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Vectorize RegexInterpreter opcode loops for Oneloop, Onerep, Notonerep, and MatchString #124628

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Merged
danmoseley merged 6 commits into from
Mar 20, 2026
Merged

Vectorize RegexInterpreter opcode loops for Oneloop, Onerep, Notonerep, and MatchString #124628

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8e0b5a0
Use vectorized IndexOfAnyExcept for Oneloop/Oneloopatomic in interpreter
danmoseley Feb 20, 2026
22e1768
Use vectorized ContainsAnyExcept for Onerep in interpreter
danmoseley Feb 20, 2026
1fe43b5
Use vectorized Contains for Notonerep in interpreter
danmoseley Feb 20, 2026
6d7b8c6
Use vectorized SequenceEqual for MatchString in interpreter
danmoseley Feb 20, 2026
5d9432d
Simplify MatchString: use StartsWith/EndsWith per review feedback
danmoseley Mar 19, 2026
9c1c8e2
Revert Oneloop/Onerep/Notonerep vectorization
danmoseley Mar 19, 2026
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31 changes: 7 additions & 24 deletions ...ies/System.Text.RegularExpressions/src/System/Text/RegularExpressions/RegexInterpreter.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -209,44 +209,27 @@ private char Forwardcharnext(ReadOnlySpan<char> inputSpan)

private bool MatchString(string str, ReadOnlySpan<char> inputSpan)
{
int c = str.Length;
int pos;

if (!_rightToLeft)
{
if (inputSpan.Length - runtextpos < c)
if (runtextpos > inputSpan.Length ||
!inputSpan.Slice(runtextpos).StartsWith(str.AsSpan()))
{
return false;
}

pos = runtextpos + c;
runtextpos += str.Length;
return true;
}
else
{
if (runtextpos < c)
if (!inputSpan.Slice(0, runtextpos).EndsWith(str.AsSpan()))
{
return false;
}

pos = runtextpos;
}

while (c != 0)
{
if (str[--c] != inputSpan[--pos])
{
return false;
}
runtextpos -= str.Length;
return true;
}

if (!_rightToLeft)
{
pos += str.Length;
}

runtextpos = pos;

return true;
}

private bool MatchRef(int index, int length, ReadOnlySpan<char> inputSpan, bool caseInsensitive)
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