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Optimize ceil_log2 function

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This commit is contained in:
Matthew Daiter 2019-05-06 18:33:56 -05:00
parent 752553d8e9
commit bafbb9ee90
2 changed files with 5 additions and 3 deletions
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6
kernel/yosys.cc
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@ -151,14 +151,16 @@ void yosys_banner()
int ceil_log2(int x)
{
#if defined(__GNUC__)
return x > 1 ? (8*sizeof(int)) - __builtin_clz(x-1) : 0;
#else
if (x <= 0)
return 0;
for (int i = 0; i < 32; i++)
if (((x-1) >> i) == 0)
return i;
log_abort();
#endif
}
std::string stringf(const char *fmt, ...)