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Implement caller saved registers

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Hopefully this fixes linux tests runs. The heuristics may need to be
retuned.
This commit is contained in:
FICTURE7 2021-09-29 21:33:04 +04:00
parent 4c8753f484
commit c971abb9ec
1 changed files with 33 additions and 9 deletions
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42
ARMeilleure/CodeGen/RegisterAllocators/HybridAllocator.cs
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@ -206,12 +206,6 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
int intLocalFreeRegisters = intFreeRegisters & ~blkInfo.IntFixedRegisters;
int vecLocalFreeRegisters = vecFreeRegisters & ~blkInfo.VecFixedRegisters;
if (blkInfo.HasCall)
{
intLocalFreeRegisters &= ~regMasks.IntCallerSavedRegisters;
vecLocalFreeRegisters &= ~regMasks.VecCallerSavedRegisters;
}
int intActiveRegisters = 0;
int vecActiveRegisters = 0;
@ -245,9 +239,39 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
}
}
}
// If operation is call, spill caller saved registers.
else if (node.Instruction == Instruction.Call)
{
int intCallerSavedRegisters = regMasks.IntCallerSavedRegisters & intActiveRegisters;
int vecCallerSavedRegisters = regMasks.VecCallerSavedRegisters & vecActiveRegisters;
// If the operation is folded to a fill, no need ot inspect sources; since sources of fills are
// constant operands which does not require registers.
while (intCallerSavedRegisters != 0)
{
int reg = BitOperations.TrailingZeroCount(intCallerSavedRegisters);
SpillRegister(ref GetLocalInfo(intActive[reg]), node);
intActive[reg] = default;
intActiveRegisters &= ~(1 << reg);
intCurrActiveRegisters |= 1 << reg;
intCallerSavedRegisters &= ~(1 << reg);
}
while (vecCallerSavedRegisters != 0)
{
int reg = BitOperations.TrailingZeroCount(vecCallerSavedRegisters);
SpillRegister(ref GetLocalInfo(vecActive[reg]), node);
vecActive[reg] = default;
vecActiveRegisters &= ~(1 << reg);
vecCurrActiveRegisters |= 1 << reg;
vecCallerSavedRegisters &= ~(1 << reg);
}
}
// If the operation is folded to a fill, no need to inspect sources; since sources of fills are
// constant operands which do not require registers.
if (!folded)
{
foreach (ref Operand source in node.SourcesUnsafe)
@ -314,7 +338,7 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
if (info.UsesAllocated == info.Uses)
{
// If the local is not a block local, we have to spill it; otherwise this would cause
// issues when the local is used a in a loop.
// issues when the local is used in a loop.
if (!info.IsBlockLocal)
{
SpillRegister(ref info, node);