diff options
| -rw-r--r-- | lib/Analysis/IVUsers.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/Analysis/IVUsers.cpp b/lib/Analysis/IVUsers.cpp index b80966b65a..0a6682a254 100644 --- a/lib/Analysis/IVUsers.cpp +++ b/lib/Analysis/IVUsers.cpp @@ -21,6 +21,7 @@ #include "llvm/Analysis/Dominators.h" #include "llvm/Analysis/LoopPass.h" #include "llvm/Analysis/ScalarEvolutionExpressions.h" +#include "llvm/Analysis/ValueTracking.h" #include "llvm/Target/TargetData.h" #include "llvm/Assembly/Writer.h" #include "llvm/ADT/STLExtras.h" @@ -120,6 +121,12 @@ bool IVUsers::AddUsersImpl(Instruction *I, if (!SE->isSCEVable(I->getType())) return false; // Void and FP expressions cannot be reduced. + // IVUsers is used by LSR which assumes that all SCEV expressions are safe to + // pass to SCEVExpander. Expressions are not safe to expand if they represent + // operations that are not safe to speculate, namely integer division. + if (!isa<PHINode>(I) && !isSafeToSpeculativelyExecute(I, TD)) + return false; + // LSR is not APInt clean, do not touch integers bigger than 64-bits. // Also avoid creating IVs of non-native types. For example, we don't want a // 64-bit IV in 32-bit code just because the loop has one 64-bit cast. |