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/*
* Copyright (C) 2019 Collabora, Ltd.
*
* 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.
*
* Authors (Collabora):
* Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
*/
#include "compiler.h"
#include "midgard_ops.h"
#include <math.h>
/* Could a 32-bit value represent exactly a 32-bit floating point? */
static bool
mir_constant_float(uint32_t u)
{
/* Cast */
float f = 0;
memcpy(&f, &u, sizeof(u));
/* TODO: What exactly is the condition? */
return !(isnan(f) || isinf(f));
}
/* Promotes imov with a constant to fmov where the constant is exactly
* representible as a float */
bool
midgard_opt_promote_fmov(compiler_context *ctx, midgard_block *block)
{
bool progress = false;
mir_foreach_instr_in_block(block, ins) {
if (ins->type != TAG_ALU_4) continue;
if (ins->alu.op != midgard_alu_op_imov) continue;
if (ins->has_inline_constant) continue;
if (!ins->has_constants) continue;
if (mir_nontrivial_source2_mod_simple(ins)) continue;
if (mir_nontrivial_outmod(ins)) continue;
if (ins->alu.reg_mode != midgard_reg_mode_32) continue;
/* We found an imov with a constant. Check the constants */
bool ok = true;
for (unsigned i = 0; i < ARRAY_SIZE(ins->constants.u32); ++i)
ok &= mir_constant_float(ins->constants.u32[i]);
if (!ok)
continue;
/* Rewrite to fmov */
ins->alu.op = midgard_alu_op_fmov;
ins->alu.outmod = 0;
/* Clear the int mod */
midgard_vector_alu_src u = vector_alu_from_unsigned(ins->alu.src2);
u.mod = 0;
ins->alu.src2 = vector_alu_srco_unsigned(u);
progress |= true;
}
return progress;
}
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