diff options
Diffstat (limited to 'llvm/lib/Analysis/LoopUnrollAnalyzer.cpp')
| -rw-r--r-- | llvm/lib/Analysis/LoopUnrollAnalyzer.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/LoopUnrollAnalyzer.cpp b/llvm/lib/Analysis/LoopUnrollAnalyzer.cpp index 8a97a9f9522..f9e02078501 100644 --- a/llvm/lib/Analysis/LoopUnrollAnalyzer.cpp +++ b/llvm/lib/Analysis/LoopUnrollAnalyzer.cpp @@ -141,6 +141,12 @@ bool UnrolledInstAnalyzer::visitCastInst(CastInst &I) { Constant *COp = dyn_cast<Constant>(I.getOperand(0)); if (!COp) COp = SimplifiedValues.lookup(I.getOperand(0)); + + // If we know a simplified value for this operand and cast is valid, save the + // result to SimplifiedValues. + // The cast can be invalid, because SimplifiedValues contains results of SCEV + // analysis, which operates on integers (and, e.g., might convert i8* null to + // i32 0). if (COp && CastInst::castIsValid(I.getOpcode(), COp, I.getType())) { if (Constant *C = ConstantExpr::getCast(I.getOpcode(), COp, I.getType())) { |
