diff options
| -rw-r--r-- | lib/Transforms/Scalar/SROA.cpp | 2 | ||||
| -rw-r--r-- | test/Transforms/SROA/basictest.ll | 20 |
2 files changed, 22 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/SROA.cpp b/lib/Transforms/Scalar/SROA.cpp index b279389..ca76251 100644 --- a/lib/Transforms/Scalar/SROA.cpp +++ b/lib/Transforms/Scalar/SROA.cpp @@ -1786,6 +1786,8 @@ static Value *getNaturalGEPWithType(IRBuilder<> &IRB, const DataLayout &TD, ElementTy = SeqTy->getElementType(); Indices.push_back(IRB.getInt(APInt(TD.getPointerSizeInBits(), 0))); } else if (StructType *STy = dyn_cast<StructType>(ElementTy)) { + if (STy->element_begin() == STy->element_end()) + break; // Nothing left to descend into. ElementTy = *STy->element_begin(); Indices.push_back(IRB.getInt32(0)); } else { diff --git a/test/Transforms/SROA/basictest.ll b/test/Transforms/SROA/basictest.ll index 3089736..e7767ef 100644 --- a/test/Transforms/SROA/basictest.ll +++ b/test/Transforms/SROA/basictest.ll @@ -948,3 +948,23 @@ entry: ret double %ret ; CHECK: ret double %x } + +%PR14034.struct = type { { {} }, i32, %PR14034.list } +%PR14034.list = type { %PR14034.list*, %PR14034.list* } + +define void @PR14034() { +; This test case tries to form GEPs into the empty leading struct members, and +; subsequently crashed (under valgrind) before we fixed the PR. The important +; thing is to handle empty structs gracefully. +; CHECK: @PR14034 + +entry: + %a = alloca %PR14034.struct + %list = getelementptr %PR14034.struct* %a, i32 0, i32 2 + %prev = getelementptr %PR14034.list* %list, i32 0, i32 1 + store %PR14034.list* undef, %PR14034.list** %prev + %cast0 = bitcast %PR14034.struct* undef to i8* + %cast1 = bitcast %PR14034.struct* %a to i8* + call void @llvm.memcpy.p0i8.p0i8.i32(i8* %cast0, i8* %cast1, i32 12, i32 0, i1 false) + ret void +} |