diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Analysis/IVDescriptors.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/IVDescriptors.cpp b/llvm/lib/Analysis/IVDescriptors.cpp index ce99226087f..3c33aa973cd 100644 --- a/llvm/lib/Analysis/IVDescriptors.cpp +++ b/llvm/lib/Analysis/IVDescriptors.cpp @@ -721,6 +721,13 @@ bool RecurrenceDescriptor::isFirstOrderRecurrence( if (I->getParent()->getTerminator() == I) return false; + // Do not try to sink an instruction multiple times (if multiple operands + // are first order recurrences). + // TODO: We can support this case, by sinking the instruction after the + // 'deepest' previous instruction. + if (SinkAfter.find(I) != SinkAfter.end()) + return false; + if (DT->dominates(Previous, I)) // We already are good w/o sinking. return true; |
