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Fixed issue with frexp.

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This commit is contained in:
Бранимир Караџић
2024-12-05 19:42:14 -08:00
parent b97e679fc8
commit e88e4bbad8
8 changed files with 50 additions and 44 deletions
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25
include/bx/inline/math.inl
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@@ -386,20 +386,6 @@ namespace bx
return result;
}
inline BX_CONSTEXPR_FUNC float frexp(float _a, int32_t* _outExp)
{
const uint32_t ftob = floatToBits(_a);
const uint32_t masked0 = uint32_and(ftob, kFloatExponentMask);
const uint32_t exp0 = uint32_srl(masked0, kFloatExponentBitShift);
const uint32_t masked1 = uint32_and(ftob, kFloatSignMask | kFloatMantissaMask);
const uint32_t bits = uint32_or(masked1, UINT32_C(0x3f000000) );
const float result = bitsToFloat(bits);
*_outExp = int32_t(exp0 - 0x7e);
return result;
}
inline BX_CONSTEXPR_FUNC float ldexp(float _a, int32_t _b)
{
const uint32_t ftob = floatToBits(_a);
@@ -416,8 +402,15 @@ namespace bx
inline BX_CONSTEXPR_FUNC float log(float _a)
{
int32_t exp = 0;
float ff = frexp(_a, &exp);
const uint32_t ftob = floatToBits(_a);
const uint32_t masked0 = uint32_and(ftob, kFloatExponentMask);
const uint32_t exp0 = uint32_srl(masked0, kFloatExponentBitShift);
int32_t exp = int32_t(exp0 - 0x7e);
const uint32_t masked1 = uint32_and(ftob, kFloatSignMask | kFloatMantissaMask);
const uint32_t bits = uint32_or(masked1, UINT32_C(0x3f000000) );
float ff = bitsToFloat(bits);
if (ff < kSqrt2*0.5f)
{

2
include/bx/math.h
View File

@@ -261,7 +261,7 @@ namespace bx
/// Returns decomposed given floating point value _a into a normalized fraction and
/// an integral power of two.
///
BX_CONSTEXPR_FUNC float frexp(float _a, int32_t* _outExp);
float frexp(float _a, int32_t* _outExp);
/// Returns e (2.71828...) raised to the _a power.
///