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-rw-r--r--frontends/ast/ast.cc6
-rw-r--r--frontends/ast/ast.h3
-rw-r--r--frontends/ast/genrtlil.cc32
-rw-r--r--frontends/ast/simplify.cc85
4 files changed, 106 insertions, 20 deletions
diff --git a/frontends/ast/ast.cc b/frontends/ast/ast.cc
index 6a9af3f57..689fa9fb4 100644
--- a/frontends/ast/ast.cc
+++ b/frontends/ast/ast.cc
@@ -94,6 +94,7 @@ std::string AST::type2str(AstNodeType type)
X(AST_TO_BITS)
X(AST_TO_SIGNED)
X(AST_TO_UNSIGNED)
+ X(AST_SELFSZ)
X(AST_CONCAT)
X(AST_REPLICATE)
X(AST_BIT_NOT)
@@ -110,6 +111,8 @@ std::string AST::type2str(AstNodeType type)
X(AST_SHIFT_RIGHT)
X(AST_SHIFT_SLEFT)
X(AST_SHIFT_SRIGHT)
+ X(AST_SHIFTX)
+ X(AST_SHIFT)
X(AST_LT)
X(AST_LE)
X(AST_EQ)
@@ -615,6 +618,7 @@ void AstNode::dumpVlog(FILE *f, std::string indent) const
if (0) { case AST_POS: txt = "+"; }
if (0) { case AST_NEG: txt = "-"; }
if (0) { case AST_LOGIC_NOT: txt = "!"; }
+ if (0) { case AST_SELFSZ: txt = "@selfsz@"; }
fprintf(f, "%s(", txt.c_str());
children[0]->dumpVlog(f, "");
fprintf(f, ")");
@@ -628,6 +632,8 @@ void AstNode::dumpVlog(FILE *f, std::string indent) const
if (0) { case AST_SHIFT_RIGHT: txt = ">>"; }
if (0) { case AST_SHIFT_SLEFT: txt = "<<<"; }
if (0) { case AST_SHIFT_SRIGHT: txt = ">>>"; }
+ if (0) { case AST_SHIFTX: txt = "@shiftx@"; }
+ if (0) { case AST_SHIFT: txt = "@shift@"; }
if (0) { case AST_LT: txt = "<"; }
if (0) { case AST_LE: txt = "<="; }
if (0) { case AST_EQ: txt = "=="; }
diff --git a/frontends/ast/ast.h b/frontends/ast/ast.h
index 3f6329112..8932108e3 100644
--- a/frontends/ast/ast.h
+++ b/frontends/ast/ast.h
@@ -75,6 +75,7 @@ namespace AST
AST_TO_BITS,
AST_TO_SIGNED,
AST_TO_UNSIGNED,
+ AST_SELFSZ,
AST_CONCAT,
AST_REPLICATE,
AST_BIT_NOT,
@@ -91,6 +92,8 @@ namespace AST
AST_SHIFT_RIGHT,
AST_SHIFT_SLEFT,
AST_SHIFT_SRIGHT,
+ AST_SHIFTX,
+ AST_SHIFT,
AST_LT,
AST_LE,
AST_EQ,
diff --git a/frontends/ast/genrtlil.cc b/frontends/ast/genrtlil.cc
index 996762715..cdc3adc9c 100644
--- a/frontends/ast/genrtlil.cc
+++ b/frontends/ast/genrtlil.cc
@@ -809,6 +809,11 @@ void AstNode::detectSignWidthWorker(int &width_hint, bool &sign_hint, bool *foun
sign_hint = false;
break;
+ case AST_SELFSZ:
+ sub_width_hint = 0;
+ children.at(0)->detectSignWidthWorker(sub_width_hint, sign_hint);
+ break;
+
case AST_CONCAT:
for (auto child : children) {
sub_width_hint = 0;
@@ -856,6 +861,8 @@ void AstNode::detectSignWidthWorker(int &width_hint, bool &sign_hint, bool *foun
case AST_SHIFT_RIGHT:
case AST_SHIFT_SLEFT:
case AST_SHIFT_SRIGHT:
+ case AST_SHIFTX:
+ case AST_SHIFT:
case AST_POW:
children[0]->detectSignWidthWorker(width_hint, sign_hint, found_real);
break;
@@ -923,7 +930,7 @@ void AstNode::detectSignWidthWorker(int &width_hint, bool &sign_hint, bool *foun
}
break;
}
- /* fall through */
+ YS_FALLTHROUGH
// everything should have been handled above -> print error if not.
default:
@@ -1019,7 +1026,7 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
if (GetSize(children) >= 1 && children[0]->type == AST_CONSTANT) {
current_module->parameter_default_values[str] = children[0]->asParaConst();
}
- /* fall through */
+ YS_FALLTHROUGH
case AST_LOCALPARAM:
if (flag_pwires)
{
@@ -1048,7 +1055,7 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
if (!range_valid)
log_file_error(filename, location.first_line, "Signal `%s' with non-constant width!\n", str.c_str());
- if (!(range_left >= range_right || (range_left == -1 && range_right == 0)))
+ if (!(range_left + 1 >= range_right))
log_file_error(filename, location.first_line, "Signal `%s' with invalid width range %d!\n", str.c_str(), range_left - range_right + 1);
RTLIL::Wire *wire = current_module->addWire(str, range_left - range_right + 1);
@@ -1205,13 +1212,18 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
AstNode *fake_ast = new AstNode(AST_NONE, clone(), children[0]->children.size() >= 2 ?
children[0]->children[1]->clone() : children[0]->children[0]->clone());
fake_ast->children[0]->delete_children();
- RTLIL::SigSpec shift_val = fake_ast->children[1]->genRTLIL();
+
+ int fake_ast_width = 0;
+ bool fake_ast_sign = true;
+ fake_ast->children[1]->detectSignWidth(fake_ast_width, fake_ast_sign);
+ RTLIL::SigSpec shift_val = fake_ast->children[1]->genRTLIL(fake_ast_width, fake_ast_sign);
+
if (id2ast->range_right != 0) {
- shift_val = current_module->Sub(NEW_ID, shift_val, id2ast->range_right, fake_ast->children[1]->is_signed);
+ shift_val = current_module->Sub(NEW_ID, shift_val, id2ast->range_right, fake_ast_sign);
fake_ast->children[1]->is_signed = true;
}
if (id2ast->range_swapped) {
- shift_val = current_module->Sub(NEW_ID, RTLIL::SigSpec(source_width - width), shift_val, fake_ast->children[1]->is_signed);
+ shift_val = current_module->Sub(NEW_ID, RTLIL::SigSpec(source_width - width), shift_val, fake_ast_sign);
fake_ast->children[1]->is_signed = true;
}
if (GetSize(shift_val) >= 32)
@@ -1265,7 +1277,8 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
// just pass thru the signal. the parent will evaluate the is_signed property and interpret the SigSpec accordingly
case AST_TO_SIGNED:
- case AST_TO_UNSIGNED: {
+ case AST_TO_UNSIGNED:
+ case AST_SELFSZ: {
RTLIL::SigSpec sig = children[0]->genRTLIL();
if (sig.size() < width_hint)
sig.extend_u0(width_hint, sign_hint);
@@ -1356,6 +1369,8 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
if (0) { case AST_SHIFT_RIGHT: type_name = ID($shr); }
if (0) { case AST_SHIFT_SLEFT: type_name = ID($sshl); }
if (0) { case AST_SHIFT_SRIGHT: type_name = ID($sshr); }
+ if (0) { case AST_SHIFTX: type_name = ID($shiftx); }
+ if (0) { case AST_SHIFT: type_name = ID($shift); }
{
if (width_hint < 0)
detectSignWidth(width_hint, sign_hint);
@@ -1807,7 +1822,8 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
is_signed = sign_hint;
return SigSpec(wire);
}
- } /* fall through */
+ }
+ YS_FALLTHROUGH
// everything should have been handled above -> print error if not.
default:
diff --git a/frontends/ast/simplify.cc b/frontends/ast/simplify.cc
index 252219094..3314819fb 100644
--- a/frontends/ast/simplify.cc
+++ b/frontends/ast/simplify.cc
@@ -91,7 +91,7 @@ std::string AstNode::process_format_str(const std::string &sformat, int next_arg
case 'D':
if (got_len)
goto unsupported_format;
- /* fall through */
+ YS_FALLTHROUGH
case 'x':
case 'X':
if (next_arg >= GetSize(children))
@@ -608,6 +608,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
case AST_TO_BITS:
case AST_TO_SIGNED:
case AST_TO_UNSIGNED:
+ case AST_SELFSZ:
case AST_CONCAT:
case AST_REPLICATE:
case AST_REDUCE_AND:
@@ -1079,7 +1080,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
}
if (old_range_valid != range_valid)
did_something = true;
- if (range_valid && range_left >= 0 && range_right > range_left) {
+ if (range_valid && range_right > range_left) {
int tmp = range_right;
range_right = range_left;
range_left = tmp;
@@ -1097,6 +1098,25 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
range_swapped = children[0]->range_swapped;
range_left = children[0]->range_left;
range_right = children[0]->range_right;
+ bool force_upto = false, force_downto = false;
+ if (attributes.count(ID::force_upto)) {
+ AstNode *val = attributes[ID::force_upto];
+ if (val->type != AST_CONSTANT)
+ log_file_error(filename, location.first_line, "Attribute `force_upto' with non-constant value!\n");
+ force_upto = val->asAttrConst().as_bool();
+ }
+ if (attributes.count(ID::force_downto)) {
+ AstNode *val = attributes[ID::force_downto];
+ if (val->type != AST_CONSTANT)
+ log_file_error(filename, location.first_line, "Attribute `force_downto' with non-constant value!\n");
+ force_downto = val->asAttrConst().as_bool();
+ }
+ if (force_upto && force_downto)
+ log_file_error(filename, location.first_line, "Attributes `force_downto' and `force_upto' cannot be both set!\n");
+ if ((force_upto && !range_swapped) || (force_downto && range_swapped)) {
+ std::swap(range_left, range_right);
+ range_swapped = force_upto;
+ }
}
} else {
if (!range_valid)
@@ -1788,7 +1808,18 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
result_width = abs(int(left_at_zero_ast->integer - right_at_zero_ast->integer)) + 1;
}
- if (0)
+ bool use_case_method = false;
+
+ if (children[0]->id2ast->attributes.count(ID::nowrshmsk)) {
+ AstNode *node = children[0]->id2ast->attributes.at(ID::nowrshmsk);
+ while (node->simplify(true, false, false, stage, -1, false, false)) { }
+ if (node->type != AST_CONSTANT)
+ log_file_error(filename, location.first_line, "Non-constant value for `nowrshmsk' attribute on `%s'!\n", children[0]->id2ast->str.c_str());
+ if (node->asAttrConst().as_bool())
+ use_case_method = true;
+ }
+
+ if (use_case_method)
{
// big case block
@@ -1796,10 +1827,10 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
newNode = new AstNode(AST_CASE, shift_expr);
for (int i = 0; i < source_width; i++) {
int start_bit = children[0]->id2ast->range_right + i;
+ int end_bit = std::min(start_bit+result_width,source_width) - 1;
AstNode *cond = new AstNode(AST_COND, mkconst_int(start_bit, true));
AstNode *lvalue = children[0]->clone();
lvalue->delete_children();
- int end_bit = std::min(start_bit+result_width,source_width) - 1;
lvalue->children.push_back(new AstNode(AST_RANGE,
mkconst_int(end_bit, true), mkconst_int(start_bit, true)));
cond->children.push_back(new AstNode(AST_BLOCK, new AstNode(type, lvalue, children[1]->clone())));
@@ -1846,11 +1877,40 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
AstNode *shamt = shift_expr;
- newNode->children.push_back(new AstNode(AST_ASSIGN_EQ, ref_mask->clone(),
- new AstNode(AST_SHIFT_LEFT, mkconst_bits(std::vector<RTLIL::State>(result_width, State::S1), false), shamt->clone())));
- newNode->children.push_back(new AstNode(AST_ASSIGN_EQ, ref_data->clone(),
- new AstNode(AST_SHIFT_LEFT, new AstNode(AST_BIT_AND, mkconst_bits(std::vector<RTLIL::State>(result_width, State::S1), false), children[1]->clone()), shamt)));
- newNode->children.push_back(new AstNode(type, lvalue, new AstNode(AST_BIT_OR, new AstNode(AST_BIT_AND, old_data, new AstNode(AST_BIT_NOT, ref_mask)), ref_data)));
+ int shamt_width_hint = 0;
+ bool shamt_sign_hint = true;
+ shamt->detectSignWidth(shamt_width_hint, shamt_sign_hint);
+
+ int start_bit = children[0]->id2ast->range_right;
+ bool use_shift = shamt_sign_hint;
+
+ if (start_bit != 0) {
+ shamt = new AstNode(AST_SUB, shamt, mkconst_int(start_bit, true));
+ use_shift = true;
+ }
+
+ AstNode *t;
+
+ t = mkconst_bits(std::vector<RTLIL::State>(result_width, State::S1), false);
+ if (use_shift)
+ t = new AstNode(AST_SHIFT, t, new AstNode(AST_NEG, shamt->clone()));
+ else
+ t = new AstNode(AST_SHIFT_LEFT, t, shamt->clone());
+ t = new AstNode(AST_ASSIGN_EQ, ref_mask->clone(), t);
+ newNode->children.push_back(t);
+
+ t = new AstNode(AST_BIT_AND, mkconst_bits(std::vector<RTLIL::State>(result_width, State::S1), false), children[1]->clone());
+ if (use_shift)
+ t = new AstNode(AST_SHIFT, t, new AstNode(AST_NEG, shamt));
+ else
+ t = new AstNode(AST_SHIFT_LEFT, t, shamt);
+ t = new AstNode(AST_ASSIGN_EQ, ref_data->clone(), t);
+ newNode->children.push_back(t);
+
+ t = new AstNode(AST_BIT_AND, old_data, new AstNode(AST_BIT_NOT, ref_mask));
+ t = new AstNode(AST_BIT_OR, t, ref_data);
+ t = new AstNode(type, lvalue, t);
+ newNode->children.push_back(t);
}
goto apply_newNode;
@@ -3026,6 +3086,7 @@ replace_fcall_later:;
}
}
break;
+ if (0) { case AST_SELFSZ: const_func = RTLIL::const_pos; }
if (0) { case AST_POS: const_func = RTLIL::const_pos; }
if (0) { case AST_NEG: const_func = RTLIL::const_neg; }
if (children[0]->type == AST_CONSTANT) {
@@ -3034,10 +3095,10 @@ replace_fcall_later:;
} else
if (children[0]->isConst()) {
newNode = new AstNode(AST_REALVALUE);
- if (type == AST_POS)
- newNode->realvalue = +children[0]->asReal(sign_hint);
- else
+ if (type == AST_NEG)
newNode->realvalue = -children[0]->asReal(sign_hint);
+ else
+ newNode->realvalue = +children[0]->asReal(sign_hint);
}
break;
case AST_TERNARY:
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-09 00:23:48 +0000