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Cache address scope resolution

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This commit is contained in:
Adrian Conlon 2024-06-08 23:38:29 +01:00
parent 494b1ab8ac
commit 889c632e1a
1 changed files with 6 additions and 3 deletions
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9
M6502/M6502.Symbols/Parser.cs
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@ -40,6 +40,9 @@
// Scope clarification
public List<Scope> AddressableScopes { get; } = [];
// Scope cache for precomputed ranges
private readonly int?[] _scopeAddressCache = new int?[0x10000];
#endregion
#region Lookups
@ -141,7 +144,7 @@
while (low <= high)
{
var mid = low + (high - low) / 2;
var mid = low + ((high - low) / 2);
var scope = this.AddressableScopes[mid];
@ -173,8 +176,8 @@
public Scope? LookupScope(int address)
{
var index = this.LocateScope(address);
return index == -1 ? null : this.AddressableScopes[index];
var index = _scopeAddressCache[address] ?? (_scopeAddressCache[address] = this.LocateScope(address));
return index == -1 ? null : this.AddressableScopes[index.Value];
}
#endregion