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Add tie-breaker for register class sorting in getSuperRegForSubReg

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llvm::stable_sort is apparently not sufficient.

Use the same tie-breaker/sorting style as TopoOrderRC fix bot failures.

E.g.

http://lab.llvm.org:8011/builders/llvm-clang-x86_64-expensive-checks-win/builds/19401/steps/test-check-all/logs/stdio

llvm-svn: 370267
This commit is contained in:
Jessica Paquette 2019-08-28 22:03:05 +00:00
parent 608a928360
commit 9c177a174f
1 changed files with 8 additions and 1 deletions
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9
utils/TableGen/CodeGenTarget.cpp
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@ -329,7 +329,14 @@ CodeGenTarget::getSuperRegForSubReg(const ValueTypeByHwMode &ValueTy,
// Find and return the largest of our candidate classes. // Find and return the largest of our candidate classes.
llvm::stable_sort(Candidates, [&](const CodeGenRegisterClass *A, llvm::stable_sort(Candidates, [&](const CodeGenRegisterClass *A,
const CodeGenRegisterClass *B) { const CodeGenRegisterClass *B) {
return A->getMembers().size() > B->getMembers().size(); if (A->getMembers().size() > B->getMembers().size())
return true;
if (A->getMembers().size() < B->getMembers().size())
return false;
// Order by name as a tie-breaker.
return StringRef(A->getName()) < B->getName();
}); });
return Candidates[0]; return Candidates[0];