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vec4: optimize vec4 normalize with SIMD

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This commit is contained in:
Recep Aslantas
2018-04-13 11:01:07 +03:00
parent 44728c536b
commit 0eb37da8bb
4 changed files with 66 additions and 22 deletions
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48
include/cglm/vec4.h
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@@ -312,26 +312,6 @@ glm_vec4_inv_to(vec4 v, vec4 dest) {
glm_vec4_flipsign(dest);
}
/*!
* @brief normalize vec4 and store result in same vec
*
* @param[in, out] v vector
*/
CGLM_INLINE
void
glm_vec4_normalize(vec4 v) {
float norm;
norm = glm_vec4_norm(v);
if (norm == 0.0f) {
v[0] = v[1] = v[2] = v[3] = 0.0f;
return;
}
glm_vec4_scale(v, 1.0f / norm, v);
}
/*!
* @brief normalize vec4 to dest
*
@@ -341,16 +321,44 @@ glm_vec4_normalize(vec4 v) {
CGLM_INLINE
void
glm_vec4_normalize_to(vec4 vec, vec4 dest) {
#if defined( __SSE__ ) || defined( __SSE2__ )
__m128 xdot, x0;
float dot;
x0 = _mm_load_ps(vec);
xdot = glm_simd_dot(x0, x0);
dot = _mm_cvtss_f32(xdot);
if (dot == 0.0f) {
_mm_store_ps(dest, _mm_setzero_ps());
return;
}
_mm_store_ps(dest, _mm_div_ps(x0, _mm_sqrt_ps(xdot)));
#else
float norm;
norm = glm_vec4_norm(vec);
if (norm == 0.0f) {
dest[0] = dest[1] = dest[2] = dest[3] = 0.0f;
glm_vec4_broadcast(0.0f, dest);
return;
}
glm_vec4_scale(vec, 1.0f / norm, dest);
#endif
}
/*!
* @brief normalize vec4 and store result in same vec
*
* @param[in, out] v vector
*/
CGLM_INLINE
void
glm_vec4_normalize(vec4 v) {
glm_vec4_normalize_to(v, v);
}
/**