1 files changed, 24 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/ARM/darwin-tls-preserved.ll b/llvm/test/CodeGen/ARM/darwin-tls-preserved.ll
new file mode 100644
index 00000000000..4969fabfd9b
--- /dev/null
+++ b/llvm/test/CodeGen/ARM/darwin-tls-preserved.ll
@@ -0,0 +1,24 @@
+; RUN: llc -mtriple=thumbv7k-apple-watchos2.0 -arm-atomic-cfg-tidy=0 -o - %s | FileCheck %s
+
+@tls_var = thread_local global i32 0
+
+; r9 and r12 can be live across the asm, but those get clobbered by the TLS
+; access (in a different BB to order it).
+define i32 @test_regs_preserved(i32* %ptr1, i32* %ptr2, i1 %tst1) {
+; CHECK-LABEL: test_regs_preserved:
+; CHECK: str {{.*}}, [sp
+; CHECK: mov {{.*}}, r12
+entry:
+  call void asm sideeffect "", "~{r0},~{r1},~{r2},~{r3},~{r4},~{r5},~{r6},~{r7},~{r8},~{r10},~{r11},~{r13},~{lr}"()
+  br i1 %tst1, label %get_tls, label %done
+
+get_tls:
+  %val = load i32, i32* @tls_var
+  br label %done
+
+done:
+  %res = phi i32 [%val, %get_tls], [0, %entry]
+  store i32 42, i32* %ptr1
+  store i32 42, i32* %ptr2
+  ret i32 %res
+}