diff options
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp index 23dbe59087e..0625d8deca0 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp @@ -1460,11 +1460,16 @@ Instruction *InstCombiner::commonPointerCastTransforms(CastInst &CI) { APInt Offset(OffsetBits, 0); BitCastInst *BCI = dyn_cast<BitCastInst>(GEP->getOperand(0)); if (GEP->hasOneUse() && BCI && GEP->accumulateConstantOffset(DL, Offset)) { + // FIXME: This is insufficiently tested - just a no-crash test + // (test/Transforms/InstCombine/2007-05-14-Crash.ll) + // // Get the base pointer input of the bitcast, and the type it points to. Value *OrigBase = BCI->getOperand(0); SmallVector<Value*, 8> NewIndices; if (FindElementAtOffset(OrigBase->getType(), Offset.getSExtValue(), NewIndices)) { + // FIXME: This codepath is completely untested - could be unreachable + // for all I know. // If we were able to index down into an element, create the GEP // and bitcast the result. This eliminates one bitcast, potentially // two. |
