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add bwmux, bweqx, bmux, demux cells

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This commit is contained in:
Emily Schmidt 2024-07-12 10:45:58 +01:00
parent 6e7ae88c6a
commit 9ad859fc0a
1 changed files with 56 additions and 24 deletions
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38
kernel/functionalir.cc
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@ -96,6 +96,15 @@ private:
}
return r;
}
T handle_bmux(T a, T s, int a_width, int a_offset, int width, int s_width, int sn) {
if(sn < 1)
return factory.slice(a, a_width, a_offset, width);
else {
T y0 = handle_bmux(a, s, a_width, a_offset, width, s_width, sn - 1);
T y1 = handle_bmux(a, s, a_width, a_offset + (width << (sn - 1)), width, s_width, sn - 1);
return factory.mux(y0, y1, factory.slice(s, s_width, sn - 1, 1), width);
}
}
public:
T handle(IdString cellType, dict<IdString, Const> parameters, dict<IdString, T> inputs)
{
@ -253,10 +262,8 @@ public:
int width = parameters.at(ID(WIDTH)).as_int();
Const lut_table = parameters.at(ID(LUT));
T a = inputs.at(ID(A));
// Output initialization
T y = factory.constant(Const(0, 1));
// Iterate over each possible input combination
for (int i = 0; i < (1 << width); ++i) {
// Create a constant representing the value of i
@ -269,8 +276,33 @@ public:
// Use a multiplexer to select the correct output based on the match
y = factory.mux(y, lut_output, match, 1);
}
return y;
} else if (cellType == ID($bwmux)) {
int width = parameters.at(ID(WIDTH)).as_int();
T a = inputs.at(ID(A));
T b = inputs.at(ID(B));
T s = inputs.at(ID(S));
return factory.bitwise_or(
factory.bitwise_and(a, factory.bitwise_not(s, width), width),
factory.bitwise_and(b, s, width), width);
} else if (cellType == ID($bweqx)) {
int width = parameters.at(ID(WIDTH)).as_int();
T a = inputs.at(ID(A));
T b = inputs.at(ID(B));
return factory.bitwise_not(factory.bitwise_xor(a, b, width), width);
} else if(cellType == ID($bmux)) {
int width = parameters.at(ID(WIDTH)).as_int();
int s_width = parameters.at(ID(S_WIDTH)).as_int();
return handle_bmux(inputs.at(ID(A)), inputs.at(ID(S)), width << s_width, 0, width, s_width, s_width);
} else if(cellType == ID($demux)) {
int width = parameters.at(ID(WIDTH)).as_int();
int s_width = parameters.at(ID(S_WIDTH)).as_int();
int y_width = width << s_width;
int b_width = ceil_log2(y_width + 1);
T a = extend(inputs.at(ID(A)), width, y_width, false);
T s = factory.extend(inputs.at(ID(S)), s_width, b_width, false);
T b = factory.mul(s, factory.constant(Const(width, b_width)), b_width);
return factory.logical_shift_left(a, b, y_width, b_width);
} else {
log_error("unhandled cell in CellSimplifier %s\n", cellType.c_str());
}