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Support IVL_EX_DELAY in VHDL target 

This patch adds a translation of 64-bit delay expressions to
vhdl_const_time objects.
This commit is contained in:
Nick Gasson 2009-02-19 21:22:04 +00:00 committed by Stephen Williams
parent 6828620977
commit 5660e67b8b
2 changed files with 19 additions and 8 deletions
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23
tgt-vhdl/expr.cc
View File

@ -134,6 +134,11 @@ static vhdl_expr *translate_ulong(ivl_expr_t e)
return new vhdl_const_int(ivl_expr_uvalue(e));
}
static vhdl_expr *translate_delay(ivl_expr_t e)
{
return new vhdl_const_time(ivl_expr_delay_val(e), TIME_UNIT_NS);
}
static vhdl_expr *translate_reduction(support_function_t f, bool neg,
vhdl_expr *operand)
{
@ -684,6 +689,8 @@ vhdl_expr *translate_expr(ivl_expr_t e)
return translate_concat(e);
case IVL_EX_SFUNC:
return translate_sfunc(e);
case IVL_EX_DELAY:
return translate_delay(e);
case IVL_EX_REALNUM:
error("No VHDL translation for real expression at %s:%d",
ivl_expr_file(e), ivl_expr_lineno(e));
@ -705,10 +712,14 @@ vhdl_expr *translate_time_expr(ivl_expr_t e)
if (NULL == time)
return NULL;
vhdl_type integer(VHDL_TYPE_INTEGER);
time = time->cast(&integer);
vhdl_expr *ns1 = new vhdl_const_time(1, TIME_UNIT_NS);
return new vhdl_binop_expr(time, VHDL_BINOP_MULT, ns1,
vhdl_type::time());
if (time->get_type()->get_name() != VHDL_TYPE_TIME) {
vhdl_type integer(VHDL_TYPE_INTEGER);
time = time->cast(&integer);
vhdl_expr *ns1 = new vhdl_const_time(1, TIME_UNIT_NS);
return new vhdl_binop_expr(time, VHDL_BINOP_MULT, ns1,
vhdl_type::time());
}
else // Translating IVL_EX_DELAY will always return a time type
return time;
}

4
tgt-vhdl/vhdl_syntax.hh
View File

@ -208,11 +208,11 @@ enum time_unit_t {
class vhdl_const_time : public vhdl_expr {
public:
vhdl_const_time(int64_t value, time_unit_t units = TIME_UNIT_NS)
vhdl_const_time(uint64_t value, time_unit_t units = TIME_UNIT_NS)
: vhdl_expr(vhdl_type::time(), true), value_(value), units_(units) {}
void emit(std::ostream &of, int level) const;
private:
int64_t value_;
uint64_t value_;
time_unit_t units_;
};