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[TableGen] Do not assume that the first variant is the original pattern

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The variant generation for commutative/associative patterns would simply
delete the first output from the list assuming that it was identical to
the original pattern. This does not have to be the case, and a legitimate
variant could actually be removed that way. 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305556 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Krzysztof Parzyszek 2017-06-16 13:44:34 +00:00
parent c86dcc6411
commit 773e19ab52
1 changed files with 1 additions and 3 deletions
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4
utils/TableGen/CodeGenDAGPatterns.cpp
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@ -3808,9 +3808,7 @@ void CodeGenDAGPatterns::GenerateVariants() {
DepVars);
assert(!Variants.empty() && "Must create at least original variant!");
Variants.erase(Variants.begin()); // Remove the original pattern.
if (Variants.empty()) // No variants for this pattern.
if (Variants.size() == 1) // No additional variants for this pattern.
continue;
DEBUG(errs() << "FOUND VARIANTS OF: ";