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flag intended fallthrough cases for GNU compilers

This commit is contained in:
Axel Kohlmeyer 2019-04-04 09:38:53 -04:00
parent a9c376f20d
commit 50427ce05d
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GPG Key ID: D9B44E93BF0C375A
1 changed files with 21 additions and 11 deletions
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32
src/hashlittle.cpp
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@ -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;