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Replace __builtin_clz() and __builtin_clzll() with some straight forward solution

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This commit is contained in:
jsteube 2017-03-02 23:12:31 +01:00
parent fe66714fd7
commit ce337c5863
1 changed files with 10 additions and 2 deletions
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12
src/shared.c
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@ -9,12 +9,20 @@
static inline int get_msb32 (const u32 v) static inline int get_msb32 (const u32 v)
{ {
return 32 - __builtin_clz (v); int i;
for (i = 32; i > 0; i--) if ((v >> (i - 1)) & 1) break;
return i;
} }
static inline int get_msb64 (const u64 v) static inline int get_msb64 (const u64 v)
{ {
return 64 - __builtin_clzll (v); int i;
for (i = 64; i > 0; i--) if ((v >> (i - 1)) & 1) break;
return i;
} }
bool overflow_check_u32_add (const u32 a, const u32 b) bool overflow_check_u32_add (const u32 a, const u32 b)