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hiscoa-compress: faster msb calculation #48

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hiscoa-compress: faster msb calculation #48

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6 changes: 1 addition & 5 deletions src/hiscoa-compress.c
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Original file line number Diff line number Diff line change
Expand Up @@ -89,13 +89,9 @@ static void swap(unsigned *a, unsigned *b)

static unsigned find_msb(unsigned val)
{
/* FIXME do this faster */
unsigned nbits;
if (val == 0)
return 0;
for (nbits = 8 * sizeof(val) - 1; val < (1u << nbits); --nbits)
;
return nbits + 1;
return 8 * sizeof(val) - __builtin_clz(val);
}

static bool try_write_longrepeat(struct state *state)
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