From 67028cee5177aa5e5f9300114c9a8449258adb3a Mon Sep 17 00:00:00 2001
From: bjorn3 <bjorn3@users.noreply.github.com>
Date: Sat, 28 Mar 2020 15:33:50 +0100
Subject: [PATCH] Use PassMode::ByVal for Abi::Vector

---
 src/abi/pass_mode.rs  | 8 +++++++-
 src/intrinsics/mod.rs | 2 +-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/abi/pass_mode.rs b/src/abi/pass_mode.rs
index 390637e8e44..02604a37572 100644
--- a/src/abi/pass_mode.rs
+++ b/src/abi/pass_mode.rs
@@ -100,7 +100,13 @@ pub(super) fn get_pass_mode<'tcx>(tcx: TyCtxt<'tcx>, layout: TyAndLayout<'tcx>)
             }
 
             // FIXME implement Vector Abi in a cg_llvm compatible way
-            Abi::Vector { .. } => PassMode::ByRef { size: Some(layout.size) },
+            Abi::Vector { .. } => {
+                if let Some(vector_ty) = crate::intrinsics::clif_vector_type(tcx, layout) {
+                    PassMode::ByVal(vector_ty)
+                } else {
+                    PassMode::ByRef { size: Some(layout.size) }
+                }
+            }
 
             Abi::Aggregate { sized: true } => PassMode::ByRef { size: Some(layout.size) },
             Abi::Aggregate { sized: false } => PassMode::ByRef { size: None },
diff --git a/src/intrinsics/mod.rs b/src/intrinsics/mod.rs
index ae2fe30989a..ea7326edc04 100644
--- a/src/intrinsics/mod.rs
+++ b/src/intrinsics/mod.rs
@@ -175,7 +175,7 @@ fn lane_type_and_count<'tcx>(
     (lane_layout, lane_count)
 }
 
-fn clif_vector_type<'tcx>(tcx: TyCtxt<'tcx>, layout: TyAndLayout<'tcx>) -> Option<Type> {
+pub(crate) fn clif_vector_type<'tcx>(tcx: TyCtxt<'tcx>, layout: TyAndLayout<'tcx>) -> Option<Type> {
     let (element, count) = match &layout.abi {
         Abi::Vector { element, count } => (element.clone(), *count),
         _ => unreachable!(),