Add a missing bitcast. This code used to only handle conversions between

i64 and f64 types, but now it also handle Neon vector types, so the f64 result
of VMOVDRR may need to be converted to a Neon type.  Radar 8084742.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105845 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index f9a34e0e570fc85dc9cb5919bf0fed58d0d214c5..00da962a8f264ee859dd6bd6d9ed395f3fe2f25b 100644 (file)
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -2447,7 +2447,8 @@ static SDValue ExpandBIT_CONVERT(SDNode *N, SelectionDAG &DAG) {
                              DAG.getConstant(0, MVT::i32));
     SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op,
                              DAG.getConstant(1, MVT::i32));
-    return DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi);
+    return DAG.getNode(ISD::BIT_CONVERT, dl, DstVT,
+                       DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi));
   }
 
   // Turn f64->i64 into VMOVRRD.

diff --git a/test/CodeGen/ARM/2010-06-11-vmovdrr-bitcast.ll b/test/CodeGen/ARM/2010-06-11-vmovdrr-bitcast.ll
new file mode 100644 (file)
index 0000000..7519ca7
--- /dev/null
+++ b/test/CodeGen/ARM/2010-06-11-vmovdrr-bitcast.ll
@@ -0,0 +1,19 @@
+; RUN: llc < %s -march=arm -mattr=+neon
+; Radar 8084742
+
+%struct.__int8x8x2_t = type { [2 x <8 x i8>] }
+
+define arm_apcscc void @foo(%struct.__int8x8x2_t* nocapture %a, i8* %b) nounwind {
+entry:
+ %0 = bitcast %struct.__int8x8x2_t* %a to i128*  ; <i128*> [#uses=1]
+ %srcval = load i128* %0, align 8                ; <i128> [#uses=2]
+ %tmp6 = trunc i128 %srcval to i64               ; <i64> [#uses=1]
+ %tmp8 = lshr i128 %srcval, 64                   ; <i128> [#uses=1]
+ %tmp9 = trunc i128 %tmp8 to i64                 ; <i64> [#uses=1]
+ %tmp16.i = bitcast i64 %tmp6 to <8 x i8>        ; <<8 x i8>> [#uses=1]
+ %tmp20.i = bitcast i64 %tmp9 to <8 x i8>        ; <<8 x i8>> [#uses=1]
+ tail call void @llvm.arm.neon.vst2.v8i8(i8* %b, <8 x i8> %tmp16.i, <8 x i8> %tmp20.i) nounwind
+ ret void
+}
+
+declare void @llvm.arm.neon.vst2.v8i8(i8*, <8 x i8>, <8 x i8>) nounwind