1 files changed, 69 insertions, 0 deletions
diff --git a/test/CodeGen/SystemZ/atomicrmw-sub-06.ll b/test/CodeGen/SystemZ/atomicrmw-sub-06.ll
new file mode 100644
index 0000000000..5d11bdf96c
--- /dev/null
+++ b/test/CodeGen/SystemZ/atomicrmw-sub-06.ll
@@ -0,0 +1,69 @@
+; Test 64-bit atomic subtractions, z196 version.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z196 | FileCheck %s
+
+; Check addition of a variable.
+define i64 @f1(i64 %dummy, i64 *%src, i64 %b) {
+; CHECK-LABEL: f1:
+; CHECK: lcgr [[NEG:%r[0-5]]], %r4
+; CHECK: laag %r2, [[NEG]], 0(%r3)
+; CHECK: br %r14
+  %res = atomicrmw sub i64 *%src, i64 %b seq_cst
+  ret i64 %res
+}
+
+; Check addition of 1, which needs a temporary.
+define i64 @f2(i64 %dummy, i64 *%src) {
+; CHECK-LABEL: f2:
+; CHECK: lghi [[TMP:%r[0-5]]], -1
+; CHECK: laag %r2, [[TMP]], 0(%r3)
+; CHECK: br %r14
+  %res = atomicrmw sub i64 *%src, i64 1 seq_cst
+  ret i64 %res
+}
+
+; Check the high end of the LAAG range.
+define i64 @f3(i64 %dummy, i64 *%src, i64 %b) {
+; CHECK-LABEL: f3:
+; CHECK: lcgr [[NEG:%r[0-5]]], %r4
+; CHECK: laag %r2, [[NEG]], 524280(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr i64 *%src, i64 65535
+  %res = atomicrmw sub i64 *%ptr, i64 %b seq_cst
+  ret i64 %res
+}
+
+; Check the next doubleword up, which needs separate address logic.
+define i64 @f4(i64 %dummy, i64 *%src, i64 %b) {
+; CHECK-LABEL: f4:
+; CHECK-DAG: lcgr [[NEG:%r[0-5]]], %r4
+; CHECK-DAG: agfi %r3, 524288
+; CHECK: laag %r2, [[NEG]], 0(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr i64 *%src, i64 65536
+  %res = atomicrmw sub i64 *%ptr, i64 %b seq_cst
+  ret i64 %res
+}
+
+; Check the low end of the LAAG range.
+define i64 @f5(i64 %dummy, i64 *%src, i64 %b) {
+; CHECK-LABEL: f5:
+; CHECK: lcgr [[NEG:%r[0-5]]], %r4
+; CHECK: laag %r2, [[NEG]], -524288(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr i64 *%src, i64 -65536
+  %res = atomicrmw sub i64 *%ptr, i64 %b seq_cst
+  ret i64 %res
+}
+
+; Check the next doubleword down, which needs separate address logic.
+define i64 @f6(i64 %dummy, i64 *%src, i64 %b) {
+; CHECK-LABEL: f6:
+; CHECK-DAG: lcgr [[NEG:%r[0-5]]], %r4
+; CHECK-DAG: agfi %r3, -524296
+; CHECK: laag %r2, [[NEG]], 0(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr i64 *%src, i64 -65537
+  %res = atomicrmw sub i64 *%ptr, i64 %b seq_cst
+  ret i64 %res
+}