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vvp: concat: Avoid using individual bit access

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The concat functors use individual bit access to initialize and copy
values.

For initialization pass the initial bit value to the constructor and for
coping use set_vec() instead. Both can be a fair bit faster since data is
copied word by word rather than bit by bit.

Signed-off-by: Lars-Peter Clausen <[email protected]>
This commit is contained in:
Lars-Peter Clausen
2024-01-20 10:32:55 -08:00
parent bb1d3c9ac6
commit 4637b39953
1 changed files with 7 additions and 28 deletions
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vvp/concat.cc
+7 -28
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@@ -27,15 +27,12 @@ using namespace std;
vvp_fun_concat::vvp_fun_concat(unsigned w0, unsigned w1,
unsigned w2, unsigned w3)
: val_(w0+w1+w2+w3)
: val_(w0+w1+w2+w3, BIT4_Z)
{
wid_[0] = w0;
wid_[1] = w1;
wid_[2] = w2;
wid_[3] = w3;
for (unsigned idx = 0 ; idx < val_.size() ; idx += 1)
val_.set_bit(idx, BIT4_Z);
}
vvp_fun_concat::~vvp_fun_concat()
@@ -52,7 +49,6 @@ void vvp_fun_concat::recv_vec4_pv(vvp_net_ptr_t port, const vvp_vector4_t&bit,
unsigned base, unsigned vwid, vvp_context_t)
{
unsigned pdx = port.port();
unsigned wid = bit.size();
if (vwid != wid_[pdx]) {
cerr << "internal error: port " << pdx
@@ -61,17 +57,12 @@ void vvp_fun_concat::recv_vec4_pv(vvp_net_ptr_t port, const vvp_vector4_t&bit,
assert(0);
}
unsigned off = 0;
unsigned off = base;
for (unsigned idx = 0 ; idx < pdx ; idx += 1)
off += wid_[idx];
unsigned limit = off + wid_[pdx];
off += base;
for (unsigned idx = 0 ; idx < wid ; idx += 1) {
if (off+idx >= limit) break;
val_.set_bit(off+idx, bit.value(idx));
}
if (!val_.set_vec(off, bit))
return;
port.ptr()->send_vec4(val_, 0);
}
@@ -101,9 +92,6 @@ vvp_fun_concat8::vvp_fun_concat8(unsigned w0, unsigned w1,
wid_[1] = w1;
wid_[2] = w2;
wid_[3] = w3;
for (unsigned idx = 0 ; idx < val_.size() ; idx += 1)
val_.set_bit(idx, vvp_scalar_t(BIT4_Z, 0, 0));
}
vvp_fun_concat8::~vvp_fun_concat8()
@@ -133,7 +121,6 @@ void vvp_fun_concat8::recv_vec8_pv(vvp_net_ptr_t port, const vvp_vector8_t&bit,
unsigned base, unsigned vwid)
{
unsigned pdx = port.port();
unsigned wid = bit.size();
if (vwid != wid_[pdx]) {
cerr << "internal error: port " << pdx
@@ -142,17 +129,11 @@ void vvp_fun_concat8::recv_vec8_pv(vvp_net_ptr_t port, const vvp_vector8_t&bit,
assert(0);
}
unsigned off = 0;
unsigned off = base;
for (unsigned idx = 0 ; idx < pdx ; idx += 1)
off += wid_[idx];
unsigned limit = off + wid_[pdx];
off += base;
for (unsigned idx = 0 ; idx < wid ; idx += 1) {
if (off+idx >= limit) break;
val_.set_bit(off+idx, bit.value(idx));
}
val_.set_vec(off, bit);
port.ptr()->send_vec8(val_);
}
@@ -192,9 +173,7 @@ void vvp_fun_repeat::recv_vec4(vvp_net_ptr_t port, const vvp_vector4_t&bit,
for (unsigned rdx = 0 ; rdx < rep_ ; rdx += 1) {
unsigned off = rdx * bit.size();
for (unsigned idx = 0 ; idx < bit.size() ; idx += 1)
val.set_bit(off+idx, bit.value(idx));
val.set_vec(off, bit);
}
port.ptr()->send_vec4(val, 0);