- /**
- * @file irarch.c
- * @date 28.9.2004
- * @author Sebastian Hack
- * @brief Machine dependent firm optimizations.
- *
- * $Id$
- */
-
+/**
+ * @file irarch.c
+ * @date 28.9.2004
+ * @author Sebastian Hack
+ * @brief Machine dependent firm optimizations.
+ *
+ * $Id$
+ */
#include <stdlib.h>
#include <assert.h>
void arch_dep_init(arch_dep_params_factory_t factory)
{
- opts = arch_dep_none;
+ opts = arch_dep_none;
- if(factory != NULL)
- params = factory();
+ if(factory != NULL)
+ params = factory();
}
void arch_dep_set_opts(arch_dep_opts_t the_opts) {
- opts = the_opts;
+ opts = the_opts;
}
ir_node *arch_dep_replace_mul_with_shifts(ir_node *irn)
{
- ir_node *block = get_nodes_block(irn);
- ir_node *res = irn;
- ir_node *operand = NULL;
- ir_node *left, *right;
- ir_mode *mode = get_irn_mode(irn);
- tarval *tv = NULL;
-
- /* If the architecture dependent optimizations were not initialized
- or this optimization was not enabled. */
- if(params == NULL || (opts & arch_dep_mul_to_shift) == 0)
- return irn;
-
- if(is_ir_node(irn)
- && get_irn_opcode(irn) == iro_Mul
- && mode_is_int(mode)) {
-
- left = get_binop_left(irn);
- right = get_binop_right(irn);
-
- /* Look, if one operand is a constant. */
- if(get_irn_opcode(left) == iro_Const) {
- tv = get_Const_tarval(left);
- operand = right;
- } else if(get_irn_opcode(right) == iro_Const) {
- tv = get_Const_tarval(right);
- operand = left;
- }
-
- if(tv != NULL) {
- int maximum_shifts = params->maximum_shifts;
- int also_use_subs = params->also_use_subs;
- int highest_shift_amount = params->highest_shift_amount;
-
- char *bitstr = get_tarval_bitpattern(tv);
- char *p;
- int i, last = 0;
- int counter = 0;
- int curr_bit;
- int compr_len = 0;
- char compr[MAX_BITSTR];
-
- int singleton;
- int end_of_group;
- int shift_with_sub[MAX_BITSTR] = { 0 };
- int shift_without_sub[MAX_BITSTR] = { 0 };
- int shift_with_sub_pos = 0;
- int shift_without_sub_pos = 0;
+ ir_node *res = irn;
+ ir_mode *mode = get_irn_mode(irn);
+
+ /* If the architecture dependent optimizations were not initialized
+ or this optimization was not enabled. */
+ if(params == NULL || (opts & arch_dep_mul_to_shift) == 0)
+ return irn;
+
+ if(get_irn_opcode(irn) == iro_Mul && mode_is_int(mode)) {
+ ir_node *block = get_nodes_block(irn);
+ ir_node *left = get_binop_left(irn);
+ ir_node *right = get_binop_right(irn);
+ tarval *tv = NULL;
+ ir_node *operand = NULL;
+
+ /* Look, if one operand is a constant. */
+ if(get_irn_opcode(left) == iro_Const) {
+ tv = get_Const_tarval(left);
+ operand = right;
+ } else if(get_irn_opcode(right) == iro_Const) {
+ tv = get_Const_tarval(right);
+ operand = left;
+ }
+
+ if(tv != NULL) {
+ int maximum_shifts = params->maximum_shifts;
+ int also_use_subs = params->also_use_subs;
+ int highest_shift_amount = params->highest_shift_amount;
+
+ char *bitstr = get_tarval_bitpattern(tv);
+ char *p;
+ int i, last = 0;
+ int counter = 0;
+ int curr_bit;
+ int compr_len = 0;
+ char compr[MAX_BITSTR];
+
+ int singleton;
+ int end_of_group;
+ int shift_with_sub[MAX_BITSTR] = { 0 };
+ int shift_without_sub[MAX_BITSTR] = { 0 };
+ int shift_with_sub_pos = 0;
+ int shift_without_sub_pos = 0;
#if DEB
- {
- int val = (int) get_tarval_long(tv);
- fprintf(stderr, "Found mul with %d(%x) = ", val, val);
- for(p = bitstr; *p != '\0'; p++)
- printf("%c", *p);
- printf("\n");
- }
+ {
+ long val = get_tarval_long(tv);
+ fprintf(stderr, "Found mul with %ld(%lx) = ", val, val);
+ for(p = bitstr; *p != '\0'; p++)
+ printf("%c", *p);
+ printf("\n");
+ }
#endif
- for(p = bitstr; *p != '\0'; p++) {
- int bit = *p != '0';
-
- switch(bit - last) {
- case -1: // The last was 1 we are now at 0
- case 1: // The last was 0 and we are now at 1
- compr[compr_len++] = counter;
- counter = 1;
- break;
- default:
- counter++;
- }
-
- last = bit;
- }
- compr[compr_len++] = counter;
-
-
-#ifdef DEF
- {
- const char *prefix = "";
- for(i = 0; i < compr_len; i++, prefix = ",")
- fprintf(stderr, "%s%d", prefix, compr[i]);
- fprintf("\n");
- }
+ for(p = bitstr; *p != '\0'; p++) {
+ int bit = *p != '0';
+
+ if (bit != last) {
+ /* The last was 1 we are now at 0 OR
+ * The last was 0 and we are now at 1 */
+ compr[compr_len++] = counter;
+ counter = 1;
+ }
+ else
+ counter++;
+
+ last = bit;
+ }
+ compr[compr_len++] = counter;
+
+
+#ifdef DEB
+ {
+ const char *prefix = "";
+ for(i = 0; i < compr_len; i++, prefix = ",")
+ fprintf(stderr, "%s%d", prefix, compr[i]);
+ fprintf("\n");
+ }
#endif
- // Go over all recorded one groups.
- curr_bit = compr[0];
+ // Go over all recorded one groups.
+ curr_bit = compr[0];
- for(i = 1; i < compr_len; i = end_of_group + 2) {
- int j, zeros_in_group, ones_in_group;
+ for(i = 1; i < compr_len; i = end_of_group + 2) {
+ int j, zeros_in_group, ones_in_group;
- ones_in_group = compr[i];
- zeros_in_group = 0;
+ ones_in_group = compr[i];
+ zeros_in_group = 0;
- // Scan for singular 0s in a sequence
- for(j = i + 1; j < compr_len && compr[j] == 1; j += 2) {
- zeros_in_group += 1;
- ones_in_group += (j + 1 < compr_len ? compr[j + 1] : 0);
- }
- end_of_group = j - 1;
+ // Scan for singular 0s in a sequence
+ for(j = i + 1; j < compr_len && compr[j] == 1; j += 2) {
+ zeros_in_group += 1;
+ ones_in_group += (j + 1 < compr_len ? compr[j + 1] : 0);
+ }
+ end_of_group = j - 1;
- if(zeros_in_group >= ones_in_group - 1)
- end_of_group = i;
+ if(zeros_in_group >= ones_in_group - 1)
+ end_of_group = i;
#ifdef DEB
- fprintf(stderr, " i:%d, eg:%d\n", i, end_of_group);
+ fprintf(stderr, " i:%d, eg:%d\n", i, end_of_group);
#endif
- singleton = compr[i] == 1 && i == end_of_group;
- for(j = i; j <= end_of_group; j += 2) {
- int curr_ones = compr[j];
- int biased_curr_bit = curr_bit + 1;
- int k;
+ singleton = compr[i] == 1 && i == end_of_group;
+ for(j = i; j <= end_of_group; j += 2) {
+ int curr_ones = compr[j];
+ int biased_curr_bit = curr_bit + 1;
+ int k;
#ifdef DEB
- fprintf(stderr, " j:%d, ones:%d\n", j, curr_ones);
+ fprintf(stderr, " j:%d, ones:%d\n", j, curr_ones);
#endif
- // If this ones group is a singleton group (it has no
- // singleton zeros inside
- if(singleton)
- shift_with_sub[shift_with_sub_pos++] = biased_curr_bit;
- else if(j == i)
- shift_with_sub[shift_with_sub_pos++] = -biased_curr_bit;
-
- for(k = 0; k < curr_ones; k++)
- shift_without_sub[shift_without_sub_pos++] = biased_curr_bit + k;
-
- curr_bit += curr_ones;
- biased_curr_bit = curr_bit + 1;
-
- if(!singleton && j == end_of_group)
- shift_with_sub[shift_with_sub_pos++] = biased_curr_bit;
- else if(j != end_of_group)
- shift_with_sub[shift_with_sub_pos++] = -biased_curr_bit;
-
- curr_bit += compr[j + 1];
- }
-
- }
-
- {
- int *shifts = shift_with_sub;
- int n = shift_with_sub_pos;
- int highest_shift_wide = 0;
- int highest_shift_seq = 0;
- int last_shift = 0;
-
- /* If we may not use subs, or we can achive the same with adds,
- prefer adds. */
- if(!also_use_subs || shift_with_sub_pos >= shift_without_sub_pos) {
- shifts = shift_without_sub;
- n = shift_without_sub_pos;
- }
-
- /* If the number of needed shifts exceeds the given maximum,
- use the Mul and exit. */
- if(n > maximum_shifts) {
+ // If this ones group is a singleton group (it has no
+ // singleton zeros inside
+ if(singleton)
+ shift_with_sub[shift_with_sub_pos++] = biased_curr_bit;
+ else if(j == i)
+ shift_with_sub[shift_with_sub_pos++] = -biased_curr_bit;
+
+ for(k = 0; k < curr_ones; k++)
+ shift_without_sub[shift_without_sub_pos++] = biased_curr_bit + k;
+
+ curr_bit += curr_ones;
+ biased_curr_bit = curr_bit + 1;
+
+ if(!singleton && j == end_of_group)
+ shift_with_sub[shift_with_sub_pos++] = biased_curr_bit;
+ else if(j != end_of_group)
+ shift_with_sub[shift_with_sub_pos++] = -biased_curr_bit;
+
+ curr_bit += compr[j + 1];
+ }
+
+ }
+
+ {
+ int *shifts = shift_with_sub;
+ int n = shift_with_sub_pos;
+ int highest_shift_wide = 0;
+ int highest_shift_seq = 0;
+ int last_shift = 0;
+
+ /* If we may not use subs, or we can achive the same with adds,
+ prefer adds. */
+ if(!also_use_subs || shift_with_sub_pos >= shift_without_sub_pos) {
+ shifts = shift_without_sub;
+ n = shift_without_sub_pos;
+ }
+
+ /* If the number of needed shifts exceeds the given maximum,
+ use the Mul and exit. */
+ if(n > maximum_shifts) {
#ifdef DEB
- fprintf(stderr, "Only allowed %d shifts, but %d are needed\n",
- maximum_shifts, n);
+ fprintf(stderr, "Only allowed %d shifts, but %d are needed\n",
+ maximum_shifts, n);
#endif
- return irn;
- }
-
- /* Compute the highest shift needed for both, the
- sequential and wide representations. */
- for(i = 0; i < n; i++) {
- int curr = abs(shifts[i]);
- int curr_seq = curr - last;
-
- highest_shift_wide = curr > highest_shift_wide ? curr
- : highest_shift_wide;
- highest_shift_seq = curr_seq > highest_shift_seq ? curr_seq
- : highest_shift_seq;
-
- last_shift = curr;
- }
-
- /* If the highest shift amount is greater than the given limit,
- give back the Mul */
- if(highest_shift_seq > highest_shift_amount) {
+ return irn;
+ }
+
+ /* Compute the highest shift needed for both, the
+ sequential and wide representations. */
+ for(i = 0; i < n; i++) {
+ int curr = abs(shifts[i]);
+ int curr_seq = curr - last;
+
+ highest_shift_wide = curr > highest_shift_wide ? curr
+ : highest_shift_wide;
+ highest_shift_seq = curr_seq > highest_shift_seq ? curr_seq
+ : highest_shift_seq;
+
+ last_shift = curr;
+ }
+
+ /* If the highest shift amount is greater than the given limit,
+ give back the Mul */
+ if(highest_shift_seq > highest_shift_amount) {
#ifdef DEB
- fprintf(stderr, "Shift argument %d exceeds maximum %d\n",
- highest_shift_seq, highest_shift_amount);
+ fprintf(stderr, "Shift argument %d exceeds maximum %d\n",
+ highest_shift_seq, highest_shift_amount);
#endif
- return irn;
- }
+ return irn;
+ }
- /* If we have subs, we cannot do sequential. */
- if(1 /* also_use_subs */) {
- if(n > 0) {
- ir_node *curr = NULL;
+ /* If we have subs, we cannot do sequential. */
+ if(1 /* also_use_subs */) {
+ if(n > 0) {
+ ir_node *curr = NULL;
- i = n - 1;
+ i = n - 1;
- do {
- int curr_shift = shifts[i];
- int sub = curr_shift < 0;
- int amount = abs(curr_shift) - 1;
- ir_node *aux = operand;
+ do {
+ int curr_shift = shifts[i];
+ int sub = curr_shift < 0;
+ int amount = abs(curr_shift) - 1;
+ ir_node *aux = operand;
- assert(amount >= 0 && "What is a negative shift??");
+ assert(amount >= 0 && "What is a negative shift??");
- if(amount != 0) {
- tarval *shift_amount = new_tarval_from_long(amount, mode_Iu);
- ir_node *cnst = new_r_Const(current_ir_graph, block, mode_Iu, shift_amount);
- aux = new_r_Shl(current_ir_graph, block, operand, cnst, mode);
- }
+ if(amount != 0) {
+ tarval *shift_amount = new_tarval_from_long(amount, mode_Iu);
+ ir_node *cnst = new_r_Const(current_ir_graph, block, mode_Iu, shift_amount);
+ aux = new_r_Shl(current_ir_graph, block, operand, cnst, mode);
+ }
- if(curr) {
- if(sub)
- curr = new_r_Sub(current_ir_graph, block, curr, aux, mode);
- else
- curr = new_r_Add(current_ir_graph, block, curr, aux, mode);
- } else
- curr = aux;
+ if(curr) {
+ if(sub)
+ curr = new_r_Sub(current_ir_graph, block, curr, aux, mode);
+ else
+ curr = new_r_Add(current_ir_graph, block, curr, aux, mode);
+ } else
+ curr = aux;
- } while(--i >= 0);
+ } while(--i >= 0);
- res = curr;
- }
- }
+ res = curr;
+ }
+ }
#ifdef DEB
- {
- const char *prefix = "";
- for(i = 0; i < n; i++) {
- fprintf(stderr, "%s%d", prefix, shifts[i]);
- prefix = ", ";
- }
- fprintf(stderr, "\n");
- }
+ {
+ const char *prefix = "";
+ for(i = 0; i < n; i++) {
+ fprintf(stderr, "%s%d", prefix, shifts[i]);
+ prefix = ", ";
+ }
+ fprintf(stderr, "\n");
+ }
#endif
- }
+ }
- if(bitstr)
- free(bitstr);
- }
+ if(bitstr)
+ free(bitstr);
+ }
- }
+ }
- if (res != irn)
- stat_arch_dep_replace_mul_with_shifts(irn);
+ if (res != irn)
+ stat_arch_dep_replace_mul_with_shifts(irn);
+
+ return res;
+}
- return res;
+ir_node *arch_dep_replace_div_with_shifts(ir_node *irn)
+{
+ ir_node *res = irn;
+
+ /* If the architecture dependent optimizations were not initialized
+ or this optimization was not enabled. */
+ if (params == NULL || (opts & arch_dep_div_to_shift) == 0)
+ return irn;
+
+ if (get_irn_opcode(irn) == iro_Div) {
+ ir_node *c = get_Div_right(irn);
+ ir_node *block, *left;
+ ir_mode *mode;
+ tarval *tv;
+ dbg_info *dbg;
+ int n, bits;
+ int i, k, num;
+
+ if (get_irn_op(c) != op_Const)
+ return irn;
+
+ left = get_Div_left(irn);
+ mode = get_irn_mode(left);
+ block = get_nodes_block(irn);
+ dbg = get_irn_dbg_info(irn);
+ tv = get_Const_tarval(c);
+
+ bits = get_mode_size_bits(mode);
+ n = (bits + 7) / 8;
+
+ for (num = i = 0; i < n; ++i) {
+ unsigned char v = get_tarval_sub_bits(tv, i);
+
+ if (v) {
+ int j;
+
+ for (j = 0; j < 8; ++j)
+ if ((1 << j) & v) {
+ ++num;
+ k = 8 * i + j;
+ }
+ }
+ }
+
+ if (num == 1) { /* division by 2^k */
+
+ if (mode_is_signed(mode)) {
+ ir_node *k_node;
+ ir_node *curr = left;
+
+ if (k != 1) {
+ k_node = new_r_Const(current_ir_graph, block, mode_Iu, new_tarval_from_long(k - 1, mode_Iu));
+ curr = new_rd_Shrs(dbg, current_ir_graph, block, left, k_node, mode);
+ }
+
+ k_node = new_r_Const(current_ir_graph, block, mode_Iu, new_tarval_from_long(bits - k, mode_Iu));
+ curr = new_rd_Shr(dbg, current_ir_graph, block, curr, k_node, mode);
+
+ curr = new_rd_Add(dbg, current_ir_graph, block, left, curr, mode);
+
+ k_node = new_r_Const(current_ir_graph, block, mode_Iu, new_tarval_from_long(k, mode_Iu));
+ res = new_rd_Shrs(dbg, current_ir_graph, block, curr, k_node, mode);
+ }
+ else { /* unsigned case */
+ ir_node *k_node;
+
+ k_node = new_r_Const(current_ir_graph, block, mode_Iu, new_tarval_from_long(k, mode_Iu));
+ res = new_rd_Shl(dbg, current_ir_graph, block, left, k_node, mode);
+ }
+ }
+ }
+
+ if (res != irn)
+ stat_arch_dep_replace_div_with_shifts(irn);
+
+ return res;
+}
+
+ir_node *arch_dep_replace_mod_with_shifts(ir_node *irn)
+{
+ ir_node *res = irn;
+
+ /* If the architecture dependent optimizations were not initialized
+ or this optimization was not enabled. */
+ if (params == NULL || (opts & arch_dep_mod_to_shift) == 0)
+ return irn;
+
+ if (get_irn_opcode(irn) == iro_Mod) {
+ ir_node *c = get_Mod_right(irn);
+ ir_node *block, *left;
+ ir_mode *mode;
+ tarval *tv;
+ dbg_info *dbg;
+ int n, bits;
+ int i, k, num;
+
+ if (get_irn_op(c) != op_Const)
+ return irn;
+
+ left = get_Mod_left(irn);
+ mode = get_irn_mode(left);
+ block = get_nodes_block(irn);
+ dbg = get_irn_dbg_info(irn);
+ tv = get_Const_tarval(c);
+
+ bits = get_mode_size_bits(mode);
+ n = (bits + 7) / 8;
+
+ for (num = i = 0; i < n; ++i) {
+ unsigned char v = get_tarval_sub_bits(tv, i);
+
+ if (v) {
+ int j;
+
+ for (j = 0; j < 8; ++j)
+ if ((1 << j) & v) {
+ ++num;
+ k = 8 * i + j;
+ }
+ }
+ }
+
+ if (num == 1) { /* remainder by 2^k */
+
+ if (mode_is_signed(mode)) {
+ ir_node *k_node;
+ ir_node *curr = left;
+
+ if (k != 1) {
+ k_node = new_r_Const(current_ir_graph, block, mode_Iu, new_tarval_from_long(k - 1, mode_Iu));
+ curr = new_rd_Shrs(dbg, current_ir_graph, block, left, k_node, mode);
+ }
+
+ k_node = new_r_Const(current_ir_graph, block, mode_Iu, new_tarval_from_long(bits - k, mode_Iu));
+ curr = new_rd_Shr(dbg, current_ir_graph, block, curr, k_node, mode);
+
+ curr = new_rd_Add(dbg, current_ir_graph, block, left, curr, mode);
+
+ k_node = new_r_Const(current_ir_graph, block, mode, new_tarval_from_long((-1) << k, mode));
+ curr = new_rd_And(dbg, current_ir_graph, block, curr, k_node, mode);
+
+ res = new_rd_Sub(dbg, current_ir_graph, block, left, curr, mode);
+ }
+ else { /* unsigned case */
+ ir_node *k_node;
+
+ k_node = new_r_Const(current_ir_graph, block, mode, new_tarval_from_long((1 << k) - 1, mode));
+ res = new_rd_And(dbg, current_ir_graph, block, left, k_node, mode);
+ }
+ }
+ }
+
+ if (res != irn)
+ stat_arch_dep_replace_mod_with_shifts(irn);
+
+ return res;
+}
+
+void arch_dep_replace_divmod_with_shifts(ir_node **div, ir_node **mod, ir_node *irn)
+{
+ *div = *mod = NULL;
+
+ /* If the architecture dependent optimizations were not initialized
+ or this optimization was not enabled. */
+ if (params == NULL ||
+ (opts & (arch_dep_div_to_shift|arch_dep_mod_to_shift) != (arch_dep_div_to_shift|arch_dep_mod_to_shift)))
+ return;
+
+ if (get_irn_opcode(irn) == iro_DivMod) {
+ ir_node *c = get_DivMod_right(irn);
+ ir_node *block, *left;
+ ir_mode *mode;
+ tarval *tv;
+ dbg_info *dbg;
+ int n, bits;
+ int i, k, num;
+
+ if (get_irn_op(c) != op_Const)
+ return;
+
+ left = get_DivMod_left(irn);
+ mode = get_irn_mode(left);
+ block = get_nodes_block(irn);
+ dbg = get_irn_dbg_info(irn);
+ tv = get_Const_tarval(c);
+
+ bits = get_mode_size_bits(mode);
+ n = (bits + 7) / 8;
+
+ for (num = i = 0; i < n; ++i) {
+ unsigned char v = get_tarval_sub_bits(tv, i);
+
+ if (v) {
+ int j;
+
+ for (j = 0; j < 8; ++j)
+ if ((1 << j) & v) {
+ ++num;
+ k = 8 * i + j;
+ }
+ }
+ }
+
+ if (num == 1) { /* division & remainder by 2^k */
+
+ if (mode_is_signed(mode)) {
+ ir_node *k_node;
+ ir_node *curr = left;
+
+ if (k != 1) {
+ k_node = new_r_Const(current_ir_graph, block, mode_Iu, new_tarval_from_long(k - 1, mode_Iu));
+ curr = new_rd_Shrs(dbg, current_ir_graph, block, left, k_node, mode);
+ }
+
+ k_node = new_r_Const(current_ir_graph, block, mode_Iu, new_tarval_from_long(bits - k, mode_Iu));
+ curr = new_rd_Shr(dbg, current_ir_graph, block, curr, k_node, mode);
+
+ curr = new_rd_Add(dbg, current_ir_graph, block, left, curr, mode);
+
+ k_node = new_r_Const(current_ir_graph, block, mode_Iu, new_tarval_from_long(k, mode_Iu));
+ *div = new_rd_Shrs(dbg, current_ir_graph, block, curr, k_node, mode);
+
+ k_node = new_r_Const(current_ir_graph, block, mode, new_tarval_from_long((-1) << k, mode));
+ curr = new_rd_And(dbg, current_ir_graph, block, curr, k_node, mode);
+
+ *mod = new_rd_Sub(dbg, current_ir_graph, block, left, curr, mode);
+ }
+ else { /* unsigned case */
+ ir_node *k_node;
+
+ k_node = new_r_Const(current_ir_graph, block, mode_Iu, new_tarval_from_long(k, mode_Iu));
+ *div = new_rd_Shl(dbg, current_ir_graph, block, left, k_node, mode);
+
+ k_node = new_r_Const(current_ir_graph, block, mode, new_tarval_from_long((1 << k) - 1, mode));
+ *mod = new_rd_And(dbg, current_ir_graph, block, left, k_node, mode);
+ }
+ }
+ }
+
+ if (*div)
+ stat_arch_dep_replace_DivMod_with_shifts(irn);
}
static const arch_dep_params_t default_params = {
- 1, /* also use subs */
- 4, /* maximum shifts */
- 31 /* maximum shift amount */
+ 1, /* also use subs */
+ 4, /* maximum shifts */
+ 31 /* maximum shift amount */
};
const arch_dep_params_t *arch_dep_default_factory(void) {
- return &default_params;
+ return &default_params;
}
projects / libfirm / blobdiff