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re PR libgcj/21753 (String.substring sharing heuristic should be improved)

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PR libgcj/21753:
	* java/lang/natString.cc (substring): Changed sharing heuristic.

From-SVN: r100454
This commit is contained in:
Tom Tromey 2005-06-01 15:52:45 +00:00 • committed by Tom Tromey
parent 75fe7b2f40
commit 68d8b93454
2 changed files with 9 additions and 1 deletions
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5
libjava/java/lang/natString.cc
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@ -833,7 +833,10 @@ java::lang::String::substring (jint beginIndex, jint endIndex)
if (beginIndex == 0 && endIndex == count)
return this;
jint newCount = endIndex - beginIndex;
if (newCount <= 8) // Optimization, mainly for GC.
// For very small strings, just allocate a new one. For other
// substrings, allocate a new one unless the substring is over half
// of the original string.
if (newCount <= 8 || newCount < (count >> 1))
return JvNewString(JvGetStringChars(this) + beginIndex, newCount);
jstring s = new String();
s->data = data;