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Change StringRef::startswith and StringRef::endswith to versions which are a

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bit more verbose, but optimize to much shorter code.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91817 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2009-12-21 06:49:24 +00:00
parent 65f067fa63
commit d5b1f8a842
2 changed files with 12 additions and 2 deletions
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6
include/llvm/ADT/StringRef.h
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@@ -159,12 +159,14 @@ namespace llvm {
/// startswith - Check if this string starts with the given \arg Prefix.
bool startswith(StringRef Prefix) const {
return substr(0, Prefix.Length).equals(Prefix);
return Length >= Prefix.Length &&
memcmp(Data, Prefix.Data, Prefix.Length) == 0;
}
/// endswith - Check if this string ends with the given \arg Suffix.
bool endswith(StringRef Suffix) const {
return slice(size() - Suffix.Length, size()).equals(Suffix);
return Length >= Suffix.Length &&
memcmp(end() - Suffix.Length, Suffix.Data, Suffix.Length) == 0;
}
/// @}