From 21ef55ca86e41acce2ff2f3f71d31d5368611fa9 Mon Sep 17 00:00:00 2001
From: John Regehr <regehr@cs.utah.edu>
Date: Mon, 14 Sep 2026 21:30:26 -0600
Subject: [PATCH] tweak

---
 llvm_util/utils.cpp                             |  5 +++++
 tests/alive-tv/vector/scalable-struct.srctgt.ll | 10 ++++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 tests/alive-tv/vector/scalable-struct.srctgt.ll

diff --git a/llvm_util/utils.cpp b/llvm_util/utils.cpp
index 8e1e3a9ec..502d388fe 100644
--- a/llvm_util/utils.cpp
+++ b/llvm_util/utils.cpp
@@ -159,6 +159,11 @@ Type* llvm_type2alive(const llvm::Type *ty) {
     if (strty->isOpaque())
       return get_int_type(8);
 
+    // If there's a scalable struct member, return early since
+    // otherwise getStructLayout() will assert out
+    if (strty->isScalableTy())
+      return nullptr;
+
     auto &cache = type_cache[ty];
     if (!cache) {
       vector<Type*> elems;
diff --git a/tests/alive-tv/vector/scalable-struct.srctgt.ll b/tests/alive-tv/vector/scalable-struct.srctgt.ll
new file mode 100644
index 000000000..2ecce571b
--- /dev/null
+++ b/tests/alive-tv/vector/scalable-struct.srctgt.ll
@@ -0,0 +1,10 @@
+define {<vscale x 2 x i32>, i32} @src({<vscale x 2 x i32>, i32} %x) {
+  ret {<vscale x 2 x i32>, i32} %x
+}
+
+define {<vscale x 2 x i32>, i32} @tgt({<vscale x 2 x i32>, i32} %x) {
+  ret {<vscale x 2 x i32>, i32} %x
+}
+
+; ERROR: Could not translate 'src' to Alive IR
+; SKIP-IDENTITY