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mesa: Fix mesa_next_pow_two to return same value if parameter is pow2.

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Without subtracting one pow2 value would be rounded up to next pow2
which is not correct behaviour for the function.
This commit is contained in:
Pauli Nieminen 2010-02-07 07:36:13 +02:00
parent ce1f351963
commit 1a45c2bce7
1 changed files with 5 additions and 3 deletions
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8
src/mesa/main/imports.h
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@ -417,7 +417,8 @@ static INLINE int32_t
_mesa_next_pow_two_32(uint32_t x)
{
#ifdef __GNUC__
return 1 << (__builtin_clz(x) ^ 31);
x--;
return 1 << ((__builtin_clz(x) ^ 31) + 1);
#else
x--;
x |= x >> 1;
@ -434,10 +435,11 @@ static INLINE int64_t
_mesa_next_pow_two_64(uint64_t x)
{
#ifdef __GNUC__
x--;
if (sizeof(x) == sizeof(long))
return 1 << (__builtin_clzl(x) ^ 63);
return 1 << ((__builtin_clzl(x) ^ 63) + 1);
else
return 1 << (__builtin_clzll(x) ^ 63);
return 1 << ((__builtin_clzll(x) ^ 63) + 1);
#else
x--;
x |= x >> 1;