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[TableGen] Use StringRef::compare instead of != and <. NFC.

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The previous code would always do 1 or 2 prefix compares;
explicitly only do one.

This speeds up debug -gen-asm-matcher by ~10% (e.g. X86: 40s -> 35s).

llvm-svn: 273583
This commit is contained in:
Ahmed Bougacha 2016-06-23 17:09:49 +00:00
parent 382cd268e3
commit 5c6db14ac7
1 changed files with 2 additions and 2 deletions
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4
utils/TableGen/AsmMatcherEmitter.cpp
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@ -579,8 +579,8 @@ struct MatchableInfo {
/// operator< - Compare two matchables.
bool operator<(const MatchableInfo &RHS) const {
// The primary comparator is the instruction mnemonic.
if (Mnemonic != RHS.Mnemonic)
return Mnemonic < RHS.Mnemonic;
if (int Cmp = Mnemonic.compare(RHS.Mnemonic))
return Cmp == -1;
if (AsmOperands.size() != RHS.AsmOperands.size())
return AsmOperands.size() < RHS.AsmOperands.size();