[Hexagon] Packetize return value setup with the return instruction

Commit r279241 unintentionally reverted that ability.

llvm-svn: 279526

1 files changed, 37 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/Hexagon/packetize-return-arg.ll b/llvm/test/CodeGen/Hexagon/packetize-return-arg.ll
new file mode 100644
index 00000000000..b18fc23eca8
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/packetize-return-arg.ll
@@ -0,0 +1,37 @@
+; RUN: llc -march=hexagon < %s | FileCheck %s
+; Check that "r0 = rN" is packetized together with dealloc_return.
+; CHECK: r0 = r
+; CHECK-NOT: {
+; CHECK: dealloc_return
+
+target triple = "hexagon-unknown--elf"
+
+; Function Attrs: nounwind
+define i8* @fred(i8* %user_context, i32 %x) #0 {
+entry:
+  %and14 = add i32 %x, 255
+  %add1 = and i32 %and14, -128
+  %call = tail call i8* @malloc(i32 %add1) #1
+  %cmp = icmp eq i8* %call, null
+  br i1 %cmp, label %cleanup, label %if.end
+
+if.end:                                           ; preds = %entry
+  %0 = ptrtoint i8* %call to i32
+  %sub4 = add i32 %0, 131
+  %and5 = and i32 %sub4, -128
+  %1 = inttoptr i32 %and5 to i8*
+  %2 = inttoptr i32 %and5 to i8**
+  %arrayidx = getelementptr inbounds i8*, i8** %2, i32 -1
+  store i8* %call, i8** %arrayidx, align 4
+  br label %cleanup
+
+cleanup:                                          ; preds = %if.end, %entry
+  %retval.0 = phi i8* [ %1, %if.end ], [ null, %entry ]
+  ret i8* %retval.0
+}
+
+; Function Attrs: nounwind
+declare noalias i8* @malloc(i32) local_unnamed_addr #1
+
+attributes #0 = { nounwind }
+attributes #1 = { nobuiltin nounwind }