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AsmMatcherEmitter: Use stable_sort when reordering instructions, so that order

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is still deterministic even amongst ambiguous instructions (eventually ambiguous
match orders will be a hard error, but we aren't there yet).

llvm-svn: 95157
This commit is contained in:
Daniel Dunbar 2010-02-02 23:46:36 +00:00
parent 62ba09bb47
commit 9b2879bd70
1 changed files with 5 additions and 3 deletions
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8
utils/TableGen/AsmMatcherEmitter.cpp
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@ -1413,9 +1413,11 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
AsmMatcherInfo Info(AsmParser);
Info.BuildInfo(Target);
// Sort the instruction table using the partial order on classes.
std::sort(Info.Instructions.begin(), Info.Instructions.end(),
less_ptr<InstructionInfo>());
// Sort the instruction table using the partial order on classes. We use
// stable_sort to ensure that ambiguous instructions are still
// deterministically ordered.
std::stable_sort(Info.Instructions.begin(), Info.Instructions.end(),
less_ptr<InstructionInfo>());
DEBUG_WITH_TYPE("instruction_info", {
for (std::vector<InstructionInfo*>::iterator