NEON does not support truncating vector stores. Radar 8598391.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117940 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 14 insertions, 0 deletions

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index d086093597..6503960de9 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -104,6 +104,10 @@ void ARMTargetLowering::addTypeForNEON(EVT VT, EVT PromotedLdStVT,
     setOperationAction(ISD::SRL, VT.getSimpleVT(), Custom);
     setLoadExtAction(ISD::SEXTLOAD, VT.getSimpleVT(), Expand);
     setLoadExtAction(ISD::ZEXTLOAD, VT.getSimpleVT(), Expand);
+    for (unsigned InnerVT = (unsigned)MVT::FIRST_VECTOR_VALUETYPE;
+         InnerVT <= (unsigned)MVT::LAST_VECTOR_VALUETYPE; ++InnerVT)
+      setTruncStoreAction(VT.getSimpleVT(),
+                          (MVT::SimpleValueType)InnerVT, Expand);
   }
   setLoadExtAction(ISD::EXTLOAD, VT.getSimpleVT(), Expand);
 
diff --git a/test/CodeGen/ARM/vmov.ll b/test/CodeGen/ARM/vmov.ll
index 4d654d771f..a86be32bd2 100644
--- a/test/CodeGen/ARM/vmov.ll
+++ b/test/CodeGen/ARM/vmov.ll
@@ -343,3 +343,13 @@ declare <2 x i32> @llvm.arm.neon.vqmovnu.v2i32(<2 x i64>) nounwind readnone
 declare <8 x i8>  @llvm.arm.neon.vqmovnsu.v8i8(<8 x i16>) nounwind readnone
 declare <4 x i16> @llvm.arm.neon.vqmovnsu.v4i16(<4 x i32>) nounwind readnone
 declare <2 x i32> @llvm.arm.neon.vqmovnsu.v2i32(<2 x i64>) nounwind readnone
+
+; Truncating vector stores are not supported.  The following should not crash.
+; Radar 8598391.
+define void @noTruncStore(<4 x i32>* %a, <4 x i16>* %b) nounwind {
+;CHECK: vmovn
+  %tmp1 = load <4 x i32>* %a, align 16
+  %tmp2 = trunc <4 x i32> %tmp1 to <4 x i16>
+  store <4 x i16> %tmp2, <4 x i16>* %b, align 8
+  ret void
+}