From 132e604aa399a3bcb91996e550cf8972bd88422c Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Tue, 27 Feb 2018 17:12:53 -0500
Subject: llvm coroutine workaround: sret functions return sret pointer

---
 src/analyze.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'src/analyze.cpp')

diff --git a/src/analyze.cpp b/src/analyze.cpp
index 26924cc7db..09c5566c5f 100644
--- a/src/analyze.cpp
+++ b/src/analyze.cpp
@@ -1026,7 +1026,10 @@ TypeTableEntry *get_fn_type(CodeGen *g, FnTypeId *fn_type_id) {
             gen_param_index += 1;
             // after the gen_param_index += 1 because 0 is the return type
             param_di_types[gen_param_index] = gen_type->di_type;
-            gen_return_type = g->builtin_types.entry_void;
+
+            // as a workaround for LLVM coroutines not understanding instruction dependencies,
+            // we return the sret pointer argument instead of returning void
+            gen_return_type = gen_type;
         } else {
             gen_return_type = fn_type_id->return_type;
         }
-- 
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