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himbaechel: Fix when more then 32k unique node shapes

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Signed-off-by: gatecat <gatecat@ds0.me>
This commit is contained in:
gatecat 2023-11-22 16:30:49 +01:00 committed by myrtle
parent 55635cf2cd
commit 6683fd4ada
1 changed files with 7 additions and 1 deletions
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8
himbaechel/himbaechel_dbgen/chip.py
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@ -706,6 +706,12 @@ class Chip:
self.timing.set_speed_grades(speed_grades)
return self.timing
def add_node(self, wires: list[NodeWire], timing_class=""):
# encode a 0..65535 unsigned value into -32768..32767 signed value so struct.pack doesn't complain
# (we use the same field as signed and unsigned in different modes)
def _twos(x):
if x & 0x8000:
x = x - 0x10000
return x
# add a node - joining between multiple tile wires into a single connection (from nextpnr's point of view)
# all the tile wires must exist, and the tile types must be set, first
x0 = wires[0].x
@ -739,7 +745,7 @@ class Chip:
# so we re-use the structure to store the index of the node shape, instead
assert inst.shape.wire_to_node[3*wire_idx+0] == MODE_TILE_WIRE, "attempting to add wire to multiple nodes!"
inst.shape.wire_to_node[3*wire_idx+0] = MODE_IS_ROOT
inst.shape.wire_to_node[3*wire_idx+1] = (shape_idx & 0xFFFF)
inst.shape.wire_to_node[3*wire_idx+1] = _twos(shape_idx & 0xFFFF)
inst.shape.wire_to_node[3*wire_idx+2] = ((shape_idx >> 16) & 0xFFFF)
else:
# back-reference to the root of the node