comb += reset_s.eq(self.go_st_i | self.go_die_i)
comb += reset_r.eq(self.go_rd_i | self.go_die_i)
# this one is slightly different, issue_alu_i selects go_wr_i)
- a_sel = Mux(self.isalu_i, self.go_wr_i, self.go_ad_i )
+ a_sel = Mux(self.isalu_i, self.go_wr_i, self.go_ad_i)
comb += reset_a.eq(a_sel| self.go_die_i)
# opcode decode
comb += self.sto_rel_o.eq(sto_l.q & busy_o & self.shadown_i)
# address release only happens on LD/ST, and is shadowed.
- comb += self.adr_rel_o.eq(adr_l.q & op_ldst & busy_o & self.shadownn_i)
+ comb += self.adr_rel_o.eq(adr_l.q & op_ldst & busy_o & self.shadown_i)
# request release enabled based on if op is a LD/ST or a plain ALU
# if op is a LD/ST, req_rel activates from the *address* latch
latchregister(m, src2_or_imm, self.alu.b, src_sel)
# create a latch/register for the operand
- latchregister(m, Cat(op_alu, 0), self.alu.op, self.issue_i)
+ alu_op = Cat(op_alu, 0, op_is_imm) # using alu_hier, here.
+ latchregister(m, alu_op, self.alu.op, self.issue_i)
# and one for the output from the ALU
data_r = Signal(self.rwid, reset_less=True) # Dest register
from scoreboard.issue_unit import IssueUnitGroup, IssueUnitArray, RegDecode
from scoreboard.shadow import ShadowMatrix, BranchSpeculationRecord
from scoreboard.instruction_q import Instruction, InstructionQ
+from scoreboard.memfu import MemFunctionUnits
from compalu import ComputationUnitNoDelay
+from compldst import LDSTCompUnit
from alu_hier import ALU, BranchALU
from nmutil.latch import SRLatch
Computation Unit" as defined by Mitch Alsup (see section
11.4.9.3)
"""
- def __init__(self, rwid, units):
+ def __init__(self, rwid, units, ldstmode=False):
""" Inputs:
* :rwid: bit width of register file(s) - both FP and INT
* :units: sequence of ALUs (or CompUnitsBase derivatives)
"""
self.units = units
+ self.ldstmode = ldstmode
self.rwid = rwid
self.rwid = rwid
if units and isinstance(units[0], CompUnitsBase):
self.go_wr_i = Signal(n_units, reset_less=True)
self.shadown_i = Signal(n_units, reset_less=True)
self.go_die_i = Signal(n_units, reset_less=True)
+ if ldstmode:
+ self.go_ad_i = Signal(n_units, reset_less=True)
# outputs
self.busy_o = Signal(n_units, reset_less=True)
self.rd_rel_o = Signal(n_units, reset_less=True)
self.req_rel_o = Signal(n_units, reset_less=True)
+ if ldstmode:
+ self.adr_rel_o = Signal(n_units, reset_less=True)
+ self.sto_rel_o = Signal(n_units, reset_less=True)
+ self.req_rel_o = Signal(n_units, reset_less=True)
+ self.load_mem_o = Signal(n_units, reset_less=True)
+ self.stwd_mem_o = Signal(n_units, reset_less=True)
# in/out register data (note: not register#, actual data)
self.data_o = Signal(rwid, reset_less=True)
comb += alu.src1_i.eq(self.src1_i)
comb += alu.src2_i.eq(self.src2_i)
+ if not self.ldstmode:
+ return m
+
+ ldmem_l = []
+ stmem_l = []
+ go_ad_l = []
+ adr_rel_l = []
+ sto_rel_l = []
+ for alu in self.units:
+ adr_rel_l.append(alu.adr_rel_o)
+ sto_rel_l.append(alu.sto_rel_o)
+ ldmem_l.append(alu.load_mem_o)
+ stmem_l.append(alu.stwd_mem_o)
+ go_ad_l.append(alu.go_ad_i)
+ comb += self.adr_rel_o.eq(Cat(*adr_rel_l))
+ comb += self.sto_rel_o.eq(Cat(*sto_rel_l))
+ comb += self.load_mem_o.eq(Cat(*ldmem_l))
+ comb += self.stwd_mem_o.eq(Cat(*stmem_l))
+ comb += Cat(*go_ad_l).eq(self.go_ad_i)
+
+ return m
+
+
+class CompUnitLDSTs(CompUnitsBase):
+
+ def __init__(self, rwid, opwid, mem):
+ """ Inputs:
+
+ * :rwid: bit width of register file(s) - both FP and INT
+ * :opwid: operand bit width
+ """
+ self.opwid = opwid
+
+ # inputs
+ self.oper_i = Signal(opwid, reset_less=True)
+ self.imm_i = Signal(rwid, reset_less=True)
+
+ # Int ALUs
+ add1 = ALU(rwid)
+ add2 = ALU(rwid)
+
+ units = []
+ for alu in [add1, add2]:
+ aluopwid = 4 # see compldst.py for "internal" opcode
+ units.append(LDSTCompUnit(rwid, aluopwid, alu, mem))
+
+ CompUnitsBase.__init__(self, rwid, units, ldstmode=True)
+
+ def elaborate(self, platform):
+ m = CompUnitsBase.elaborate(self, platform)
+ comb = m.d.comb
+
+ # hand the same operation to all units, 4 lower bits though
+ for alu in self.units:
+ comb += alu.oper_i[0:4].eq(self.oper_i)
+ comb += alu.imm_i.eq(self.imm_i)
+ comb += alu.isalu_i.eq(0)
+
return m
class CompUnitALUs(CompUnitsBase):
- def __init__(self, rwid, opwid):
+ def __init__(self, rwid, opwid, n_alus):
""" Inputs:
* :rwid: bit width of register file(s) - both FP and INT
self.imm_i = Signal(rwid, reset_less=True)
# Int ALUs
- add = ALU(rwid)
- sub = ALU(rwid)
- mul = ALU(rwid)
- shf = ALU(rwid)
+ alus = []
+ for i in range(n_alus):
+ alus.append(ALU(rwid))
units = []
- for alu in [add, sub, mul, shf]:
+ for alu in alus:
aluopwid = 3 # extra bit for immediate mode
units.append(ComputationUnitNoDelay(rwid, aluopwid, alu))
m = CompUnitsBase.elaborate(self, platform)
comb = m.d.comb
- # hand the same operation to all units, only lower 2 bits though
+ # hand the same operation to all units, only lower 3 bits though
for alu in self.units:
comb += alu.oper_i[0:3].eq(self.oper_i)
comb += alu.imm_i.eq(self.imm_i)
fp_src1 = self.fpregs.read_port("src1")
fp_src2 = self.fpregs.read_port("src2")
- # Int ALUs and Comp Units
+ # Int ALUs and BR ALUs
n_int_alus = 5
- cua = CompUnitALUs(self.rwid, 3)
- cub = CompUnitBR(self.rwid, 3)
- m.submodules.cu = cu = CompUnitsBase(self.rwid, [cua, cub])
+ cua = CompUnitALUs(self.rwid, 3, n_alus=4)
+ cub = CompUnitBR(self.rwid, 3) # 1 BR ALUs
+
+ # LDST Comp Units
+ n_ldsts = 2
+ cul = CompUnitLDSTs(self.rwid, 3, None)
+
+ # Comp Units
+ m.submodules.cu = cu = CompUnitsBase(self.rwid, [cua, cub, cul])
bgt = cub.bgt # get at the branch computation unit
br1 = cub.br1
# Int FUs
m.submodules.intfus = intfus = FunctionUnits(self.n_regs, n_int_alus)
+ # Memory FUs
+ m.submodules.memfus = memfus = MemFunctionUnits(n_ldsts, 11)
+
# Count of number of FUs
n_intfus = n_int_alus
n_fp_fus = 0 # for now
- # Integer Priority Picker 1: Adder + Subtractor
- intpick1 = GroupPicker(n_intfus) # picks between add, sub, mul and shf
+ # Integer Priority Picker 1: Adder + Subtractor (and LD/ST)
+ intpick1 = GroupPicker(n_intfus) # picks 1 reader and 1 writer to intreg
m.submodules.intpick1 = intpick1
# INT/FP Issue Unit
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