Vendor import of llvm release_39 branch r276489:vendor/llvm/llvm-release_39-r276489

https://llvm.org/svn/llvm-project/llvm/branches/release_39@276489

1 files changed, 24 insertions, 0 deletions

diff --git a/test/CodeGen/AArch64/tailcall-ccmismatch.ll b/test/CodeGen/AArch64/tailcall-ccmismatch.ll
new file mode 100644
index 000000000000..ab96e609dd46
--- /dev/null
+++ b/test/CodeGen/AArch64/tailcall-ccmismatch.ll
@@ -0,0 +1,24 @@
+; RUN: llc -o - %s | FileCheck %s
+target triple="aarch64--"
+
+declare void @somefunc()
+define preserve_mostcc void @test_ccmismatch_notail() {
+; Ensure that no tail call is used here, as the called function somefunc does
+; not preserve enough registers for preserve_mostcc.
+; CHECK-LABEL: test_ccmismatch_notail:
+; CHECK-NOT: b somefunc
+; CHECK: bl somefunc
+  tail call void @somefunc()
+  ret void
+}
+
+declare preserve_mostcc void @some_preserve_most_func()
+define void @test_ccmismatch_tail() {
+; We can perform a tail call here, because some_preserve_most_func preserves
+; all registers necessary for test_ccmismatch_tail.
+; CHECK-LABEL: test_ccmismatch_tail:
+; CHECK-NOT: bl some_preserve_most_func
+; CHECK: b some_preserve_most_func
+  tail call preserve_mostcc void @some_preserve_most_func()
+  ret void
+}