diff options
Diffstat (limited to 'llvm/utils/TableGen/CodeGenDAGPatterns.cpp')
| -rw-r--r-- | llvm/utils/TableGen/CodeGenDAGPatterns.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp index 703cd51..0ea90d7 100644 --- a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp +++ b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp @@ -2918,8 +2918,15 @@ static bool SimplifyTree(TreePatternNodePtr &N) { // If we have a bitconvert with a resolved type and if the source and // destination types are the same, then the bitconvert is useless, remove it. + // + // We make an exception if the types are completely empty. This can come up + // when the pattern being simplified is in the Fragments list of a PatFrags, + // so that the operand is just an untyped "node". In that situation we leave + // bitconverts unsimplified, and simplify them later once the fragment is + // expanded into its true context. if (N->getOperator()->getName() == "bitconvert" && N->getExtType(0).isValueTypeByHwMode(false) && + !N->getExtType(0).empty() && N->getExtType(0) == N->getChild(0)->getExtType(0) && N->getName().empty()) { N = N->getChildShared(0); |