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/*
* Copyright © 2015 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "anv_nir.h"
struct lower_push_constants_state {
nir_shader *shader;
bool is_scalar;
};
static bool
lower_push_constants_block(nir_block *block, void *void_state)
{
struct lower_push_constants_state *state = void_state;
nir_foreach_instr(block, instr) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
/* TODO: Handle indirect push constants */
if (intrin->intrinsic != nir_intrinsic_load_push_constant)
continue;
assert(intrin->const_index[0] % 4 == 0);
unsigned dword_offset = intrin->const_index[0] / 4;
/* We just turn them into uniform loads with the appropreate offset */
intrin->intrinsic = nir_intrinsic_load_uniform;
intrin->const_index[0] = 0;
if (state->is_scalar) {
intrin->const_index[1] = dword_offset;
} else {
unsigned shift = dword_offset % 4;
/* Can't cross the vec4 boundary */
assert(shift + intrin->num_components <= 4);
/* vec4 shifts are in units of vec4's */
intrin->const_index[1] = dword_offset / 4;
if (shift) {
/* If there's a non-zero shift then we need to load a whole vec4
* and use a move to swizzle it into place.
*/
assert(intrin->dest.is_ssa);
nir_alu_instr *mov = nir_alu_instr_create(state->shader,
nir_op_imov);
mov->src[0].src = nir_src_for_ssa(&intrin->dest.ssa);
for (unsigned i = 0; i < intrin->num_components; i++)
mov->src[0].swizzle[i] = i + shift;
mov->dest.write_mask = (1 << intrin->num_components) - 1;
nir_ssa_dest_init(&mov->instr, &mov->dest.dest,
intrin->num_components, NULL);
nir_ssa_def_rewrite_uses(&intrin->dest.ssa,
nir_src_for_ssa(&mov->dest.dest.ssa));
nir_instr_insert_after(&intrin->instr, &mov->instr);
/* Stomp the number of components to 4 */
intrin->num_components = 4;
intrin->dest.ssa.num_components = 4;
}
}
}
return true;
}
void
anv_nir_lower_push_constants(nir_shader *shader, bool is_scalar)
{
struct lower_push_constants_state state = {
.shader = shader,
.is_scalar = is_scalar,
};
nir_foreach_overload(shader, overload) {
if (overload->impl)
nir_foreach_block(overload->impl, lower_push_constants_block, &state);
}
assert(shader->num_uniforms % 4 == 0);
if (is_scalar)
shader->num_uniforms /= 4;
else
shader->num_uniforms = DIV_ROUND_UP(shader->num_uniforms, 16);
}
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