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8222484: Specialize generation of simple String concatenation expressions

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Reviewed-by: jrose, jlaskey
This commit is contained in:
Claes Redestad 2019-04-17 00:06:38 +02:00
parent 7d9e7e1e0b
commit 781fb29580
5 changed files with 177 additions and 96 deletions
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15
src/java.base/share/classes/java/lang/String.java
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@ -1965,20 +1965,7 @@ public final class String
if (str.isEmpty()) {
return this;
}
if (coder() == str.coder()) {
byte[] val = this.value;
byte[] oval = str.value;
int len = val.length + oval.length;
byte[] buf = Arrays.copyOf(val, len);
System.arraycopy(oval, 0, buf, val.length, oval.length);
return new String(buf, coder);
}
int len = length();
int olen = str.length();
byte[] buf = StringUTF16.newBytesFor(len + olen);
getBytes(buf, 0, UTF16);
str.getBytes(buf, len, UTF16);
return new String(buf, UTF16);
return StringConcatHelper.simpleConcat(this, str);
}
/**