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Progress in shiftmul peepopt pattern 

Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2019-04-30 07:59:39 +02:00
parent ea547bcaa3
commit 58238da133
1 changed files with 51 additions and 3 deletions
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54
passes/pmgen/peepopt.pmg
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@ -13,9 +13,11 @@ code shamt
shamt.remove(GetSize(shamt)-1);
} while (shamt[GetSize(shamt)-1] == State::S0);
} else
if (param(shift, \B_SIGNED).as_bool()) {
if (shift->type.in($shift, $shiftx) && param(shift, \B_SIGNED).as_bool()) {
reject;
}
if (GetSize(shamt) > 20)
reject;
endcode
match mul
@ -26,9 +28,55 @@ endmatch
code
IdString const_factor_port = port(mul, \A).is_fully_const() ? \A : \B;
int const_factor = port(mul, const_factor_port).as_int();
IdString const_factor_signed = const_factor_port == \A ? \A_SIGNED : \B_SIGNED;
Const const_factor_cnst = port(mul, const_factor_port).as_const();
int const_factor = const_factor_cnst.as_int();
if (GetSize(const_factor_cnst) == 0)
reject;
if (const_factor_cnst.bits[GetSize(const_factor_cnst)-1] != State::S0 &&
param(mul, const_factor_signed).as_bool())
reject;
if (GetSize(const_factor_cnst) > 20)
reject;
if (GetSize(port(shift, \Y)) > const_factor)
reject;
log_dump(shift, shamt, mul, const_factor);
log("shiftmul pattern in %s: shift=%s, mul=%s\n", log_id(module), log_id(shift), log_id(mul));
int new_const_factor_log2 = ceil_log2(const_factor);
int new_const_factor = 1 << new_const_factor_log2;
SigSpec padding(State::Sx, new_const_factor-const_factor);
SigSpec old_a = port(shift, \A), new_a;
int trunc = 0;
if (GetSize(old_a) % const_factor != 0) {
trunc = const_factor - GetSize(old_a) % const_factor;
old_a.append(SigSpec(State::Sx, trunc));
}
for (int i = 0; i*const_factor < GetSize(old_a); i++) {
SigSpec slice = old_a.extract(i*const_factor, const_factor);
new_a.append(slice);
new_a.append(padding);
}
if (trunc > 0)
new_a.remove(GetSize(new_a)-trunc, trunc);
SigSpec new_b = {port(mul, const_factor_port == \A ? \B : \A), SigSpec(State::S0, new_const_factor_log2)};
if (param(shift, \B_SIGNED).as_bool())
new_b.append(State::S0);
shift->setPort(\A, new_a);
shift->setParam(\A_WIDTH, GetSize(new_a));
shift->setPort(\B, new_b);
shift->setParam(\B_WIDTH, GetSize(new_b));
blacklist(shift);
reject;
endcode