AArch64: add test for NZCV cross-copy save.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209665 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/AArch64/nzcv-save.ll b/test/CodeGen/AArch64/nzcv-save.ll
new file mode 100644 (file)
index 0000000..32baff3
--- /dev/null
+++ b/test/CodeGen/AArch64/nzcv-save.ll
@@ -0,0 +1,18 @@
+; RUN: llc -march=aarch64 < %s | FileCheck %s
+
+; CHECK: mrs [[NZCV_SAVE:x[0-9]+]], NZCV
+; CHECK: msr NZCV, [[NZCV_SAVE]]
+
+; DAG ends up with two uses for the flags from an ADCS node, which means they
+; must be saved for later.
+define void @f(i256* nocapture %a, i256* nocapture %b, i256* nocapture %cc, i256* nocapture %dd) nounwind uwtable noinline ssp {
+entry:
+  %c = load i256* %cc
+  %d = load i256* %dd
+  %add = add nsw i256 %c, %d
+  store i256 %add, i256* %a, align 8
+  %or = or i256 %c, 1606938044258990275541962092341162602522202993782792835301376
+  %add6 = add nsw i256 %or, %d
+  store i256 %add6, i256* %b, align 8
+  ret void
+}