Revert to prefer-vector-width since Intel dropped avx10-256

Author: okuhara

src/Makefile

@@ -53,8 +53,7 @@ ifeq ($(COMP),gcc)
 		CFLAGS += -m64 -march=x86-64-v3 -DUSE_GAS_X64 -DPOPCOUNT
 	endif
 	ifeq ($(ARCH),x86-64-v4)
-		# use -mprefer-vector-width=256 instead of -mno-evex512 for gcc-13 and earlier
-		CFLAGS += -m64 -march=x86-64-v4 -mno-evex512 -DUSE_GAS_X64 -DPOPCOUNT
+		CFLAGS += -m64 -march=x86-64-v4 -mprefer-vector-width=256 -DUSE_GAS_X64 -DPOPCOUNT
 	endif
 	ifeq ($(ARCH),x86-64-v2)
 		CFLAGS += -m64 -mpopcnt -mtune=generic -DUSE_GAS_X64 -DPOPCOUNT
@@ -178,8 +177,7 @@ ifeq ($(COMP),clang)
 		CFLAGS += -m64 -march=x86-64-v3 -DUSE_GAS_X64 -DPOPCOUNT
 	endif
 	ifeq ($(ARCH),x86-64-v4)
-		# use -mprefer-vector-width=256 instead of -mno-evex512 for clang-17 and earlier
-		CFLAGS += -m64 -march=x86-64-v4 -mno-evex512 -DUSE_GAS_X64 -DPOPCOUNT
+		CFLAGS += -m64 -march=x86-64-v4 -mprefer-vector-width=256 -DUSE_GAS_X64 -DPOPCOUNT
 	endif
 	ifeq ($(ARCH),x86-64-v2)
 		CFLAGS += -m64 -mpopcnt -DUSE_GAS_X64 -DPOPCOUNT