1 files changed, 22 insertions, 0 deletions
diff --git a/test/CodeGen/AArch64/arm64-sitofp-combine-chains.ll b/test/CodeGen/AArch64/arm64-sitofp-combine-chains.ll
new file mode 100644
index 0000000000..10b433b977
--- /dev/null
+++ b/test/CodeGen/AArch64/arm64-sitofp-combine-chains.ll
@@ -0,0 +1,22 @@
+; RUN: llc -march=arm64 -o -  %s | FileCheck %s
+
+; ARM64ISelLowering.cpp was creating a new (floating-point) load for efficiency
+; but not updating chain-successors of the old one. As a result, the two memory
+; operations in this function both ended up direct successors to the EntryToken
+; and could be reordered.
+
+@var = global i32 0, align 4
+
+define float @foo() {
+; CHECK-LABEL: foo:
+  ; Load must come before we clobber @var
+; CHECK: adrp x[[VARBASE:[0-9]+]], {{_?var}}
+; CHECK: ldr [[SREG:s[0-9]+]], [x[[VARBASE]],
+; CHECK: str wzr, [x[[VARBASE]],
+
+  %val = load i32* @var, align 4
+  store i32 0, i32* @var, align 4
+
+  %fltval = sitofp i32 %val to float
+  ret float %fltval
+}