[SROA] convertValue(): we can have <N x iK*> to <M x iQ> cast

Provided test case crashes otherwise.
Much like to the opposite case.

llvm/lib/Transforms/Scalar/SROA.cpp

@@ -1757,20 +1757,14 @@ static Value *convertValue(const DataLayout &DL, IRBuilderTy &IRB, Value *V,
                               NewTy);
   }
 
-  // See if we need ptrtoint for this type pair. A cast involving both scalars
-  // and vectors requires and additional bitcast.
+  // See if we need ptrtoint for this type pair. May require additional bitcast.
   if (OldTy->isPtrOrPtrVectorTy() && NewTy->isIntOrIntVectorTy()) {
     // Expand <2 x i8*> to i128 --> <2 x i8*> to <2 x i64> to i128
-    if (OldTy->isVectorTy() && !NewTy->isVectorTy())
-      return IRB.CreateBitCast(IRB.CreatePtrToInt(V, DL.getIntPtrType(OldTy)),
-                               NewTy);
-
     // Expand i8* to <2 x i32> --> i8* to i64 to <2 x i32>
-    if (!OldTy->isVectorTy() && NewTy->isVectorTy())
-      return IRB.CreateBitCast(IRB.CreatePtrToInt(V, DL.getIntPtrType(OldTy)),
-                               NewTy);
-
-    return IRB.CreatePtrToInt(V, NewTy);
+    // Expand <2 x i8*> to <4 x i32> --> <2 x i8*> to <2 x i64> to <4 x i32>
+    // Expand i8* to i64 --> i8* to i64 to i64
+    return IRB.CreateBitCast(IRB.CreatePtrToInt(V, DL.getIntPtrType(OldTy)),
+                             NewTy);
   }
 
   if (OldTy->isPtrOrPtrVectorTy() && NewTy->isPtrOrPtrVectorTy()) {

llvm/test/Transforms/SROA/vector-conversion.ll

@@ -70,3 +70,22 @@ define <2 x i8*> @vector_inttoptrbitcast_vector({<16 x i8>, <16 x i8>} %x) {
 
   ret <2 x i8*> %vec
 }
+
+define <16 x i8> @vector_ptrtointbitcast_vector({<2 x i8*>, <2 x i8*>} %x) {
+; CHECK-LABEL: @vector_ptrtointbitcast_vector(
+  %a = alloca {<2 x i8*>, <2 x i8*>}
+; CHECK-NOT: alloca
+
+  store {<2 x i8*>, <2 x i8*>} %x, {<2 x i8*>, <2 x i8*>}* %a
+; CHECK-NOT: store
+
+  %cast = bitcast {<2 x i8*>, <2 x i8*>}* %a to <16 x i8>*
+  %vec = load <16 x i8>, <16 x i8>* %cast
+; CHECK-NOT: load
+; CHECK: extractvalue
+; CHECK: ptrtoint
+; CHECK: bitcast
+; CHECK: extractvalue
+
+  ret <16 x i8> %vec
+}