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Implemented SIMD rsqrt.

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This commit is contained in:
Branimir Karadžić
2018-01-29 20:35:51 -08:00
parent 672a39f4f4
commit c1f8036b70
3 changed files with 53 additions and 18 deletions
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21
include/bx/inline/math.inl
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@@ -208,11 +208,30 @@ namespace bx
#endif // BX_CONFIG_SUPPORTS_SIMD
}
inline float rsqrt(float _a)
inline float rsqrtRef(float _a)
{
return pow(_a, -0.5f);
}
inline float rsqrtSimd(float _a)
{
const simd128_t aa = simd_splat(_a);
const simd128_t rsqrta = simd_rsqrt(aa);
float result;
simd_stx(&result, rsqrta);
return result;
}
inline float rsqrt(float _a)
{
#if BX_CONFIG_SUPPORTS_SIMD
return rsqrtSimd(_a);
#else
return rsqrtRef(_a);
#endif // BX_CONFIG_SUPPORTS_SIMD
}
inline float trunc(float _a)
{
return float(int(_a) );

44
tests/math_bench.cpp
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@@ -11,7 +11,6 @@
typedef float (*MathFn)(float);
template<MathFn mfn>
float mathTest(const char* _name)
{
@@ -32,37 +31,48 @@ float mathTest(const char* _name)
return result;
}
float rsqrt(float _a)
{
return 1.0f/::sqrtf(_a);
}
void math_bench()
{
bx::WriterI* writer = bx::getStdOut();
bx::writePrintf(writer, "Math bench\n\n");
mathTest< ::sqrtf >("::sqrtf");
mathTest<bx::sqrtRef >("bx::sqrtRef");
mathTest<bx::sqrtSimd>("bx::sqrtSimd");
mathTest<bx::sqrt >("bx::sqrt");
mathTest< ::sqrtf >("::sqrtf");
mathTest<bx::sqrtRef >("bx::sqrtRef");
mathTest<bx::sqrtSimd >("bx::sqrtSimd");
mathTest<bx::sqrt >("bx::sqrt");
bx::writePrintf(writer, "\n");
mathTest< ::sinf >("::sinf");
mathTest<bx::sin >("bx::sin");
mathTest< ::rsqrt >("::rsqrtf");
mathTest<bx::rsqrtRef >("bx::sqrtRef");
mathTest<bx::rsqrtSimd>("bx::sqrtSimd");
mathTest<bx::rsqrt >("bx::rsqrt");
bx::writePrintf(writer, "\n");
mathTest< ::asinf >("::asinf");
mathTest<bx::asin >("bx::asin");
mathTest< ::sinf >("::sinf");
mathTest<bx::sin >("bx::sin");
bx::writePrintf(writer, "\n");
mathTest< ::cosf >("::cosf");
mathTest<bx::cos >("bx::cos");
mathTest< ::asinf>("::asinf");
mathTest<bx::asin >("bx::asin");
bx::writePrintf(writer, "\n");
mathTest< ::acosf >("::acosf");
mathTest<bx::acos >("bx::acos");
mathTest< ::cosf >("::cosf");
mathTest<bx::cos >("bx::cos");
bx::writePrintf(writer, "\n");
mathTest< ::tanf >("::tanf");
mathTest<bx::tan >("bx::tan");
mathTest< ::acosf>("::acosf");
mathTest<bx::acos >("bx::acos");
bx::writePrintf(writer, "\n");
mathTest< ::atanf >("::atanf");
mathTest<bx::atan >("bx::atan");
mathTest< ::tanf >("::tanf");
mathTest<bx::tan >("bx::tan");
bx::writePrintf(writer, "\n");
mathTest< ::atanf>("::atanf");
mathTest<bx::atan >("bx::atan");
}

6
tests/math_test.cpp
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@@ -70,6 +70,12 @@ TEST_CASE("libm", "")
REQUIRE(bx::equal(bx::exp(xx), ::expf(xx), 0.00001f) );
}
for (float xx = 0.0f; xx < 100.0f; xx += 0.1f)
{
bx::writePrintf(writer, "rsqrt(%f) == %f (expected: %f)\n", xx, bx::rsqrt(xx), 1.0f/::sqrtf(xx) );
REQUIRE(bx::equal(bx::rsqrt(xx), 1.0f/::sqrtf(xx), 0.00001f) );
}
for (float xx = 0.0f; xx < 100.0f; xx += 0.1f)
{
bx::writePrintf(writer, "sqrt(%f) == %f (expected: %f)\n", xx, bx::sqrt(xx), ::sqrtf(xx) );