localDefs = new Operand[RegisterConsts.TotalCount];
var localDefs = new Operand[cfg.LocalsCount + RegisterConsts.TotalCount];
var dfPhiBlocks = new Queue<BasicBlock>();
@ -264,6 +264,12 @@ namespace ARMeilleure.Translation
return true;
}
else if (operand is { Kind: OperandKind.LocalVariable } && operand.GetLocalNumber() > 0)
{
result = RegisterConsts.TotalCount + operand.GetLocalNumber() - 1;
return true;
}
result = -1;
@ -274,7 +280,7 @@ namespace ARMeilleure.Translation
{
if (!TryGetId(operand, out int key))
{
Debug.Fail("OperandKind must be Register.");
Debug.Fail("OperandKind must be Register or a numbered LocalVariable.");
}
return key;