Commit 8e52206d authored by Alyssa Rosenzweig's avatar Alyssa Rosenzweig 💜
Browse files

pan/bi: Add fexp2 implementation


Signed-off-by: Alyssa Rosenzweig's avatarAlyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <mesa/mesa!4615>
parent b1d4d8f7
......@@ -5,6 +5,7 @@ bifrost_FILES := \
bifrost/bi_lower_combine.c \
bifrost/bi_tables.c \
bifrost/bi_schedule.c \
bifrost/bi_special.c \
bifrost/bi_print.c \
bifrost/bi_print.h \
bifrost/bi_quirks.h \
......
/*
* Copyright (C) 2020 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"
/* Bifrost requires special functions to be lowered in various machine specific
* ways. The routines in this file are used in codegen for this. */
/* New Bifrost has a FEXP2_FAST instruction but requires an auxiliary
* parameter. */
static void
bi_emit_fexp2_new(bi_context *ctx, nir_alu_instr *instr)
{
/* FMA_MSCALE T, X, 1.0, 0, 0x18 */
bi_instruction mscale = {
.type = BI_FMA,
.op = { .mscale = true },
.dest = bi_make_temp(ctx),
.dest_type = nir_type_float32,
.writemask = 0xF,
.src = {
bir_src_index(&instr->src[0].src),
BIR_INDEX_CONSTANT | 0,
BIR_INDEX_ZERO,
BIR_INDEX_CONSTANT | 32,
},
.src_types = {
nir_type_float32,
nir_type_float32,
nir_type_float32,
nir_type_int32,
},
.constant = {
/* 0x3f80000000 = 1.0f as fp32
* 24 = shift to multiply by 2^24 */
.u64 = (0x3f800000) | (24ull << 32)
}
};
/* F2I_RTE T, T */
bi_instruction f2i = {
.type = BI_CONVERT,
.dest = bi_make_temp(ctx),
.dest_type = nir_type_int32,
.writemask = 0xF,
.src = { mscale.dest },
.src_types = { nir_type_float32 },
.roundmode = BIFROST_RTE
};
/* FEXP2_FAST T, T, X */
bi_instruction fexp = {
.type = BI_SPECIAL,
.op = { .special = BI_SPECIAL_EXP2_LOW },
.dest = bir_dest_index(&instr->dest.dest),
.dest_type = nir_type_float32,
.writemask = 0xF,
.src = { f2i.dest, mscale.src[0] },
.src_types = { nir_type_int32, nir_type_float32 },
};
bi_emit(ctx, mscale);
bi_emit(ctx, f2i);
bi_emit(ctx, fexp);
}
void
bi_emit_fexp2(bi_context *ctx, nir_alu_instr *instr)
{
/* TODO: G71 */
bi_emit_fexp2_new(ctx, instr);
}
......@@ -526,7 +526,16 @@ bi_fuse_csel_cond(bi_instruction *csel, nir_alu_src cond,
static void
emit_alu(bi_context *ctx, nir_alu_instr *instr)
{
/* Assume it's something we can handle normally */
/* Try some special functions */
switch (instr->op) {
case nir_op_fexp2:
bi_emit_fexp2(ctx, instr);
return;
default:
break;
}
/* Otherwise, assume it's something we can handle normally */
bi_instruction alu = {
.type = bi_class_for_nir_alu(instr->op),
.dest = bir_dest_index(&instr->dest.dest),
......
......@@ -558,6 +558,10 @@ pan_next_block(pan_block *block)
return list_first_entry(&(block->link), pan_block, link);
}
/* Special functions */
void bi_emit_fexp2(bi_context *ctx, nir_alu_instr *instr);
/* BIR manipulation */
bool bi_has_outmod(bi_instruction *ins);
......
......@@ -28,6 +28,7 @@ libpanfrost_bifrost_files = files(
'bi_pack.c',
'bi_ra.c',
'bi_schedule.c',
'bi_special.c',
'bi_tables.c',
'bir.c',
'bifrost_compile.c',
......
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