}
// Only cast if the size is the same
- if (Src.getValueType().getSizeInBits() != VT.getSizeInBits())
+ if (!Src || Src.getValueType().getSizeInBits() != VT.getSizeInBits())
return SDValue();
return DAG.getBitcast(VT, Src);
--- /dev/null
+; RUN: llc -march=amdgcn < %s | FileCheck %s
+; RUN: llc -march=amdgcn -mcpu=tonga < %s | FileCheck %s
+; RUN: llc -march=amdgcn -mcpu=gfx900 < %s | FileCheck %s
+
+; Checks that we don't crash when code produces a build_vector with two undef operands.
+
+; CHECK: {{^}}buildvector_undefs:
+define amdgpu_kernel void @buildvector_undefs(<2 x i16> %in) {
+entry:
+ %i0 = call <16 x i16> @llvm.vector.insert.v16i16.v2i16(<16 x i16> poison, <2 x i16> %in, i64 0)
+ %i1 = call <16 x i16> @llvm.vector.insert.v16i16.v2i16(<16 x i16> %i0, <2 x i16> zeroinitializer, i64 2)
+ store <16 x i16> %i1, ptr addrspace(1) null, align 32
+ ret void
+}
+
+declare <2 x i16> @llvm.vector.extract.v2i16.v16i16(<16 x i16>, i64 immarg)
+declare <16 x i16> @llvm.vector.insert.v16i16.v2i16(<16 x i16>, <2 x i16>, i64 immarg)