Check in LLVM r95781.
diff --git a/test/CodeGen/X86/dyn-stackalloc.ll b/test/CodeGen/X86/dyn-stackalloc.ll
new file mode 100644
index 0000000..1df0920
--- /dev/null
+++ b/test/CodeGen/X86/dyn-stackalloc.ll
@@ -0,0 +1,16 @@
+; RUN: llc < %s -march=x86 | not egrep {\\\$4294967289|-7}
+; RUN: llc < %s -march=x86 | egrep {\\\$4294967280|-16}
+; RUN: llc < %s -march=x86-64 | grep {\\-16}
+
+define void @t() nounwind {
+A:
+ br label %entry
+
+entry:
+ %m1 = alloca i32, align 4
+ %m2 = alloca [7 x i8], align 16
+ call void @s( i32* %m1, [7 x i8]* %m2 )
+ ret void
+}
+
+declare void @s(i32*, [7 x i8]*)