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Add support for real valued compressed assignment statements in tgt-vvp. 

(cherry picked from commit a0bee0a76f)
This commit is contained in:
Martin Whitaker 2016-02-23 22:02:03 +00:00
parent 33db07ab8d
commit b551a783e8
1 changed files with 176 additions and 15 deletions
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191
tgt-vvp/stmt_assign.c
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2011-2015 Stephen Williams (steve@icarus.com)
* Copyright (c) 2011-2016 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
@ -555,28 +555,130 @@ static int show_stmt_assign_vector(ivl_statement_t net)
return 0;
}
/*
* This function assigns a value to a real variable. This is destined
* for /dev/null when typed ivl_signal_t takes over all the real
* variable support.
*/
static int show_stmt_assign_sig_real(ivl_statement_t net)
enum real_lval_type_e {
REAL_NO_TYPE = 0,
REAL_SIMPLE_WORD,
REAL_MEMORY_WORD_STATIC,
REAL_MEMORY_WORD_DYNAMIC
};
struct real_lval_info {
enum real_lval_type_e type;
union {
struct {
unsigned long use_word;
} simple_word;
struct {
unsigned long use_word;
} memory_word_static;
struct {
/* Index reg that holds the memory word index */
int word_idx_reg;
/* Stored x/non-x flag */
unsigned x_flag;
} memory_word_dynamic;
} u_;
};
static void get_real_from_lval(ivl_lval_t lval, struct real_lval_info*slice)
{
ivl_signal_t sig = ivl_lval_sig(lval);
ivl_expr_t word_ix = ivl_lval_idx(lval);
unsigned long use_word = 0;
/* If the word index is a constant expression, then evaluate
it to select the word, and pay no further heed to the
expression itself. */
if (word_ix && number_is_immediate(word_ix, IMM_WID, 0)) {
assert(! number_is_unknown(word_ix));
use_word = get_number_immediate(word_ix);
word_ix = 0;
}
if (ivl_signal_dimensions(sig)==0 && word_ix==0) {
slice->type = REAL_SIMPLE_WORD;
slice->u_.simple_word.use_word = use_word;
fprintf(vvp_out, " %%load/real v%p_%lu;\n", sig, use_word);
} else if (ivl_signal_dimensions(sig) > 0 && word_ix == 0) {
slice->type = REAL_MEMORY_WORD_STATIC;
slice->u_.memory_word_static.use_word = use_word;
if (use_word < ivl_signal_array_count(sig)) {
fprintf(vvp_out, " %%ix/load 3, %lu, 0;\n",
use_word);
fprintf(vvp_out, " %%load/reala v%p, 3;\n", sig);
} else {
fprintf(vvp_out, " %%pushi/real 0, 0;\n");
}
} else if (ivl_signal_dimensions(sig) > 0 && word_ix != 0) {
slice->type = REAL_MEMORY_WORD_DYNAMIC;
slice->u_.memory_word_dynamic.word_idx_reg = allocate_word();
slice->u_.memory_word_dynamic.x_flag = allocate_flag();
draw_eval_expr_into_integer(word_ix, slice->u_.memory_word_dynamic.word_idx_reg);
fprintf(vvp_out, " %%flag_mov %u, 4;\n", slice->u_.memory_word_dynamic.x_flag);
fprintf(vvp_out, " %%load/reala v%p, %d;\n", sig, slice->u_.memory_word_dynamic.word_idx_reg);
} else {
assert(0);
}
}
static void put_real_to_lval(ivl_lval_t lval, struct real_lval_info*slice)
{
ivl_signal_t sig = ivl_lval_sig(lval);
switch (slice->type) {
default:
fprintf(vvp_out, " ; XXXX slice->type=%d\n", slice->type);
assert(0);
break;
case REAL_SIMPLE_WORD:
fprintf(vvp_out, " %%store/real v%p_%lu;\n",
sig, slice->u_.simple_word.use_word);
break;
case REAL_MEMORY_WORD_STATIC:
if (slice->u_.memory_word_static.use_word < ivl_signal_array_count(sig)) {
int word_idx = allocate_word();
fprintf(vvp_out," %%flag_set/imm 4, 0;\n");
fprintf(vvp_out," %%ix/load %d, %lu, 0;\n", word_idx, slice->u_.memory_word_static.use_word);
fprintf(vvp_out," %%store/reala v%p, %d;\n", sig, word_idx);
clr_word(word_idx);
} else {
fprintf(vvp_out," ; Skip this slice write to v%p [%lu]\n", sig, slice->u_.memory_word_static.use_word);
}
break;
case REAL_MEMORY_WORD_DYNAMIC:
fprintf(vvp_out, " %%flag_mov 4, %u;\n", slice->u_.memory_word_dynamic.x_flag);
fprintf(vvp_out, " %%store/reala v%p, %d;\n", sig, slice->u_.memory_word_dynamic.word_idx_reg);
clr_word(slice->u_.memory_word_dynamic.word_idx_reg);
clr_flag(slice->u_.memory_word_dynamic.x_flag);
break;
}
}
static void store_real_to_lval(ivl_lval_t lval)
{
ivl_lval_t lval;
ivl_signal_t var;
assert(ivl_stmt_opcode(net) == 0);
draw_eval_real(ivl_stmt_rval(net));
assert(ivl_stmt_lvals(net) == 1);
lval = ivl_stmt_lval(net, 0);
var = ivl_lval_sig(lval);
assert(var != 0);
if (ivl_signal_dimensions(var) == 0) {
fprintf(vvp_out, " %%store/real v%p_0;\n", var);
return 0;
return;
}
// For now, only support 1-dimensional arrays.
@ -612,7 +714,66 @@ static int show_stmt_assign_sig_real(ivl_statement_t net)
}
clr_word(word_ix);
}
/*
* This function assigns a value to a real variable. This is destined
* for /dev/null when typed ivl_signal_t takes over all the real
* variable support.
*/
static int show_stmt_assign_sig_real(ivl_statement_t net)
{
struct real_lval_info*slice = 0;
ivl_lval_t lval;
assert(ivl_stmt_lvals(net) == 1);
lval = ivl_stmt_lval(net, 0);
/* If this is a compressed assignment, then get the contents
of the l-value. We need this value as part of the r-value
calculation. */
if (ivl_stmt_opcode(net) != 0) {
fprintf(vvp_out, " ; show_stmt_assign_real: Get l-value for compressed %c= operand\n", ivl_stmt_opcode(net));
slice = calloc(1, sizeof(struct real_lval_info));
get_real_from_lval(lval, slice);
}
draw_eval_real(ivl_stmt_rval(net));
switch (ivl_stmt_opcode(net)) {
case 0:
store_real_to_lval(lval);
if (slice) free(slice);
return 0;
case '+':
fprintf(vvp_out, " %%add/wr;\n");
break;
case '-':
fprintf(vvp_out, " %%sub/wr;\n");
break;
case '*':
fprintf(vvp_out, " %%mul/wr;\n");
break;
case '/':
fprintf(vvp_out, " %%div/wr;\n");
break;
case '%':
fprintf(vvp_out, " %%mod/wr;\n");
break;
default:
fprintf(vvp_out, "; UNSUPPORTED ASSIGNMENT OPCODE: %c\n", ivl_stmt_opcode(net));
assert(0);
break;
}
put_real_to_lval(lval, slice);
free(slice);
return 0;
}