mirror of
https://gitlab.freedesktop.org/mesa/mesa.git
synced 2026-05-23 19:28:11 +02:00
6548d01b3d
mir_constant_float() assumes we're dealing with 32-bit integers/floats, which is only the case if reg_mode is equal to midgard_reg_mode_32. Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com> Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3478>
83 lines
2.9 KiB
C
83 lines
2.9 KiB
C
/*
|
|
* 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;
|
|
}
|