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/*
* Copyright 2023 Valve Corporation
* Copyright 2014 Connor Abbott
* SPDX-License-Identifier: MIT
*/
#ifndef NIR_LEGACY_H
#define NIR_LEGACY_H
#include "nir.h"
typedef struct {
nir_def *handle;
/** NULL for no indirect offset */
nir_def *indirect;
unsigned base_offset;
} nir_reg_src;
typedef struct {
nir_def *handle;
/** NULL for no indirect offset */
nir_def *indirect;
unsigned base_offset;
} nir_reg_dest;
typedef struct {
bool is_ssa;
union {
nir_reg_src reg;
nir_def *ssa;
};
} nir_legacy_src;
typedef struct {
bool is_ssa;
union {
nir_reg_dest reg;
nir_def *ssa;
};
} nir_legacy_dest;
typedef struct {
/* Base source */
nir_legacy_src src;
/* For inputs interpreted as floating point, flips the sign bit. */
bool fneg;
/* Clears the sign bit for floating point values, Note that the negate
* modifier acts after the absolute value modifier, therefore if both are set
* then all inputs will become negative.
*/
bool fabs;
uint8_t swizzle[NIR_MAX_VEC_COMPONENTS];
} nir_legacy_alu_src;
typedef struct {
/* Base destination */
nir_legacy_dest dest;
nir_component_mask_t write_mask;
/**
* Saturate output modifier
*
* Only valid for opcodes that output floating-point numbers. Clamps the
* output to between 0.0 and 1.0 inclusive.
*/
bool fsat;
} nir_legacy_alu_dest;
/* Prepare shader for use with legacy helpers. Must call on final NIR. */
bool nir_legacy_trivialize(nir_shader *s, bool fuse_fabs);
/* Reconstruct a legacy source/destination (including registers) */
nir_legacy_src nir_legacy_chase_src(const nir_src *src);
nir_legacy_dest nir_legacy_chase_dest(nir_def *def);
/* Reconstruct a legacy ALU source/destination (including float modifiers) */
nir_legacy_alu_src nir_legacy_chase_alu_src(const nir_alu_src *src,
bool fuse_fabs);
nir_legacy_alu_dest nir_legacy_chase_alu_dest(nir_def *def);
/* Check if a source modifier folds. If so, it may be skipped during instruction
* selection, avoiding the need for backend dead code elimination.
*/
bool nir_legacy_float_mod_folds(nir_alu_instr *mod);
/* Check if an fsat destination modifier folds. If so, it must be skipped to
* avoid multiple conflicting writes to the same definition.
*/
bool nir_legacy_fsat_folds(nir_alu_instr *fsat);
#endif
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