From 0d26c61ff2ce27d7af7cdf4c805bde1a032ae435 Mon Sep 17 00:00:00 2001
From: anematode <timothy.herchen@gmail.com>
Date: Mon, 2 Feb 2026 01:45:58 -0800
Subject: [PATCH] fix return type of vmovl_high_s8

also add -flax-vector-conversions=none to the build

closes https://github.com/official-stockfish/Stockfish/pull/6587

No functional change
---
 src/Makefile    | 2 +-
 src/nnue/simd.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Makefile b/src/Makefile
index dcd3f1fea..3f4f8be97 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -515,7 +515,7 @@ ifeq ($(COMP),clang)
 	endif
 
 	CXXFLAGS += -pedantic -Wextra -Wshadow -Wmissing-prototypes \
-	            -Wconditional-uninitialized
+	            -Wconditional-uninitialized -flax-vector-conversions=none
 
 	ifeq ($(filter $(KERNEL),Darwin OpenBSD FreeBSD),)
 	ifeq ($(target_windows),)
diff --git a/src/nnue/simd.h b/src/nnue/simd.h
index 25891163e..9c689b098 100644
--- a/src/nnue/simd.h
+++ b/src/nnue/simd.h
@@ -216,7 +216,7 @@ static constexpr std::uint32_t Mask[4] = {1, 2, 4, 8};
 
     #ifndef __aarch64__
 // Single instruction doesn't exist on 32-bit ARM
-inline int8x16_t vmovl_high_s8(int8x16_t val) { return vmovl_s8(vget_high_s8(val)); }
+inline int16x8_t vmovl_high_s8(int8x16_t val) { return vmovl_s8(vget_high_s8(val)); }
     #endif
 
 #else