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OpenFPGA/vpr/src/power/power_callibrate.cpp

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/*********************************************************************
* The following code is part of the power modelling feature of VTR.
*
* For support:
* http://code.google.com/p/vtr-verilog-to-routing/wiki/Power
*
* or email:
* vtr.power.estimation@gmail.com
*
* If you are using power estimation for your researach please cite:
*
* Jeffrey Goeders and Steven Wilton. VersaPower: Power Estimation
* for Diverse FPGA Architectures. In International Conference on
* Field Programmable Technology, 2012.
*
********************************************************************/
/* This file provides functions used to verify the power estimations
* againt SPICE.
*/
/************************* INCLUDES *********************************/
#include <iostream>
#include "vtr_assert.h"
#include "vtr_memory.h"
#include "power_callibrate.h"
#include "power_components.h"
#include "power_lowlevel.h"
#include "power_util.h"
#include "power_cmos_tech.h"
#include "globals.h"
/************************* FUNCTION DECLARATIONS ********************/
static char binary_not(char c);
/************************* FUNCTION DEFINITIONS *********************/
/* This function prints high-activitiy and zero-activity single-cycle
* energy estimations for a variety of components and sizes.
*/
void power_print_spice_comparison() {
//
t_power_usage sub_power_usage;
//
// float inv_sizes[5] = { 1, 8, 16, 32, 64 };
//
// float buffer_sizes[3] = { 16, 25, 64 };
//
unsigned int LUT_sizes[3] = {6};
//
// float sb_buffer_sizes[6] = { 9, 9, 16, 16, 25, 25 };
// unsigned int sb_mux_sizes[6] = { 4, 8, 12, 16, 20, 25 };
//
// unsigned int mux_sizes[5] = { 4, 8, 12, 16, 20 };
//
unsigned int i, j;
float* dens = nullptr;
float* prob = nullptr;
char* SRAM_bits = nullptr;
int sram_idx;
auto& power_ctx = g_vpr_ctx.mutable_power();
//
power_ctx.solution_inf.T_crit = 1.0e-8;
//
//
// fprintf(power_ctx.output->out, "Energy of INV (High Activity)\n");
// for (i = 0; i < (sizeof(inv_sizes) / sizeof(float)); i++) {
// power_usage_inverter(&sub_power_usage, 2, 0.5, inv_sizes[i],
// power_callib_period);
// fprintf(power_ctx.output->out, "%g\t%g\n", inv_sizes[i],
// (sub_power_usage.dynamic + sub_power_usage.leakage)
// * power_ctx.solution_inf.T_crit);
// }
//
// fprintf(power_ctx.output->out, "Energy of INV (No Activity)\n");
// for (i = 0; i < (sizeof(inv_sizes) / sizeof(float)); i++) {
// power_usage_inverter(&sub_power_usage, 0, 1, inv_sizes[i],
// power_callib_period);
// fprintf(power_ctx.output->out, "%g\t%g\n", inv_sizes[i],
// (sub_power_usage.dynamic + sub_power_usage.leakage)
// * power_ctx.solution_inf.T_crit);
// }
// }
//
// fprintf(power_ctx.output->out, "Energy of Mux (High Activity)\n");
// for (i = 0; i < (sizeof(mux_sizes) / sizeof(int)); i++) {
// t_power_usage mux_power_usage;
//
// power_zero_usage(&mux_power_usage);
//
// dens = (float*) vtr::realloc(dens, mux_sizes[i] * sizeof(float));
// prob = (float*) vtr::realloc(prob, mux_sizes[i] * sizeof(float));
// for (j = 0; j < mux_sizes[i]; j++) {
// dens[j] = 2;
// prob[j] = 0.5;
// }
// power_usage_mux_multilevel(&mux_power_usage,
// power_get_mux_arch(mux_sizes[i]), prob, dens, 0, false,
// power_callib_period);
// fprintf(power_ctx.output->out, "%d\t%g\n", mux_sizes[i],
// (mux_power_usage.dynamic + mux_power_usage.leakage)
// * power_ctx.solution_inf.T_crit);
// }
//
// fprintf(power_ctx.output->out, "Energy of Mux (No Activity)\n");
// for (i = 0; i < (sizeof(mux_sizes) / sizeof(int)); i++) {
// t_power_usage mux_power_usage;
//
// power_zero_usage(&mux_power_usage);
//
// dens = (float*) vtr::realloc(dens, mux_sizes[i] * sizeof(float));
// prob = (float*) vtr::realloc(prob, mux_sizes[i] * sizeof(float));
// for (j = 0; j < mux_sizes[i]; j++) {
// if (j == 0) {
// dens[j] = 0;
// prob[j] = 1;
// } else {
// dens[j] = 0;
// prob[j] = 0;
// }
// }
// power_usage_mux_multilevel(&mux_power_usage,
// power_get_mux_arch(mux_sizes[i]), prob, dens, 0, false,
// power_callib_period);
// fprintf(power_ctx.output->out, "%d\t%g\n", mux_sizes[i],
// (mux_power_usage.dynamic + mux_power_usage.leakage)
// * power_ctx.solution_inf.T_crit);
// }
//
// fprintf(power_ctx.output->out, "Energy of Buffer (High Activity)\n");
// for (i = 0; i < (sizeof(buffer_sizes) / sizeof(float)); i++) {
// power_usage_buffer(&sub_power_usage, buffer_sizes[i], 0.5, 2, false,
// power_callib_period);
// fprintf(power_ctx.output->out, "%g\t%g\n", buffer_sizes[i],
// (sub_power_usage.dynamic + sub_power_usage.leakage)
// * power_ctx.solution_inf.T_crit);
// }
//
// fprintf(power_ctx.output->out, "Energy of Buffer (No Activity)\n");
// for (i = 0; i < (sizeof(buffer_sizes) / sizeof(float)); i++) {
// power_usage_buffer(&sub_power_usage, buffer_sizes[i], 1, 0, false,
// power_callib_period);
// fprintf(power_ctx.output->out, "%g\t%g\n", buffer_sizes[i],
// (sub_power_usage.dynamic + sub_power_usage.leakage)
// * power_ctx.solution_inf.T_crit);
// }
//
fprintf(power_ctx.output->out, "Energy of LUT (High Activity)\n");
for (i = 0; i < (sizeof(LUT_sizes) / sizeof(int)); i++) {
for (j = 1; j <= LUT_sizes[i]; j++) {
SRAM_bits = (char*)vtr::realloc(SRAM_bits,
((1 << j) + 1) * sizeof(char));
if (j == 1) {
SRAM_bits[0] = '1';
SRAM_bits[1] = '0';
} else {
for (sram_idx = 0; sram_idx < (1 << (j - 1)); sram_idx++) {
SRAM_bits[sram_idx + (1 << (j - 1))] = binary_not(SRAM_bits[sram_idx]);
}
}
SRAM_bits[1 << j] = '\0';
}
dens = (float*)vtr::realloc(dens, LUT_sizes[i] * sizeof(float));
prob = (float*)vtr::realloc(prob, LUT_sizes[i] * sizeof(float));
for (j = 0; j < LUT_sizes[i]; j++) {
dens[j] = 1.0 / (float)LUT_sizes[i];
prob[j] = 0.5;
}
power_usage_lut(&sub_power_usage, LUT_sizes[i], 1.0, SRAM_bits, prob,
dens, power_callib_period);
t_power_usage power_usage_mux;
float p[6] = {0.5, 0.5, 0.5, 0.5, 0.5, 0.5};
float d[6] = {1, 1, 1, 1, 1, 1};
power_usage_mux_multilevel(&power_usage_mux, power_get_mux_arch(6, 1.0),
p, d, 0, true, power_ctx.solution_inf.T_crit);
power_add_usage(&sub_power_usage, &power_usage_mux);
fprintf(power_ctx.output->out, "%d\t%g\n", LUT_sizes[i],
power_sum_usage(&sub_power_usage));
}
//
// fprintf(power_ctx.output->out, "Energy of LUT (No Activity)\n");
// for (i = 0; i < (sizeof(LUT_sizes) / sizeof(int)); i++) {
// for (j = 1; j <= LUT_sizes[i]; j++) {
// SRAM_bits = (char*) vtr::realloc(SRAM_bits,
// ((1 << j) + 1) * sizeof(char));
// if (j == 1) {
// SRAM_bits[0] = '1';
// SRAM_bits[1] = '0';
// } else {
// for (sram_idx = 0; sram_idx < (1 << (j - 1)); sram_idx++) {
// SRAM_bits[sram_idx + (1 << (j - 1))] = binary_not(
// SRAM_bits[sram_idx]);
// }
// }
// SRAM_bits[1 << j] = '\0';
// }
//
// dens = (float*) vtr::realloc(dens, LUT_sizes[i] * sizeof(float));
// prob = (float*) vtr::realloc(prob, LUT_sizes[i] * sizeof(float));
// for (j = 0; j < LUT_sizes[i]; j++) {
// dens[j] = 0;
// prob[j] = 1;
// }
// power_usage_lut(&sub_power_usage, LUT_sizes[i], SRAM_bits, prob, dens,
// power_callib_period);
// fprintf(power_ctx.output->out, "%d\t%g\n", LUT_sizes[i],
// (sub_power_usage.dynamic + sub_power_usage.leakage)
// * power_ctx.solution_inf.T_crit * 2);
// }
//
fprintf(power_ctx.output->out, "Energy of FF (High Activity)\n");
power_usage_ff(&sub_power_usage, 1.0, 0.5, 3, 0.5, 1, 0.5, 2,
power_callib_period);
fprintf(power_ctx.output->out, "%g\n",
(sub_power_usage.dynamic + sub_power_usage.leakage));
//
// fprintf(power_ctx.output->out, "Energy of FF (No Activity)\n");
// power_usage_ff(&sub_power_usage, 1, 0, 1, 0, 1, 0, power_callib_period);
// fprintf(power_ctx.output->out, "%g\n",
// (sub_power_usage.dynamic + sub_power_usage.leakage)
// * power_ctx.solution_inf.T_crit * 2);
//
// fprintf(power_ctx.output->out, "Energy of SB (High Activity)\n");
// for (i = 0; i < (sizeof(sb_buffer_sizes) / sizeof(float)); i++) {
// t_power_usage sb_power_usage;
//
// power_zero_usage(&sb_power_usage);
//
// dens = (float*) vtr::realloc(dens, sb_mux_sizes[i] * sizeof(float));
// prob = (float*) vtr::realloc(prob, sb_mux_sizes[i] * sizeof(float));
// for (j = 0; j < sb_mux_sizes[i]; j++) {
// dens[j] = 2;
// prob[j] = 0.5;
// }
//
// power_usage_mux_multilevel(&sub_power_usage,
// power_get_mux_arch(sb_mux_sizes[i]), prob, dens, 0, true,
// power_callib_period);
// power_add_usage(&sb_power_usage, &sub_power_usage);
//
// power_usage_buffer(&sub_power_usage, sb_buffer_sizes[i], 0.5, 2, true,
// power_callib_period);
// power_add_usage(&sb_power_usage, &sub_power_usage);
//
// fprintf(power_ctx.output->out, "%d\t%.0f\t%g\n", sb_mux_sizes[i],
// sb_buffer_sizes[i],
// (sb_power_usage.dynamic + sb_power_usage.leakage)
// * power_ctx.solution_inf.T_crit);
// }
//
// fprintf(power_ctx.output->out, "Energy of SB (No Activity)\n");
// for (i = 0; i < (sizeof(sb_buffer_sizes) / sizeof(float)); i++) {
// t_power_usage sb_power_usage;
//
// power_zero_usage(&sb_power_usage);
//
// dens = (float*) vtr::realloc(dens, sb_mux_sizes[i] * sizeof(float));
// prob = (float*) vtr::realloc(prob, sb_mux_sizes[i] * sizeof(float));
// for (j = 0; j < sb_mux_sizes[i]; j++) {
// if (j == 0) {
// dens[j] = 0;
// prob[j] = 1;
// } else {
// dens[j] = 0;
// prob[j] = 0;
// }
// }
//
// power_usage_mux_multilevel(&sub_power_usage,
// power_get_mux_arch(sb_mux_sizes[i]), prob, dens, 0, true,
// power_callib_period);
// power_add_usage(&sb_power_usage, &sub_power_usage);
//
// power_usage_buffer(&sub_power_usage, sb_buffer_sizes[i], 1, 0, true,
// power_callib_period);
// power_add_usage(&sb_power_usage, &sub_power_usage);
//
// fprintf(power_ctx.output->out, "%d\t%.0f\t%g\n", sb_mux_sizes[i],
// sb_buffer_sizes[i],
// (sb_power_usage.dynamic + sb_power_usage.leakage)
// * power_ctx.solution_inf.T_crit);
//}
//free variables
free(dens);
free(prob);
free(SRAM_bits);
}
static char binary_not(char c) {
if (c == '1') {
return '0';
} else {
return '1';
}
}
float power_usage_buf_for_callibration(int num_inputs, float transistor_size) {
t_power_usage power_usage;
VTR_ASSERT(num_inputs == 1);
power_usage_buffer(&power_usage, transistor_size, 0.5, 2.0, false,
power_callib_period);
return power_sum_usage(&power_usage);
}
float power_usage_buf_levr_for_callibration(int num_inputs,
float transistor_size) {
t_power_usage power_usage;
VTR_ASSERT(num_inputs == 1);
power_usage_buffer(&power_usage, transistor_size, 0.5, 2.0, true,
power_callib_period);
return power_sum_usage(&power_usage);
}
float power_usage_mux_for_callibration(int num_inputs, float transistor_size) {
t_power_usage power_usage;
float* dens;
float* prob;
dens = (float*)vtr::malloc(num_inputs * sizeof(float));
prob = (float*)vtr::malloc(num_inputs * sizeof(float));
for (int i = 0; i < num_inputs; i++) {
dens[i] = 2;
prob[i] = 0.5;
}
power_usage_mux_multilevel(&power_usage,
power_get_mux_arch(num_inputs, transistor_size), prob, dens, 0,
false, power_callib_period);
free(dens);
free(prob);
return power_sum_usage(&power_usage);
}
float power_usage_lut_for_callibration(int num_inputs, float transistor_size) {
t_power_usage power_usage;
char* SRAM_bits;
float* dens;
float* prob;
int lut_size = num_inputs;
/* Initialize an SRAM pattern that guarantees the outputs toggle with
* every input toggle.
*/
SRAM_bits = (char*)vtr::malloc(((1 << lut_size) + 1) * sizeof(char));
for (int i = 1; i <= lut_size; i++) {
if (i == 1) {
SRAM_bits[0] = '1';
SRAM_bits[1] = '0';
} else {
for (int sram_idx = 0; sram_idx < (1 << (i - 1)); sram_idx++) {
SRAM_bits[sram_idx + (1 << (i - 1))] = binary_not(SRAM_bits[sram_idx]);
}
}
SRAM_bits[1 << i] = '\0';
}
dens = (float*)vtr::malloc(lut_size * sizeof(float));
prob = (float*)vtr::malloc(lut_size * sizeof(float));
for (int i = 0; i < lut_size; i++) {
dens[i] = 1;
prob[i] = 0.5;
}
power_usage_lut(&power_usage, lut_size, transistor_size, SRAM_bits, prob,
dens, power_callib_period);
free(SRAM_bits);
free(dens);
free(prob);
return power_sum_usage(&power_usage);
}
float power_usage_ff_for_callibration(int num_inputs, float transistor_size) {
t_power_usage power_usage;
VTR_ASSERT(num_inputs == 1);
power_usage_ff(&power_usage, transistor_size, 0.5, 3, 0.5, 1, 0.5, 2,
power_callib_period);
return power_sum_usage(&power_usage);
}
void power_callibrate() {
/* Buffers and Mux must be done before LUT/FF */
auto& power_ctx = g_vpr_ctx.power();
power_ctx.commonly_used->component_callibration[POWER_CALLIB_COMPONENT_BUFFER]->callibrate();
power_ctx.commonly_used->component_callibration[POWER_CALLIB_COMPONENT_BUFFER_WITH_LEVR]->callibrate();
power_ctx.commonly_used->component_callibration[POWER_CALLIB_COMPONENT_MUX]->callibrate();
power_ctx.commonly_used->component_callibration[POWER_CALLIB_COMPONENT_LUT]->callibrate();
power_ctx.commonly_used->component_callibration[POWER_CALLIB_COMPONENT_FF]->callibrate();
}
void power_print_callibration() {
auto& power_ctx = g_vpr_ctx.power();
power_print_title(power_ctx.output->out, "Callibration Data");
for (int i = 0; i < POWER_CALLIB_COMPONENT_MAX; i++) {
power_ctx.commonly_used->component_callibration[i]->print(power_ctx.output->out);
}
}
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