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Reorganize operator* to makes things a bit clearer.

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This commit is contained in:
Dave Reid 2013-04-24 14:22:27 +10:00
parent 1eb88e4bc1
commit c08ea7656b
1 changed files with 25 additions and 25 deletions
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glm/gtx/simd_quat.inl
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@ -120,54 +120,54 @@ GLM_FUNC_QUALIFIER fquatSIMD operator* (fquatSIMD const & q1, fquatSIMD const &
// 4 mul
// 4 dpps
__m128 mul0 = _mm_mul_ps(q1.Data, q2.Data);
__m128 mul1 = _mm_mul_ps(q1.Data, _mm_shuffle_ps(q2.Data, q2.Data, _MM_SHUFFLE(0, 1, 2, 3)));
__m128 mul2 = _mm_mul_ps(q1.Data, _mm_shuffle_ps(q2.Data, q2.Data, _MM_SHUFFLE(1, 0, 3, 2)));
__m128 mul3 = _mm_mul_ps(q1.Data, _mm_shuffle_ps(q2.Data, q2.Data, _MM_SHUFFLE(2, 3, 0, 1)));
__m128 mul0 = _mm_mul_ps(q1.Data, _mm_shuffle_ps(q2.Data, q2.Data, _MM_SHUFFLE(0, 1, 2, 3)));
__m128 mul1 = _mm_mul_ps(q1.Data, _mm_shuffle_ps(q2.Data, q2.Data, _MM_SHUFFLE(1, 0, 3, 2)));
__m128 mul2 = _mm_mul_ps(q1.Data, _mm_shuffle_ps(q2.Data, q2.Data, _MM_SHUFFLE(2, 3, 0, 1)));
__m128 mul3 = _mm_mul_ps(q1.Data, q2.Data);
# if((GLM_ARCH & GLM_ARCH_SSE4))
__m128 add0 = _mm_dp_ps(mul0, _mm_set_ps(1.0f, -1.0f, -1.0f, -1.0f), 0xff);
__m128 add1 = _mm_dp_ps(mul1, _mm_set_ps(1.0f, -1.0f, 1.0f, 1.0f), 0xff);
__m128 add2 = _mm_dp_ps(mul2, _mm_set_ps(1.0f, 1.0f, 1.0f, -1.0f), 0xff);
__m128 add3 = _mm_dp_ps(mul3, _mm_set_ps(1.0f, 1.0f, -1.0f, 1.0f), 0xff);
__m128 add0 = _mm_dp_ps(mul0, _mm_set_ps(1.0f, -1.0f, 1.0f, 1.0f), 0xff);
__m128 add1 = _mm_dp_ps(mul1, _mm_set_ps(1.0f, 1.0f, 1.0f, -1.0f), 0xff);
__m128 add2 = _mm_dp_ps(mul2, _mm_set_ps(1.0f, 1.0f, -1.0f, 1.0f), 0xff);
__m128 add3 = _mm_dp_ps(mul3, _mm_set_ps(1.0f, -1.0f, -1.0f, -1.0f), 0xff);
# else
mul0 = _mm_mul_ps(mul0, _mm_set_ps(1.0f, -1.0f, -1.0f, -1.0f));
mul0 = _mm_mul_ps(mul0, _mm_set_ps(1.0f, -1.0f, 1.0f, 1.0f));
__m128 add0 = _mm_add_ps(mul0, _mm_movehl_ps(mul0, mul0));
add0 = _mm_add_ss(add0, _mm_shuffle_ps(add0, add0, 1));
mul1 = _mm_mul_ps(mul1, _mm_set_ps(1.0f, -1.0f, 1.0f, 1.0f));
mul1 = _mm_mul_ps(mul1, _mm_set_ps(1.0f, 1.0f, 1.0f, -1.0f));
__m128 add1 = _mm_add_ps(mul1, _mm_movehl_ps(mul1, mul1));
add1 = _mm_add_ss(add1, _mm_shuffle_ps(add1, add1, 1));
mul2 = _mm_mul_ps(mul2, _mm_set_ps(1.0f, 1.0f, 1.0f, -1.0f));
mul2 = _mm_mul_ps(mul2, _mm_set_ps(1.0f, 1.0f, -1.0f, 1.0f));
__m128 add2 = _mm_add_ps(mul2, _mm_movehl_ps(mul2, mul2));
add2 = _mm_add_ss(add2, _mm_shuffle_ps(add2, add2, 1));
mul3 = _mm_mul_ps(mul3, _mm_set_ps(1.0f, 1.0f, -1.0f, 1.0f));
mul3 = _mm_mul_ps(mul3, _mm_set_ps(1.0f, -1.0f, -1.0f, -1.0f));
__m128 add3 = _mm_add_ps(mul3, _mm_movehl_ps(mul3, mul3));
add3 = _mm_add_ss(add3, _mm_shuffle_ps(add3, add3, 1));
#endif
// I had tried something clever here using shuffles to produce the final result, but it turns out that using
// _mm_store_* is consistently quicker in my tests. I've kept the shuffling code below just in case.
float w;
// This SIMD code is a politically correct way of doing this, but in every test I've tried it has been slower than
// the final code below. I'll keep this here for reference - maybe somebody else can do something better...
//
//__m128 xxyy = _mm_shuffle_ps(add0, add1, _MM_SHUFFLE(0, 0, 0, 0));
//__m128 zzww = _mm_shuffle_ps(add2, add3, _MM_SHUFFLE(0, 0, 0, 0));
//
//return _mm_shuffle_ps(xxyy, zzww, _MM_SHUFFLE(2, 0, 2, 0));
float x;
float y;
float z;
float w;
_mm_store_ss(&w, add0);
_mm_store_ss(&x, add1);
_mm_store_ss(&y, add2);
_mm_store_ss(&z, add3);
_mm_store_ss(&x, add0);
_mm_store_ss(&y, add1);
_mm_store_ss(&z, add2);
_mm_store_ss(&w, add3);
return detail::fquatSIMD(w, x, y, z);
//return _mm_shuffle_ps(_mm_shuffle_ps(add1, add2, 0),
// _mm_shuffle_ps(add3, add0, 0),
// _MM_SHUFFLE(2, 0, 2, 0));
}
GLM_FUNC_QUALIFIER fvec4SIMD operator* (fquatSIMD const & q, fvec4SIMD const & v)