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Commit 48291b4d authored by James Willis's avatar James Willis
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Added a kernel_eval that finds dW_dx with 2 vectors.

parent b84a9701
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src/kernel_hydro.h
View file @ 48291b4d
......@@ -473,7 +473,6 @@ __attribute__((always_inline)) INLINE static void kernel_deval_1_vec(
/* Form a mask for each part of the kernel. */
mask_reg1.v = vec_cmp_lt(x.v, cond.v); /* 0 < x < 0.5 */
mask_reg2.v = vec_cmp_gte(x.v, cond.v); /* 0.5 < x < 1 */
;
/* Work out w for both regions of the kernel and combine the results together
* using masks. */
......@@ -586,9 +585,7 @@ __attribute__((always_inline)) INLINE static void kernel_deval_2_vec(
mask_reg1.v = vec_cmp_lt(x.v, cond.v); /* 0 < x < 0.5 */
mask_reg1_v2.v = vec_cmp_lt(x2.v, cond.v); /* 0 < x < 0.5 */
mask_reg2.v = vec_cmp_gte(x.v, cond.v); /* 0.5 < x < 1 */
;
mask_reg2_v2.v = vec_cmp_gte(x2.v, cond.v); /* 0.5 < x < 1 */
;
/* Work out w for both regions of the kernel and combine the results together
* using masks. */
......@@ -676,12 +673,11 @@ __attribute__((always_inline)) INLINE static void kernel_eval_W_vec(vector *u,
w->v = vec_fma(x.v, w->v, wendland_const_c5.v);
#elif defined(CUBIC_SPLINE_KERNEL)
vector w2;
vector mask1, mask2;
vector mask_reg1, mask_reg2;
/* Form a mask for each part of the kernel. */
mask1.v = vec_cmp_lt(x.v, cond.v); /* 0 < x < 0.5 */
mask2.v = vec_cmp_gte(x.v, cond.v); /* 0.5 < x < 1 */
;
mask_reg1.v = vec_cmp_lt(x.v, cond.v); /* 0 < x < 0.5 */
mask_reg2.v = vec_cmp_gte(x.v, cond.v); /* 0.5 < x < 1 */
/* Work out w for both regions of the kernel and combine the results together
* using masks. */
......@@ -698,8 +694,8 @@ __attribute__((always_inline)) INLINE static void kernel_eval_W_vec(vector *u,
w2.v = vec_fma(x.v, w2.v, cubic_2_const_c3.v);
/* Mask out unneeded values. */
w->v = vec_and(w->v, mask1.v);
w2.v = vec_and(w2.v, mask2.v);
w->v = vec_and(w->v, mask_reg1.v);
w2.v = vec_and(w2.v, mask_reg2.v);
/* Added both w and w2 together to form complete result. */
w->v = vec_add(w->v, w2.v);
......@@ -741,12 +737,11 @@ __attribute__((always_inline)) INLINE static void kernel_eval_dWdx_vec(
#elif defined(CUBIC_SPLINE_KERNEL)
vector dw_dx2;
vector mask1, mask2;
vector mask_reg1, mask_reg2;
/* Form a mask for each part of the kernel. */
mask1.v = vec_cmp_lt(x.v, cond.v); /* 0 < x < 0.5 */
mask2.v = vec_cmp_gte(x.v, cond.v); /* 0.5 < x < 1 */
;
mask_reg1.v = vec_cmp_lt(x.v, cond.v); /* 0 < x < 0.5 */
mask_reg2.v = vec_cmp_gte(x.v, cond.v); /* 0.5 < x < 1 */
/* Work out w for both regions of the kernel and combine the results together
* using masks. */
......@@ -760,8 +755,8 @@ __attribute__((always_inline)) INLINE static void kernel_eval_dWdx_vec(
dw_dx2.v = vec_fma(dw_dx2.v, x.v, cubic_2_dwdx_const_c2.v);
/* Mask out unneeded values. */
dw_dx->v = vec_and(dw_dx->v, mask1.v);
dw_dx2.v = vec_and(dw_dx2.v, mask2.v);
dw_dx->v = vec_and(dw_dx->v, mask_reg1.v);
dw_dx2.v = vec_and(dw_dx2.v, mask_reg2.v);
/* Added both dwdx and dwdx2 together to form complete result. */
dw_dx->v = vec_add(dw_dx->v, dw_dx2.v);
......@@ -774,6 +769,156 @@ __attribute__((always_inline)) INLINE static void kernel_eval_dWdx_vec(
kernel_gamma_inv_dim_plus_one_vec.v));
}
/**
* @brief Computes the kernel function derivative for two particles
* using vectors.
*
* Return 0 if $u > \\gamma = H/h$
*
* @param u The ratio of the distance to the smoothing length $u = x/h$.
* @param dw_dx (return) The norm of the gradient of $|\\nabla W(x,h)|$.
*/
__attribute__((always_inline)) INLINE static void kernel_eval_dWdx_force_vec(
vector *u, vector *dw_dx) {
/* Go to the range [0,1[ from [0,H[ */
vector x;
x.v = vec_mul(u->v, kernel_gamma_inv_vec.v);
#ifdef WENDLAND_C2_KERNEL
/* Init the iteration for Horner's scheme. */
dw_dx->v = vec_fma(wendland_dwdx_const_c0.v, x.v, wendland_dwdx_const_c1.v);
/* Calculate the polynomial interleaving vector operations */
dw_dx->v = vec_fma(dw_dx->v, x.v, wendland_dwdx_const_c2.v);
dw_dx->v = vec_fma(dw_dx->v, x.v, wendland_dwdx_const_c3.v);
dw_dx->v = vec_mul(dw_dx->v, x.v);
#elif defined(CUBIC_SPLINE_KERNEL)
vector dw_dx2;
vector mask_reg1, mask_reg2;
/* Form a mask for each part of the kernel. */
mask_reg1.v = vec_cmp_lt(x.v, cond.v); /* 0 < x < 0.5 */
mask_reg2.v = vec_cmp_gte(x.v, cond.v); /* 0.5 < x < 1 */
/* Work out w for both regions of the kernel and combine the results together
* using masks. */
/* Init the iteration for Horner's scheme. */
dw_dx->v = vec_fma(cubic_1_dwdx_const_c0.v, x.v, cubic_1_dwdx_const_c1.v);
dw_dx2.v = vec_fma(cubic_2_dwdx_const_c0.v, x.v, cubic_2_dwdx_const_c1.v);
/* Calculate the polynomial interleaving vector operations. */
dw_dx->v = vec_mul(dw_dx->v, x.v); /* cubic_1_dwdx_const_c2 is zero. */
dw_dx2.v = vec_fma(dw_dx2.v, x.v, cubic_2_dwdx_const_c2.v);
/* Mask out unneeded values. */
dw_dx->v = vec_and(dw_dx->v, mask_reg1.v);
dw_dx2.v = vec_and(dw_dx2.v, mask_reg2.v);
/* Added both dwdx and dwdx2 together to form complete result. */
dw_dx->v = vec_add(dw_dx->v, dw_dx2.v);
#else
#error
#endif
vector mask;
mask.v = vec_cmp_lt(x.v,vec_set1(1.f));
dw_dx->v = vec_and(dw_dx->v,mask.v);
/* Return everything */
dw_dx->v = vec_mul(dw_dx->v, vec_mul(kernel_constant_vec.v,
kernel_gamma_inv_dim_plus_one_vec.v));
}
/**
* @brief Computes the kernel function derivative for two particles
* using vectors.
*
* Return 0 if $u > \\gamma = H/h$
*
* @param u The ratio of the distance to the smoothing length $u = x/h$.
* @param dw_dx (return) The norm of the gradient of $|\\nabla W(x,h)|$.
*/
__attribute__((always_inline)) INLINE static void kernel_eval_dWdx_force_2_vec(
vector *u, vector *dw_dx, vector *u_2, vector *dw_dx_2) {
/* Go to the range [0,1[ from [0,H[ */
vector x, x_2;
x.v = vec_mul(u->v, kernel_gamma_inv_vec.v);
x_2.v = vec_mul(u_2->v, kernel_gamma_inv_vec.v);
#ifdef WENDLAND_C2_KERNEL
/* Init the iteration for Horner's scheme. */
dw_dx->v = vec_fma(wendland_dwdx_const_c0.v, x.v, wendland_dwdx_const_c1.v);
dw_dx_2->v = vec_fma(wendland_dwdx_const_c0.v, x_2.v, wendland_dwdx_const_c1.v);
/* Calculate the polynomial interleaving vector operations */
dw_dx->v = vec_fma(dw_dx->v, x.v, wendland_dwdx_const_c2.v);
dw_dx_2->v = vec_fma(dw_dx_2->v, x_2.v, wendland_dwdx_const_c2.v);
dw_dx->v = vec_fma(dw_dx->v, x.v, wendland_dwdx_const_c3.v);
dw_dx_2->v = vec_fma(dw_dx_2->v, x_2.v, wendland_dwdx_const_c3.v);
dw_dx->v = vec_mul(dw_dx->v, x.v);
dw_dx_2->v = vec_mul(dw_dx_2->v, x_2.v);
#elif defined(CUBIC_SPLINE_KERNEL)
vector dw_dx2, dw_dx2_2;
vector mask_reg1, mask_reg2;
vector mask_reg1_2, mask_reg2_2;
/* Form a mask for each part of the kernel. */
mask_reg1.v = vec_cmp_lt(x.v, cond.v); /* 0 < x < 0.5 */
mask_reg1_2.v = vec_cmp_lt(x_2.v, cond.v); /* 0 < x < 0.5 */
mask_reg2.v = vec_cmp_gte(x.v, cond.v); /* 0.5 < x < 1 */
mask_reg2_2.v = vec_cmp_gte(x_2.v, cond.v); /* 0.5 < x < 1 */
/* Work out w for both regions of the kernel and combine the results together
* using masks. */
/* Init the iteration for Horner's scheme. */
dw_dx->v = vec_fma(cubic_1_dwdx_const_c0.v, x.v, cubic_1_dwdx_const_c1.v);
dw_dx_2->v = vec_fma(cubic_1_dwdx_const_c0.v, x_2.v, cubic_1_dwdx_const_c1.v);
dw_dx2.v = vec_fma(cubic_2_dwdx_const_c0.v, x.v, cubic_2_dwdx_const_c1.v);
dw_dx2_2.v = vec_fma(cubic_2_dwdx_const_c0.v, x_2.v, cubic_2_dwdx_const_c1.v);
/* Calculate the polynomial interleaving vector operations. */
dw_dx->v = vec_mul(dw_dx->v, x.v); /* cubic_1_dwdx_const_c2 is zero. */
dw_dx_2->v = vec_mul(dw_dx_2->v, x_2.v); /* cubic_1_dwdx_const_c2 is zero. */
dw_dx2.v = vec_fma(dw_dx2.v, x.v, cubic_2_dwdx_const_c2.v);
dw_dx2_2.v = vec_fma(dw_dx2_2.v, x_2.v, cubic_2_dwdx_const_c2.v);
/* Mask out unneeded values. */
dw_dx->v = vec_and(dw_dx->v, mask_reg1.v);
dw_dx_2->v = vec_and(dw_dx_2->v, mask_reg1_2.v);
dw_dx2.v = vec_and(dw_dx2.v, mask_reg2.v);
dw_dx2_2.v = vec_and(dw_dx2_2.v, mask_reg2_2.v);
/* Added both dwdx and dwdx2 together to form complete result. */
dw_dx->v = vec_add(dw_dx->v, dw_dx2.v);
dw_dx_2->v = vec_add(dw_dx_2->v, dw_dx2_2.v);
#else
#error
#endif
vector mask, mask_2;
mask.v = vec_cmp_lt(x.v,vec_set1(1.f));
mask_2.v = vec_cmp_lt(x_2.v,vec_set1(1.f));
dw_dx->v = vec_and(dw_dx->v,mask.v);
dw_dx_2->v = vec_and(dw_dx_2->v,mask_2.v);
/* Return everything */
dw_dx->v = vec_mul(dw_dx->v, vec_mul(kernel_constant_vec.v,
kernel_gamma_inv_dim_plus_one_vec.v));
dw_dx_2->v = vec_mul(dw_dx_2->v, vec_mul(kernel_constant_vec.v,
kernel_gamma_inv_dim_plus_one_vec.v));
}
#endif /* WITH_VECTORIZATION */
/* Some cross-check functions */
......
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