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String.StartsWith ordinal optimization #1632

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Sep 29, 2015
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String.StartsWith ordinal optimization #1632

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6 changes: 4 additions & 2 deletions src/mscorlib/src/System/String.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -2556,10 +2556,12 @@ public Boolean StartsWith(String value, StringComparison comparisonType) {
return CultureInfo.InvariantCulture.CompareInfo.IsPrefix(this, value, CompareOptions.IgnoreCase);

case StringComparison.Ordinal:
if( this.Length < value.Length) {
if( this.Length < value.Length || m_firstChar != value.m_firstChar) {
return false;
}
return (nativeCompareOrdinalEx(this, 0, value, 0, value.Length) == 0);
return (value.Length == 1) ?
true : // First char is the same and thats all there is to compare
(nativeCompareOrdinalEx(this, 0, value, 0, value.Length) == 0);

case StringComparison.OrdinalIgnoreCase:
if( this.Length < value.Length) {
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