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Cleanup.

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Бранимир Караџић
2024-11-22 19:26:20 -08:00
parent fc6859facd
commit d588a8fb0e
4 changed files with 19 additions and 17 deletions
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14
include/bx/inline/math.inl
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@@ -227,6 +227,20 @@ namespace bx
return log(_a) * kInvLogNat2;
}
inline BX_CONSTEXPR_FUNC float ldexp(float _a, int32_t _b)
{
const uint32_t ftob = floatToBits(_a);
const uint32_t masked = uint32_and(ftob, kFloatSignMask | kFloatExponentMask);
const uint32_t expsign0 = uint32_sra(masked, kFloatExponentBitShift);
const uint32_t tmp = uint32_iadd(expsign0, _b);
const uint32_t expsign1 = uint32_sll(tmp, kFloatExponentBitShift);
const uint32_t mantissa = uint32_and(ftob, kFloatMantissaMask);
const uint32_t bits = uint32_or(mantissa, expsign1);
const float result = bitsToFloat(bits);
return result;
}
template<>
inline BX_CONSTEXPR_FUNC uint8_t countBits(uint32_t _val)
{

4
include/bx/math.h
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@@ -254,9 +254,9 @@ namespace bx
///
BX_CONST_FUNC float pow(float _a, float _b);
/// Returns the result of multiplying _a by 2 raised to the power of the exponent.
/// Returns the result of multiplying _a by 2 raised to the power of the exponent `_a * (2^_b)`.
///
BX_CONST_FUNC float ldexp(float _a, int32_t _b);
BX_CONSTEXPR_FUNC float ldexp(float _a, int32_t _b);
/// Returns decomposed given floating point value _a into a normalized fraction and
/// an integral power of two.

16
src/math.cpp
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@@ -130,25 +130,11 @@ namespace bx
return result;
}
BX_CONST_FUNC float ldexp(float _a, int32_t _b)
{
const uint32_t ftob = floatToBits(_a);
const uint32_t masked = uint32_and(ftob, kFloatSignMask | kFloatExponentMask);
const uint32_t expsign0 = uint32_sra(masked, 23);
const uint32_t tmp = uint32_iadd(expsign0, _b);
const uint32_t expsign1 = uint32_sll(tmp, 23);
const uint32_t mantissa = uint32_and(ftob, kFloatMantissaMask);
const uint32_t bits = uint32_or(mantissa, expsign1);
const float result = bitsToFloat(bits);
return result;
}
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, 23);
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);

2
tests/math_test.cpp
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@@ -457,6 +457,8 @@ TEST_CASE("fract", "[math][libm]")
TEST_CASE("ldexp", "[math][libm]")
{
STATIC_REQUIRE(1389.0f == bx::ldexp(86.8125, 4) );
bx::WriterI* writer = bx::getNullOut();
bx::Error err;