Massive rewrite of how emitters and the instruction selector works, after I
realised that the existing approach wasn't working. Now, hopefully, tracks the instruction trees generated during selection properly.
This commit is contained in:
David Given
parent
68f98cbad7
commit
bd28bddb92
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@ -20,6 +20,7 @@ struct ir
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ARRAYOF(struct ir) phivalue;
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} u;
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struct vreg* result; /* vreg containing IR result */
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IMAPOF(struct hop) hops; /* only for root IRs; by goal */
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};
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@ -1,10 +1,22 @@
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#include "mcg.h"
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#define MAX_CHILDREN 10
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struct insn
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{
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struct ir* ir;
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struct hop* hop;
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const struct burm_instruction_data* insndata;
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int num_children;
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struct insn* children[MAX_CHILDREN];
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};
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static struct basicblock* current_bb;
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static struct hop* current_hop;
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static struct ir* current_ir;
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static struct insn* current_insn;
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static const struct burm_emitter_data emitter_data;
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static void emit(struct insn* insn);
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void burm_trace(struct burm_node* p, int ruleno, int cost, int bestcost) {
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const struct burm_instruction_data* insndata = &burm_instruction_data[ruleno];
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@ -20,11 +32,23 @@ void burm_panic_cannot_match(struct burm_node* node)
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exit(1);
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}
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static void emit_reg(struct burm_node* node, int goal)
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static void emit_return_reg(void)
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{
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struct hop* hop = imap_get(¤t_ir->hops, goal);
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hop_add_vreg_insel(current_hop, current_hop->output);
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}
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hop_add_vreg_insel(current_hop, hop->output);
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static void emit_reg(int child)
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{
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struct insn* insn = current_insn->children[child];
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struct vreg* vreg;
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if (insn->hop)
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vreg = insn->hop->output;
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else
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vreg = insn->ir->result;
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if (vreg)
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hop_add_vreg_insel(current_hop, vreg);
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}
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static void emit_string(const char* data)
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@ -32,17 +56,14 @@ static void emit_string(const char* data)
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hop_add_string_insel(current_hop, data);
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}
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static void emit_fragment(struct burm_node* node, int goal)
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static void emit_fragment(int child)
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{
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int insn_no = burm_rule(node->state_label, goal);
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const struct burm_instruction_data* insndata = &burm_instruction_data[insn_no];
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if (insndata->emitter)
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insndata->emitter(node, &emitter_data);
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emit(current_insn->children[child]);
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}
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static void emit_value(struct burm_node* node)
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static void emit_value(int child)
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{
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hop_add_value_insel(current_hop, node->ir);
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hop_add_value_insel(current_hop, current_insn->children[child]->ir);
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}
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static void emit_eoi(void)
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@ -50,73 +71,75 @@ static void emit_eoi(void)
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hop_add_eoi_insel(current_hop);
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}
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static void emit_constraint_equals(struct burm_node* node, int goal)
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{
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#if 0
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struct hop* hop;
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if (!goal)
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goal = ir->goal_no;
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hop = imap_get(¤t_ir->hops, goal);
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current_hop->output = hop->output;
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#endif
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}
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static const struct burm_emitter_data emitter_data =
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{
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&emit_string,
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&emit_fragment,
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&emit_return_reg,
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&emit_reg,
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&emit_value,
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&emit_eoi,
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&emit_constraint_equals
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};
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static void walk_instructions(struct burm_node* node, int goal)
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static void emit(struct insn* insn)
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{
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struct burm_node* children[10];
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int insn_no = burm_rule(node->state_label, goal);
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const struct burm_instruction_data* insndata = &burm_instruction_data[insn_no];
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const short* nts = burm_nts[insn_no];
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struct hop* parent_hop = NULL;
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struct ir* ir = node->ir;
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struct insn* old = current_insn;
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current_insn = insn;
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insn->insndata->emitter(&emitter_data);
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current_insn = old;
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}
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static struct insn* walk_instructions(struct burm_node* node, int goal)
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{
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struct insn* insn = calloc(1, sizeof(*insn));
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int i;
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if (!insndata->is_fragment)
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insn->ir = node->ir;
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insn->num_children = 0;
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if (goal)
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{
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parent_hop = current_hop;
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current_hop = new_hop(insn_no, ir);
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if (goal != 1)
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{
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current_hop->output = new_vreg();
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imap_add(¤t_ir->hops, goal, current_hop);
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}
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}
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int insn_no = burm_rule(node->state_label, goal);
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const short* nts = burm_nts[insn_no];
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struct burm_node* children[MAX_CHILDREN] = {0};
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insn->insndata = &burm_instruction_data[insn_no];
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burm_kids(node, insn_no, children);
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for (i=0; nts[i]; i++)
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walk_instructions(children[i], nts[i]);
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tracef('I', "I: $%d goal %d selected %s %d: %s\n",
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ir->id,
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goal,
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insndata->is_fragment ? "fragment" : "instruction",
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insn_no,
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insndata->name);
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if (!insndata->is_fragment)
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i = 0;
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for (;;)
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{
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/* This may cause the vregs to be reassigned for this instruction (and
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* fragments contained within it). */
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if (!children[i])
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break;
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insndata->emitter(node, &emitter_data);
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hop_print('I', current_hop);
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array_append(&ir->hops, current_hop);
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current_hop = parent_hop;
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insn->children[i] = walk_instructions(children[i], nts[i]);
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insn->num_children++;
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i++;
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}
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tracef('I', "I: $%d goal %d %s selected %d: %s\n",
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node->ir->id,
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goal,
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insn->insndata->is_fragment ? "fragment" : "instruction",
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insn_no,
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insn->insndata->name);
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if (!insn->insndata->is_fragment)
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{
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insn->hop = current_hop = new_hop(0, insn->ir);
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insn->hop->output = new_vreg();
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emit(insn);
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hop_print('I', current_hop);
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if (goal != 1)
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insn->ir->result = insn->hop->output;
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}
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}
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return insn;
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}
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static struct burm_node* build_shadow_tree(struct ir* root, struct ir* ir)
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@ -52,6 +52,7 @@ PATTERNS
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cost 4;
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reg = POP4
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with int reg
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emit "pop %reg"
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cost 4;
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@ -68,12 +69,11 @@ PATTERNS
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cost 4;
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reg = in:REG
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with (reg == in)
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emit "reg %reg"
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emit "mov %reg, %in"
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cost 1;
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reg = NOP(in:reg)
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with (reg == in)
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emit "mov %reg, %in"
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cost 1;
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@ -90,18 +90,22 @@ PATTERNS
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cost 4;
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reg = LOAD4(addr:address)
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with int reg
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emit "ldr %reg, %addr"
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cost 4;
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reg = LOAD1(addr:address)
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with int reg
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emit "ldrb %reg, %addr"
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cost 4;
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reg = CIU14(LOAD1(addr:address))
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with int reg
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emit "ldrb %reg, %addr"
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cost 4;
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reg = CII14(CIU41(CIU14(LOAD1(addr:address))))
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with int reg
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emit "ldrsb %reg, %addr"
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cost 4;
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@ -109,6 +113,7 @@ PATTERNS
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/* Locals */
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reg = in:LOCAL4
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with int reg
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emit "add %reg, fp, #$in"
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cost 4;
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@ -161,14 +166,17 @@ PATTERNS
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/* Comparisons */
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cc = COMPARES4(left:reg, right:aluparam)
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with cc cc
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emit "cmp %left, %right"
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cost 4;
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cc = COMPARES4(COMPARES4(left:reg, right:aluparam), CONST4)
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with cc cc
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emit "cmp %left, %right"
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cost 4;
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reg = cc
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with int reg
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emit "mov %reg, #0"
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emit "movlt %reg, #-1"
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emit "movgt %reg, #1"
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@ -178,10 +186,12 @@ PATTERNS
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/* Conversions */
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reg = CII14(CIU41(value:reg))
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with int reg
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emit "sxtb %reg, %value"
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cost 4;
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reg = CIU41(in:reg)
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with int reg
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emit "and %reg, %in, #0xff"
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cost 4;
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@ -189,19 +199,23 @@ PATTERNS
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/* ALU operations */
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reg = ADD4(left:reg, right:aluparam)
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with int reg
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emit "add %reg, %left, %right"
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cost 4;
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reg = ADD4(left:aluparam, right:reg)
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with int reg
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emit "add %reg, %right, %left"
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cost 4;
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reg = MOD4(left:reg, right:reg)
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with int reg
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emit "udiv %reg, %left, %right"
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emit "mls %reg, %reg, %right, %left"
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cost 8;
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reg = DIV4(left:reg, right:aluparam)
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with int reg
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emit "div %reg, %left, %right"
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cost 4;
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@ -212,28 +226,34 @@ PATTERNS
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emit "%value";
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reg = value:aluparam
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with int reg
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emit "mov %reg, %value"
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cost 4;
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reg = value:LABEL4
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with int reg
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emit "adr %reg, $value"
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cost 4;
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reg = value:BLOCK4
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with int reg
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emit "adr %reg, $value"
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cost 4;
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reg = value:CONST4
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with int reg
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emit "ldr %reg, address-containing-$value"
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cost 8;
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reg = value:CONSTF4
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with int reg
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emit "vldr %reg, address-containing-$value"
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cost 8;
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/* FPU operations */
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reg = ADDF4(left:reg, right:reg)
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with int reg
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emit "fadds %reg, %left, %right"
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cost 4;
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@ -28,6 +28,7 @@ static int nextern = 1;
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}
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%term ALLOCATES
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%term COPY
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%term COST
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%term DECLARATIONS
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%term EMIT
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@ -679,20 +679,22 @@ static void emitheader(void)
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}
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/* computekids - compute paths to kids in tree t */
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static char* computekids(Tree t, const char* v, char* bp, int* ip)
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static char* computekids(Tree node, const char* v, char* bp, int* ip)
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{
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Term p = t->op;
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Term t = node->op;
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if (p->kind == NONTERM)
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if (!node->left && !node->right)
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{
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sprintf(bp, "\t\tkids[%d] = %s;\n", (*ip)++, v);
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bp += strlen(bp);
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}
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else if (p->arity > 0)
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if (t->kind == TERM)
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{
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bp = computekids(t->left, aprintf("LEFT_CHILD(%s)", v), bp, ip);
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if (p->arity == 2)
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bp = computekids(t->right, aprintf("RIGHT_CHILD(%s)", v), bp, ip);
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if (t->arity >= 1)
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bp = computekids(node->left, aprintf("LEFT_CHILD(%s)", v), bp, ip);
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if (t->arity == 2)
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bp = computekids(node->right, aprintf("RIGHT_CHILD(%s)", v), bp, ip);
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}
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return bp;
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}
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@ -910,6 +912,27 @@ static void label_not_found(Rule rule, const char* label)
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exit(1);
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}
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static bool find_child_index(Tree node, const char* name, int* index, Tree* found)
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{
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/* This must return the same ordering as the burm_kids() function uses. */
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if (node->label && strcmp(node->label, name) == 0)
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{
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if (found)
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*found = node;
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return true;
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}
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if (!node->left && !node->right)
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(*index)++;
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if (node->left && find_child_index(node->left, name, index, found))
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return true;
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if (node->right && find_child_index(node->right, name, index, found))
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return true;
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return false;
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}
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/* emitpredicates - emit predicates for rules */
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static void emitpredicatedefinitions(Rule r)
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{
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@ -954,49 +977,6 @@ static void emitpredicatedefinitions(Rule r)
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}
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}
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static void invalid_equals_constraint(Rule rule)
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{
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yylineno = rule->lineno;
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yyerror("left hand side of an equality constraint must be the output register");
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exit(1);
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}
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static void emit_ir_expr(Rule rule, const char* label)
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{
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if (strcmp(label, rule->lhs->name) == 0)
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print("node, %P%s_NT", label);
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else
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{
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Tree node;
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uint32_t path = find_label(rule->pattern, label, 0, &node);
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Nonterm nt = node->op;
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if (path == PATH_MISSING)
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label_not_found(rule, label);
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print_path(path);
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if (nt->kind == NONTERM)
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print(", %P%s_NT", ((Nonterm)node->op)->name);
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else
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print(", 0");
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}
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}
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static void emit_constraint(Rule rule, struct constraint* c)
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{
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switch (c->type)
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{
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case CONSTRAINT_EQUALS:
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if (strcmp(c->left, rule->lhs->name) != 0)
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invalid_equals_constraint(rule);
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print("%1data->emit_constraint_equals(");
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emit_ir_expr(rule, c->right);
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print(");\n");
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break;
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}
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}
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/* emitinsndata - emit the code generation data */
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static void emitinsndata(Rule rules)
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{
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@ -1007,6 +987,7 @@ static void emitinsndata(Rule rules)
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while (r)
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{
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struct stringfragment* f = r->code.first;
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yylineno = r->lineno;
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if (!f)
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{
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@ -1019,20 +1000,7 @@ static void emitinsndata(Rule rules)
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}
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print("/* %R */\n", r);
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print("static void %Pemitter_%d(NODEPTR_TYPE node, const struct %Pemitter_data* data) {\n", r->ern);
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/* Constraints come first, because they may cause vreg reassignment, which
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* we want to happen before the instruction emission. */
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{
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int i;
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for (i=0; i<r->constraints.count; i++)
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{
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struct constraint* c = r->constraints.item[i];
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emit_constraint(r, c);
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}
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}
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print("static void %Pemitter_%d(const struct %Pemitter_data* data) {\n", r->ern);
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while (f)
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{
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@ -1043,23 +1011,26 @@ static void emitinsndata(Rule rules)
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const char* label = f->data + 1;
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if (strcmp(label, r->lhs->name) == 0)
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print("%1data->emit_reg(node, %P%s_NT);\n", label);
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print("%1data->emit_return_reg();\n", label);
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else
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{
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||||
Tree node;
|
||||
uint32_t path = find_label(r->pattern, label, 0, &node);
|
||||
int index = 0;
|
||||
if (!find_child_index(r->pattern, label, &index, &node))
|
||||
label_not_found(r, label);
|
||||
Nonterm nt = node->op;
|
||||
|
||||
if (path == PATH_MISSING)
|
||||
label_not_found(r, label);
|
||||
|
||||
if (nt->kind == NONTERM)
|
||||
{
|
||||
if (nt->is_fragment)
|
||||
print("%1data->emit_fragment(");
|
||||
else
|
||||
print("%1data->emit_reg(");
|
||||
}
|
||||
else
|
||||
print("%1data->emit_reg(");
|
||||
|
||||
print_path(path);
|
||||
print(", %P%s_NT);\n", ((Nonterm)node->op)->name);
|
||||
print("%d);\n", index);
|
||||
}
|
||||
break;
|
||||
}
|
||||
|
|
@ -1067,12 +1038,11 @@ static void emitinsndata(Rule rules)
|
|||
case '$':
|
||||
{
|
||||
const char* label = f->data + 1;
|
||||
uint32_t path = find_label(r->pattern, label, 0, NULL);
|
||||
print("%1data->emit_value(");
|
||||
if (path == PATH_MISSING)
|
||||
int index = 0;
|
||||
if (!find_child_index(r->pattern, label, &index, NULL))
|
||||
label_not_found(r, label);
|
||||
print_path(path);
|
||||
print(");\n");
|
||||
|
||||
print("%1data->emit_value(%d);\n", index);
|
||||
break;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -39,14 +39,14 @@ extern void burm_trace(NODEPTR_TYPE p, int ruleno, int cost, int bestcost);
|
|||
struct burm_emitter_data
|
||||
{
|
||||
void (*emit_string)(const char* data);
|
||||
void (*emit_fragment)(NODEPTR_TYPE node, int goal);
|
||||
void (*emit_reg)(NODEPTR_TYPE node, int goal);
|
||||
void (*emit_value)(NODEPTR_TYPE node);
|
||||
void (*emit_fragment)(int child);
|
||||
void (*emit_return_reg)(void);
|
||||
void (*emit_reg)(int child);
|
||||
void (*emit_value)(int child);
|
||||
void (*emit_eoi)(void);
|
||||
void (*emit_constraint_equals)(NODEPTR_TYPE node, int goal);
|
||||
};
|
||||
|
||||
typedef void burm_emitter_t(NODEPTR_TYPE node, const struct burm_emitter_data* data);
|
||||
typedef void burm_emitter_t(const struct burm_emitter_data* data);
|
||||
|
||||
struct burm_instruction_data
|
||||
{
|
||||
|
|
|
|||
Loading…
Reference in a new issue