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package gfx;
localparam int SHADER_LANES = 4;
typedef logic[31:0] word;
typedef logic[63:0] dword;
localparam int SUBWORD_BITS = $clog2($bits(word)) - $clog2($bits(byte));
localparam int BYTES_PER_WORD = 1 << SUBWORD_BITS;
typedef logic[7:0] float_exp;
typedef logic[$bits(word) - $bits(float_exp) - 2:0] float_mant;
typedef logic[$bits(float_mant):0] float_mant_full; // Incluye '1.' explícito
typedef logic[$bits(float_mant_full) + 1:0] float_mant_ext; // Considera overflow
localparam float_exp FLOAT_EXP_BIAS = (1 << ($bits(float_exp) - 1)) - 1;
localparam float_exp FLOAT_EXP_MAX = {($bits(float_exp)){1'b1}};
function float_mant_full full_mant(float_mant in);
full_mant = {1'b1, in};
endfunction
function float_mant implicit_mant(float_mant_full in);
assert (in[$bits(in) - 1]);
implicit_mant = in[$bits(in) - 2:0];
endfunction
typedef struct packed
{
logic sign;
float_exp exp;
float_mant mant;
} float;
/* Explicación de guard, round, sticky:
* https://drilian.com/2023/01/10/floating-point-numbers-and-rounding/
*/
typedef struct packed
{
float normal;
logic slow,
zero,
guard,
round,
sticky;
} float_round;
typedef struct packed
{
logic exp_max,
exp_min,
mant_zero;
} float_class;
function float_class classify_float(float in);
classify_float.exp_max = &in.exp;
classify_float.exp_min = ~|in.exp;
classify_float.mant_zero = ~|in.mant;
endfunction
function logic is_float_special(float_class in);
is_float_special = in.exp_max | (in.exp_min & ~in.mant_zero);
endfunction
function float_mant_ext float_prepare_round(float in, float_class in_class);
float_prepare_round = {~in_class.exp_min, in.mant, 2'b00};
endfunction
// -> 4,4,4,4,4,4,4,4 -> 8,8,8,8 -> 16,16 -> 32
localparam int FPINT_CLZ_STAGES = 4;
localparam int FPINT_STAGES = 7 + FPINT_CLZ_STAGES + 4;
localparam bit[$clog2($bits(float_mant_ext)):0] FPINT_MAX_SHIFT
= 1 << $clog2($bits(float_mant_ext));
typedef logic[$clog2(FPINT_MAX_SHIFT):0] fpint_shift;
typedef struct packed
{
logic setup_mul_float,
setup_unit_b,
mnorm_put_hi,
mnorm_put_lo,
mnorm_put_mul,
mnorm_zero_b,
mnorm_zero_flags,
minmax_copy_flags,
shiftr_int_signed,
addsub_copy_flags,
addsub_int_operand,
clz_force_nop,
shiftl_copy_flags,
round_copy_flags,
round_enable,
encode_enable;
} fpint_op;
typedef struct packed
{
float a,
b,
a_mul,
b_mul;
} fpint_setup_mulclass;
typedef struct packed
{
float b;
float_exp exp;
float_class a_class,
b_class;
dword product;
logic sign,
overflow;
} fpint_mulclass_mnorm;
typedef struct packed
{
float a,
b;
float_class a_class,
b_class;
logic slow,
zero,
guard,
round,
sticky,
slow_in,
overflow;
} fpint_mnorm_minmax;
typedef struct packed
{
float max,
min;
float_class max_class,
min_class;
logic slow,
zero,
guard,
round,
sticky;
} fpint_minmax_expdiff;
typedef struct packed
{
float max,
min;
float_class max_class,
min_class;
fpint_shift exp_shift;
logic slow,
zero,
guard,
round,
sticky;
} fpint_expdiff_shiftr;
typedef struct packed
{
float max,
min;
float_class max_class,
min_class;
float_mant_ext max_mant,
min_mant,
sticky_mask;
logic slow,
zero,
guard,
round,
sticky,
int_sign;
} fpint_shiftr_addsub;
typedef struct packed
{
float max;
word add_sub;
logic slow,
zero,
guard,
round,
sticky;
} fpint_clz_hold;
typedef fpint_clz_hold fpint_addsub_clz;
typedef struct packed
{
fpint_clz_hold hold;
fpint_shift shift;
} fpint_clz_shiftl;
typedef struct packed
{
float val;
logic slow,
zero,
guard,
round,
sticky,
overflow,
sticky_last;
} fpint_shiftl_round;
typedef struct packed
{
float val;
logic slow,
zero,
exp_step,
overflow;
} fpint_round_rnorm;
typedef struct packed
{
float val;
logic slow,
zero,
overflow;
} fpint_rnorm_encode;
localparam int SCHED_BRAM_WORDS = 2048; // 8KiB
typedef word irq_lines;
endpackage
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