From 27fc08c3b6397fa1588d69f622d7f057024be501 Mon Sep 17 00:00:00 2001
From: Jakob Botsch Nielsen <jakob.botsch.nielsen@gmail.com>
Date: Tue, 23 May 2023 11:20:35 +0200
Subject: [PATCH] JIT: Use unsigned native return types for small structs

Prefer the return type to be unsigned when small structs are returned in
registers. This causes the backend to use zero extension instead of sign
extension in a few cases, which has a smaller encoding on xarch.
---
 src/coreclr/jit/compiler.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/coreclr/jit/compiler.cpp b/src/coreclr/jit/compiler.cpp
index 6a19d89253d40f..688a4b61b87ea2 100644
--- a/src/coreclr/jit/compiler.cpp
+++ b/src/coreclr/jit/compiler.cpp
@@ -529,11 +529,11 @@ var_types Compiler::getPrimitiveTypeForStruct(unsigned structSize, CORINFO_CLASS
     switch (structSize)
     {
         case 1:
-            useType = TYP_BYTE;
+            useType = TYP_UBYTE;
             break;
 
         case 2:
-            useType = TYP_SHORT;
+            useType = TYP_USHORT;
             break;
 
 #if !defined(TARGET_XARCH) || defined(UNIX_AMD64_ABI)