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Micro-optimize float4x4 operations when SIMD is not supported

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This commit is contained in:
Jukka Jylänki
2020-05-06 16:57:16 +03:00
committed by Бранимир Караџић
parent 73af60ade3
commit b1a707fac8
2 changed files with 98 additions and 1 deletions
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12
include/bx/float4x4_t.h
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@@ -22,9 +22,19 @@ namespace bx
///
simd128_t simd_mul(simd128_t _a, const float4x4_t* _b);
///
/// Multiplies two matrices
void float4x4_mul(float4x4_t* _result, const float4x4_t* _a, const float4x4_t* _b);
/// Multiplies two 3x4 affine matrices (i.e. "model" or "world" matrices).
/// This function is a micro-optimized version of float4x4_mul() in the case
/// when the last row of the both input matrices are (0, 0, 0, 1).
void model4x4_mul(float4x4_t* _result, const float4x4_t* _a, const float4x4_t* _b);
/// Multiplies a 3x4 affine matrix with a general 4x4 matrix.
/// This function is a micro-optimized version of float4x4_mul() in the case
/// when the last row of the _model input matrix is (0, 0, 0, 1).
void model4x4_mul_viewproj4x4(float4x4_t* _result, const float4x4_t* _model, const float4x4_t* _viewProj);
///
void float4x4_transpose(float4x4_t* _result, const float4x4_t* _mtx);

87
include/bx/inline/float4x4_t.inl
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@@ -40,10 +40,97 @@ namespace bx
BX_SIMD_INLINE void float4x4_mul(float4x4_t* _result, const float4x4_t* _a, const float4x4_t* _b)
{
#if !BX_CONFIG_SUPPORTS_SIMD
const float *a = (const float*)_a;
const float *b = (const float*)_b;
float *r = (float*)_result;
r[0] = a[0]*b[0] + a[1]*b[4] + a[2]*b[8] + a[3]*b[12];
r[1] = a[0]*b[1] + a[1]*b[5] + a[2]*b[9] + a[3]*b[13];
r[2] = a[0]*b[2] + a[1]*b[6] + a[2]*b[10] + a[3]*b[14];
r[3] = a[0]*b[3] + a[1]*b[7] + a[2]*b[11] + a[3]*b[15];
r[4] = a[4]*b[0] + a[5]*b[4] + a[6]*b[8] + a[7]*b[12];
r[5] = a[4]*b[1] + a[5]*b[5] + a[6]*b[9] + a[7]*b[13];
r[6] = a[4]*b[2] + a[5]*b[6] + a[6]*b[10] + a[7]*b[14];
r[7] = a[4]*b[3] + a[5]*b[7] + a[6]*b[11] + a[7]*b[15];
r[8] = a[8]*b[0] + a[9]*b[4] + a[10]*b[8] + a[11]*b[12];
r[9] = a[8]*b[1] + a[9]*b[5] + a[10]*b[9] + a[11]*b[13];
r[10] = a[8]*b[2] + a[9]*b[6] + a[10]*b[10] + a[11]*b[14];
r[11] = a[8]*b[3] + a[9]*b[7] + a[10]*b[11] + a[11]*b[15];
r[12] = a[12]*b[0] + a[13]*b[4] + a[14]*b[8] + a[15]*b[12];
r[13] = a[12]*b[1] + a[13]*b[5] + a[14]*b[9] + a[15]*b[13];
r[14] = a[12]*b[2] + a[13]*b[6] + a[14]*b[10] + a[15]*b[14];
r[15] = a[12]*b[3] + a[13]*b[7] + a[14]*b[11] + a[15]*b[15];
#else
_result->col[0] = simd_mul(_a->col[0], _b);
_result->col[1] = simd_mul(_a->col[1], _b);
_result->col[2] = simd_mul(_a->col[2], _b);
_result->col[3] = simd_mul(_a->col[3], _b);
#endif
}
BX_SIMD_INLINE void model4x4_mul(float4x4_t* _result, const float4x4_t* _a, const float4x4_t* _b)
{
#if !BX_CONFIG_SUPPORTS_SIMD
const float *a = (const float*)_a; // a[3]==a[7]==a[11]==0, a[15]=1
const float *b = (const float*)_b; // b[3]==b[7]==b[11]==0, b[15]=1
float *r = (float*)_result;
r[0] = a[0]*b[0] + a[1]*b[4] + a[2]*b[8];
r[1] = a[0]*b[1] + a[1]*b[5] + a[2]*b[9];
r[2] = a[0]*b[2] + a[1]*b[6] + a[2]*b[10];
r[3] = 0.f;
r[4] = a[4]*b[0] + a[5]*b[4] + a[6]*b[8];
r[5] = a[4]*b[1] + a[5]*b[5] + a[6]*b[9];
r[6] = a[4]*b[2] + a[5]*b[6] + a[6]*b[10];
r[7] = 0.f;
r[8] = a[8]*b[0] + a[9]*b[4] + a[10]*b[8];
r[9] = a[8]*b[1] + a[9]*b[5] + a[10]*b[9];
r[10] = a[8]*b[2] + a[9]*b[6] + a[10]*b[10];
r[11] = 0.f;
r[12] = a[12]*b[0] + a[13]*b[4] + a[14]*b[8] + b[12];
r[13] = a[12]*b[1] + a[13]*b[5] + a[14]*b[9] + b[13];
r[14] = a[12]*b[2] + a[13]*b[6] + a[14]*b[10] + b[14];
r[15] = 1.f;
#else
// With SIMD faster to do the general 4x4 form:
float4x4_mul(_result, _a, _b);
#endif
}
BX_SIMD_INLINE void model4x4_mul_viewproj4x4(float4x4_t* _result, const float4x4_t* _model, const float4x4_t* _viewProj)
{
#if !BX_CONFIG_SUPPORTS_SIMD
const float *a = (const float*)_model; // a[3]==a[7]==a[11]==0, a[15]=1
const float *b = (const float*)_viewProj;
float *r = (float*)_result;
r[0] = a[0]*b[0] + a[1]*b[4] + a[2]*b[8];
r[1] = a[0]*b[1] + a[1]*b[5] + a[2]*b[9];
r[2] = a[0]*b[2] + a[1]*b[6] + a[2]*b[10];
r[3] = a[0]*b[3] + a[1]*b[7] + a[2]*b[11];
r[4] = a[4]*b[0] + a[5]*b[4] + a[6]*b[8];
r[5] = a[4]*b[1] + a[5]*b[5] + a[6]*b[9];
r[6] = a[4]*b[2] + a[5]*b[6] + a[6]*b[10];
r[7] = a[4]*b[3] + a[5]*b[7] + a[6]*b[11];
r[8] = a[8]*b[0] + a[9]*b[4] + a[10]*b[8];
r[9] = a[8]*b[1] + a[9]*b[5] + a[10]*b[9];
r[10] = a[8]*b[2] + a[9]*b[6] + a[10]*b[10];
r[11] = a[8]*b[3] + a[9]*b[7] + a[10]*b[11];
r[12] = a[12]*b[0] + a[13]*b[4] + a[14]*b[8] + b[12];
r[13] = a[12]*b[1] + a[13]*b[5] + a[14]*b[9] + b[13];
r[14] = a[12]*b[2] + a[13]*b[6] + a[14]*b[10] + b[14];
r[15] = a[12]*b[3] + a[13]*b[7] + a[14]*b[11] + b[15];
#else
// With SIMD faster to do the general 4x4 form:
float4x4_mul(_result, _model, _viewProj);
#endif
}
BX_SIMD_FORCE_INLINE void float4x4_transpose(float4x4_t* _result, const float4x4_t* _mtx)