diff options
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 6 | ||||
| -rw-r--r-- | test/CodeGen/X86/2013-05-06-ConactVectorCrash.ll | 14 |
2 files changed, 20 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 85f5df911d..2e09ec08fd 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -9145,6 +9145,12 @@ SDValue DAGCombiner::visitCONCAT_VECTORS(SDNode *N) { return SDValue(); } else { SingleSource = Op.getOperand(0); + + // Check the source type is the same as the type of the result. + // If not, this concat may extend the vector, so we can not + // optimize it away. + if (SingleSource.getValueType() != N->getValueType(0)) + return SDValue(); } unsigned IdentityIndex = i * PartNumElem; diff --git a/test/CodeGen/X86/2013-05-06-ConactVectorCrash.ll b/test/CodeGen/X86/2013-05-06-ConactVectorCrash.ll new file mode 100644 index 0000000000..920341799d --- /dev/null +++ b/test/CodeGen/X86/2013-05-06-ConactVectorCrash.ll @@ -0,0 +1,14 @@ +; RUN: llc < %s -march=x86 + +; Make sure this doesn't crash + +target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" +target triple = "x86_64-pc-win32" + +define void @foo() { + %1 = shufflevector <3 x i8> undef, <3 x i8> undef, <2 x i32> <i32 0, i32 1> + %2 = shufflevector <2 x i8> %1, <2 x i8> undef, <4 x i32> <i32 0, i32 1, i32 undef, i32 undef> + %3 = shufflevector <4 x i8> undef, <4 x i8> %2, <4 x i32> <i32 0, i32 1, i32 4, i32 5> + store <4 x i8> %3, <4 x i8>* undef + ret void +} |