flag intended fallthrough cases for GNU compilers (50427ce0) · Commits · 郑智淋 / lammps

src/hashlittle.cpp

+21 −11

Original line number	Diff line number	Diff line
		@@ -23,6 +23,16 @@
		# endif
		#endif

		// declaration to indicate intended fallthrough cases in switch statements
		// and thus silence the warnings produced by g++ -Wextra

		#if defined(__GNUC__)
		#define _fallthrough __attribute__ ((fallthrough))
		#else
		#define _fallthrough
		#endif


		#define rot(x,k) (((x)<<(k)) \| ((x)>>(32-(k))))

		/*
		@@ -291,17 +301,17 @@ uint32_t hashlittle( const void *key, size_t length, uint32_t initval)
		/-------------------------------- last block: affect all 32 bits of (c) /
		switch(length) /* all the case statements fall through */
		{
		case 12: c+=((uint32_t)k[11])<<24;
		case 11: c+=((uint32_t)k[10])<<16;
		case 10: c+=((uint32_t)k[9])<<8;
		case 9 : c+=k[8];
		case 8 : b+=((uint32_t)k[7])<<24;
		case 7 : b+=((uint32_t)k[6])<<16;
		case 6 : b+=((uint32_t)k[5])<<8;
		case 5 : b+=k[4];
		case 4 : a+=((uint32_t)k[3])<<24;
		case 3 : a+=((uint32_t)k[2])<<16;
		case 2 : a+=((uint32_t)k[1])<<8;
		case 12: c+=((uint32_t)k[11])<<24; _fallthrough;
		case 11: c+=((uint32_t)k[10])<<16; _fallthrough;
		case 10: c+=((uint32_t)k[9])<<8; _fallthrough;
		case 9 : c+=k[8]; _fallthrough;
		case 8 : b+=((uint32_t)k[7])<<24; _fallthrough;
		case 7 : b+=((uint32_t)k[6])<<16; _fallthrough;
		case 6 : b+=((uint32_t)k[5])<<8; _fallthrough;
		case 5 : b+=k[4]; _fallthrough;
		case 4 : a+=((uint32_t)k[3])<<24; _fallthrough;
		case 3 : a+=((uint32_t)k[2])<<16; _fallthrough;
		case 2 : a+=((uint32_t)k[1])<<8; _fallthrough;
		case 1 : a+=k[0];
		break;
		case 0 : return c;