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, 40 insertions, 0 deletions

diff --git a/test/CodeGen/X86/tail-call-parameter-attrs-mismatch.ll b/test/CodeGen/X86/tail-call-parameter-attrs-mismatch.ll
new file mode 100644
index 000000000000..73ce3b781f9d
--- /dev/null
+++ b/test/CodeGen/X86/tail-call-parameter-attrs-mismatch.ll
@@ -0,0 +1,40 @@
+; RUN: llc -mtriple=i686-unknown-linux-gnu -o - %s | FileCheck %s
+
+declare void @f(i16 signext)
+declare void @g(i32 signext)
+
+
+define void @flags_match(i16 signext %x) {
+entry:
+  tail call void @f(i16 signext %x)
+  ret void
+
+; The parameter flags match; do the tail call.
+; CHECK-LABEL: flags_match:
+; CHECK: jmp f
+}
+
+define void @flags_mismatch(i16 zeroext %x) {
+entry:
+  tail call void @f(i16 signext %x)
+  ret void
+
+; The parameter flags mismatch. %x has not been sign-extended,
+; so tail call is not possible.
+; CHECK-LABEL: flags_mismatch:
+; CHECK: movswl
+; CHECK: calll f
+}
+
+
+define void @mismatch_doesnt_matter(i32 zeroext %x) {
+entry:
+  tail call void @g(i32 signext %x)
+  ret void
+
+; The parameter flags mismatch, but the type is wide enough that
+; no extension takes place in practice, so do the tail call.
+
+; CHECK-LABEL: mismatch_doesnt_matter:
+; CHECK: jmp g
+}