[Hexagon] Handle returning small structures by value

This is compliant with the official ABI, but allows experimentation with
calling conventions.

llvm-svn: 275822

1 files changed, 18 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/Hexagon/ret-struct-by-val.ll b/llvm/test/CodeGen/Hexagon/ret-struct-by-val.ll
new file mode 100644
index 00000000000..26ed2ff36f7
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/ret-struct-by-val.ll
@@ -0,0 +1,18 @@
+; RUN: llc -march=hexagon < %s | FileCheck %s
+; CHECK: r0 = add(r0, r1)
+
+; Allow simple structures to be returned by value.
+
+%s = type { i32, i32 }
+
+declare %s @foo() #0
+
+define i32 @fred() #0 {
+  %t0 = call %s @foo()
+  %x = extractvalue %s %t0, 0
+  %y = extractvalue %s %t0, 1
+  %r = add i32 %x, %y
+  ret i32 %r
+}
+
+attributes #0 = { nounwind }