Add a testcase for i256 add. i256 isn't fully supported in

codegen right now, but add and subtract work.

llvm-svn: 57260

llvm/test/CodeGen/X86/i256-add.ll

@@ -0,0 +1,18 @@
+; RUN: llvm-as < %s | llc -march=x86 > %t
+; RUN: grep adcl %t | count 7
+; RUN: grep sbbl %t | count 7
+
+define void @add(i256* %p, i256* %q) nounwind {
+  %a = load i256* %p
+  %b = load i256* %q
+  %c = add i256 %a, %b
+  store i256 %c, i256* %p
+  ret void
+}
+define void @sub(i256* %p, i256* %q) nounwind {
+  %a = load i256* %p
+  %b = load i256* %q
+  %c = sub i256 %a, %b
+  store i256 %c, i256* %p
+  ret void
+}