InstCombine: Don't assume DataLayout is always available
We tried to get the result of DataLayout::getLargestLegalIntTypeSize but
we didn't have a DataLayout. This resulted in opt crashing.
This fixes PR21651.
llvm-svn: 222645
diff --git a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
index 292c206..5eee15f 100644
--- a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -2095,7 +2095,8 @@
// the largest legal integer type. We need to be conservative here since
// x86 generates redundant zero-extenstion instructions if the operand is
// truncated to i8 or i16.
- if (BitWidth > NewWidth && NewWidth >= DL->getLargestLegalIntTypeSize()) {
+ if (DL && BitWidth > NewWidth &&
+ NewWidth >= DL->getLargestLegalIntTypeSize()) {
IntegerType *Ty = IntegerType::get(SI.getContext(), NewWidth);
Builder->SetInsertPoint(&SI);
Value *NewCond = Builder->CreateTrunc(SI.getCondition(), Ty, "trunc");