Update clang-format to v20

closes https://github.com/official-stockfish/Stockfish/pull/6085

No functional change

src/Makefile

@@ -163,8 +163,8 @@ lsx = no
 lasx = no
 STRIP = strip
 
-ifneq ($(shell which clang-format-18 2> /dev/null),)
-	CLANG-FORMAT = clang-format-18
+ifneq ($(shell which clang-format-20 2> /dev/null),)
+	CLANG-FORMAT = clang-format-20
 else
 	CLANG-FORMAT = clang-format
 endif

src/nnue/nnue_feature_transformer.h

@@ -122,8 +122,7 @@ using psqt_vec_t = int32x4_t;
     #define vec_add_16(a, b) vaddq_s16(a, b)
     #define vec_sub_16(a, b) vsubq_s16(a, b)
     #define vec_mulhi_16(a, b) vqdmulhq_s16(a, b)
-    #define vec_zero() \
-        vec_t { 0 }
+    #define vec_zero() vec_t{0}
     #define vec_set_16(a) vdupq_n_s16(a)
     #define vec_max_16(a, b) vmaxq_s16(a, b)
     #define vec_min_16(a, b) vminq_s16(a, b)
@@ -133,8 +132,7 @@ using psqt_vec_t = int32x4_t;
     #define vec_store_psqt(a, b) *(a) = (b)
     #define vec_add_psqt_32(a, b) vaddq_s32(a, b)
     #define vec_sub_psqt_32(a, b) vsubq_s32(a, b)
-    #define vec_zero_psqt() \
-        psqt_vec_t { 0 }
+    #define vec_zero_psqt() psqt_vec_t{0}
     #define NumRegistersSIMD 16
     #define MaxChunkSize 16
 

src/thread.h

@@ -164,7 +164,7 @@ class ThreadPool {
     std::vector<std::unique_ptr<Thread>> threads;
     std::vector<NumaIndex>               boundThreadToNumaNode;
 
-    uint64_t accumulate(std::atomic<uint64_t> Search::Worker::*member) const {
+    uint64_t accumulate(std::atomic<uint64_t> Search::Worker::* member) const {
 
         uint64_t sum = 0;
         for (auto&& th : threads)