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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 "nir.h"
#include "nir_builder.h"
/*
* lowers:
*
* packDouble2x32(foo) -> packDouble2x32Split(foo.x, foo.y)
* unpackDouble2x32(foo) -> vec2(unpackDouble2x32_x(foo), unpackDouble2x32_y(foo))
* packInt2x32(foo) -> packInt2x32Split(foo.x, foo.y)
* unpackInt2x32(foo) -> vec2(unpackInt2x32_x(foo), unpackInt2x32_y(foo))
*/
static nir_ssa_def *
lower_pack_64(nir_builder *b, nir_ssa_def *src)
{
return nir_pack_64_2x32_split(b, nir_channel(b, src, 0),
nir_channel(b, src, 1));
}
static nir_ssa_def *
lower_unpack_64(nir_builder *b, nir_ssa_def *src)
{
return nir_vec2(b, nir_unpack_64_2x32_split_x(b, src),
nir_unpack_64_2x32_split_y(b, src));
}
static void
lower_double_pack_impl(nir_function_impl *impl)
{
nir_builder b;
nir_builder_init(&b, impl);
nir_foreach_block(block, impl) {
nir_foreach_instr_safe(instr, block) {
if (instr->type != nir_instr_type_alu)
continue;
nir_alu_instr *alu_instr = (nir_alu_instr *) instr;
if (alu_instr->op != nir_op_pack_64_2x32 &&
alu_instr->op != nir_op_unpack_64_2x32)
continue;
b.cursor = nir_before_instr(&alu_instr->instr);
nir_ssa_def *src = nir_ssa_for_alu_src(&b, alu_instr, 0);
nir_ssa_def *dest;
switch (alu_instr->op) {
case nir_op_pack_64_2x32:
dest = lower_pack_64(&b, src);
break;
case nir_op_unpack_64_2x32:
dest = lower_unpack_64(&b, src);
break;
default:
unreachable("Impossible opcode");
}
nir_ssa_def_rewrite_uses(&alu_instr->dest.dest.ssa, nir_src_for_ssa(dest));
nir_instr_remove(&alu_instr->instr);
}
}
}
void
nir_lower_double_pack(nir_shader *shader)
{
nir_foreach_function(function, shader) {
if (function->impl)
lower_double_pack_impl(function->impl);
}
}
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