1 files changed, 35 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/SystemZ/rot-01.ll b/llvm/test/CodeGen/SystemZ/rot-01.ll
new file mode 100644
index 00000000000..5e97f5d6505
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/rot-01.ll
@@ -0,0 +1,35 @@
+; Test shortening of NILL to NILF when the result is used as a rotate amount.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+; Test 32-bit rotate.
+define i32 @f1(i32 %val, i32 %amt) {
+; CHECK-LABEL: f1:
+; CHECK: nill %r3, 31
+; CHECK: rll %r2, %r2, 0(%r3)
+  %mod = urem i32 %amt, 32
+
+  %inv = sub i32 32, %mod
+  %parta = shl i32 %val, %mod
+  %partb = lshr i32 %val, %inv
+
+  %rotl = or i32 %parta, %partb
+
+  ret i32 %rotl
+}
+
+; Test 64-bit rotate.
+define i64 @f2(i64 %val, i64 %amt) {
+; CHECK-LABEL: f2:
+; CHECK: nill %r3, 63
+; CHECK: rllg %r2, %r2, 0(%r3)
+  %mod = urem i64 %amt, 64
+
+  %inv = sub i64 64, %mod
+  %parta = shl i64 %val, %mod
+  %partb = lshr i64 %val, %inv
+
+  %rotl = or i64 %parta, %partb
+
+  ret i64 %rotl
+}