# See Notices.txt for copyright information
from nmigen import Signal, Module, Elaboratable
-from nmigen.back.pysim import Simulator, Delay, Tick, Passive
-from nmigen.cli import verilog, rtlil
+from nmigen.back.pysim import Simulator, Delay
+from nmigen.cli import rtlil
from ieee754.part.partsig import PartitionedSignal
+from ieee754.part_mux.part_mux import PMux
+from random import randint
import unittest
+import itertools
+import math
+
+def first_zero(x):
+ res = 0
+ for i in range(16):
+ if x & (1<<i):
+ return res
+ res += 1
+
+def count_bits(x):
+ res = 0
+ for i in range(16):
+ if x & (1<<i):
+ res += 1
+ return res
+
+
+def perms(k):
+ return map(''.join, itertools.product('01', repeat=k))
+
def create_ilang(dut, traces, test_name):
vl = rtlil.convert(dut, ports=traces)
def create_simulator(module, traces, test_name):
create_ilang(module, traces, test_name)
- return Simulator(module,
- vcd_file=open(test_name + ".vcd", "w"),
- gtkw_file=open(test_name + ".gtkw", "w"),
- traces=traces)
+ return Simulator(module)
+
+
+# XXX this is for coriolis2 experimentation
+class TestAddMod2(Elaboratable):
+ def __init__(self, width, partpoints):
+ self.partpoints = partpoints
+ self.a = PartitionedSignal(partpoints, width)
+ self.b = PartitionedSignal(partpoints, width)
+ self.bsig = Signal(width)
+ self.add_output = Signal(width)
+ self.ls_output = Signal(width) # left shift
+ self.ls_scal_output = Signal(width) # left shift
+ self.rs_output = Signal(width) # right shift
+ self.rs_scal_output = Signal(width) # right shift
+ self.sub_output = Signal(width)
+ self.eq_output = Signal(len(partpoints)+1)
+ self.gt_output = Signal(len(partpoints)+1)
+ self.ge_output = Signal(len(partpoints)+1)
+ self.ne_output = Signal(len(partpoints)+1)
+ self.lt_output = Signal(len(partpoints)+1)
+ self.le_output = Signal(len(partpoints)+1)
+ self.mux_sel = Signal(len(partpoints)+1)
+ self.mux_out = Signal(width)
+ self.carry_in = Signal(len(partpoints)+1)
+ self.add_carry_out = Signal(len(partpoints)+1)
+ self.sub_carry_out = Signal(len(partpoints)+1)
+ self.neg_output = Signal(width)
+
+ def elaborate(self, platform):
+ m = Module()
+ comb = m.d.comb
+ sync = m.d.sync
+ self.a.set_module(m)
+ self.b.set_module(m)
+ # compares
+ sync += self.lt_output.eq(self.a < self.b)
+ sync += self.ne_output.eq(self.a != self.b)
+ sync += self.le_output.eq(self.a <= self.b)
+ sync += self.gt_output.eq(self.a > self.b)
+ sync += self.eq_output.eq(self.a == self.b)
+ sync += self.ge_output.eq(self.a >= self.b)
+ # add
+ add_out, add_carry = self.a.add_op(self.a, self.b,
+ self.carry_in)
+ sync += self.add_output.eq(add_out)
+ sync += self.add_carry_out.eq(add_carry)
+ # sub
+ sub_out, sub_carry = self.a.sub_op(self.a, self.b,
+ self.carry_in)
+ sync += self.sub_output.eq(sub_out)
+ sync += self.sub_carry_out.eq(sub_carry)
+ # neg
+ sync += self.neg_output.eq(-self.a)
+ # left shift
+ sync += self.ls_output.eq(self.a << self.b)
+ sync += self.rs_output.eq(self.a >> self.b)
+ ppts = self.partpoints
+ sync += self.mux_out.eq(PMux(m, ppts, self.mux_sel, self.a, self.b))
+ # scalar left shift
+ comb += self.bsig.eq(self.b.sig)
+ sync += self.ls_scal_output.eq(self.a << self.bsig)
+ sync += self.rs_scal_output.eq(self.a >> self.bsig)
+
+ return m
+
class TestAddMod(Elaboratable):
def __init__(self, width, partpoints):
+ self.partpoints = partpoints
self.a = PartitionedSignal(partpoints, width)
self.b = PartitionedSignal(partpoints, width)
+ self.bsig = Signal(width)
self.add_output = Signal(width)
+ self.ls_output = Signal(width) # left shift
+ self.ls_scal_output = Signal(width) # left shift
+ self.rs_output = Signal(width) # right shift
+ self.rs_scal_output = Signal(width) # right shift
+ self.sub_output = Signal(width)
self.eq_output = Signal(len(partpoints)+1)
self.gt_output = Signal(len(partpoints)+1)
+ self.ge_output = Signal(len(partpoints)+1)
+ self.ne_output = Signal(len(partpoints)+1)
+ self.lt_output = Signal(len(partpoints)+1)
+ self.le_output = Signal(len(partpoints)+1)
+ self.mux_sel = Signal(len(partpoints)+1)
+ self.mux_out = Signal(width)
+ self.carry_in = Signal(len(partpoints)+1)
+ self.add_carry_out = Signal(len(partpoints)+1)
+ self.sub_carry_out = Signal(len(partpoints)+1)
+ self.neg_output = Signal(width)
def elaborate(self, platform):
m = Module()
+ comb = m.d.comb
+ sync = m.d.sync
self.a.set_module(m)
self.b.set_module(m)
- m.d.comb += self.gt_output.eq(self.a > self.b)
- m.d.comb += self.eq_output.eq(self.a == self.b)
- m.d.comb += self.add_output.eq(self.a + self.b)
+ # compares
+ comb += self.lt_output.eq(self.a < self.b)
+ comb += self.ne_output.eq(self.a != self.b)
+ comb += self.le_output.eq(self.a <= self.b)
+ comb += self.gt_output.eq(self.a > self.b)
+ comb += self.eq_output.eq(self.a == self.b)
+ comb += self.ge_output.eq(self.a >= self.b)
+ # add
+ add_out, add_carry = self.a.add_op(self.a, self.b,
+ self.carry_in)
+ comb += self.add_output.eq(add_out)
+ comb += self.add_carry_out.eq(add_carry)
+ # sub
+ sub_out, sub_carry = self.a.sub_op(self.a, self.b,
+ self.carry_in)
+ comb += self.sub_output.eq(sub_out)
+ comb += self.sub_carry_out.eq(sub_carry)
+ # neg
+ comb += self.neg_output.eq(-self.a)
+ # left shift
+ comb += self.ls_output.eq(self.a << self.b)
+ # right shift
+ comb += self.rs_output.eq(self.a >> self.b)
+ ppts = self.partpoints
+ # mux
+ comb += self.mux_out.eq(PMux(m, ppts, self.mux_sel, self.a, self.b))
+ # scalar left shift
+ comb += self.bsig.eq(self.b.sig)
+ comb += self.ls_scal_output.eq(self.a << self.bsig)
+ # scalar right shift
+ comb += self.rs_scal_output.eq(self.a >> self.bsig)
return m
class TestPartitionPoints(unittest.TestCase):
def test(self):
width = 16
- part_mask = Signal(4) # divide into 4-bits
+ part_mask = Signal(4) # divide into 4-bits
module = TestAddMod(width, part_mask)
- sim = create_simulator(module,
- [part_mask,
- module.a.sig,
- module.b.sig,
- module.add_output,
- module.eq_output],
- "part_sig_add")
+ test_name = "part_sig_add"
+ traces = [part_mask,
+ module.a.sig,
+ module.b.sig,
+ module.add_output,
+ module.eq_output]
+ sim = create_simulator(module, traces, test_name)
+
def async_process():
- def test_add(msg_prefix, *mask_list):
+
+ def test_ls_scal_fn(carry_in, a, b, mask):
+ # reduce range of b
+ bits = count_bits(mask)
+ newb = b & ((bits-1))
+ print ("%x %x %x bits %d trunc %x" % \
+ (a, b, mask, bits, newb))
+ b = newb
+ # TODO: carry
+ carry_in = 0
+ lsb = mask & ~(mask-1) if carry_in else 0
+ sum = ((a & mask) << b)
+ result = mask & sum
+ carry = (sum & mask) != sum
+ carry = 0
+ print("res", hex(a), hex(b), hex(sum), hex(mask), hex(result))
+ return result, carry
+
+ def test_rs_scal_fn(carry_in, a, b, mask):
+ # reduce range of b
+ bits = count_bits(mask)
+ newb = b & ((bits-1))
+ print ("%x %x %x bits %d trunc %x" % \
+ (a, b, mask, bits, newb))
+ b = newb
+ # TODO: carry
+ carry_in = 0
+ lsb = mask & ~(mask-1) if carry_in else 0
+ sum = ((a & mask) >> b)
+ result = mask & sum
+ carry = (sum & mask) != sum
+ carry = 0
+ print("res", hex(a), hex(b), hex(sum), hex(mask), hex(result))
+ return result, carry
+
+ def test_ls_fn(carry_in, a, b, mask):
+ # reduce range of b
+ bits = count_bits(mask)
+ fz = first_zero(mask)
+ newb = b & ((bits-1)<<fz)
+ print ("%x %x %x bits %d zero %d trunc %x" % \
+ (a, b, mask, bits, fz, newb))
+ b = newb
+ # TODO: carry
+ carry_in = 0
+ lsb = mask & ~(mask-1) if carry_in else 0
+ b = (b & mask)
+ b = b >>fz
+ sum = ((a & mask) << b)
+ result = mask & sum
+ carry = (sum & mask) != sum
+ carry = 0
+ print("res", hex(a), hex(b), hex(sum), hex(mask), hex(result))
+ return result, carry
+
+ def test_rs_fn(carry_in, a, b, mask):
+ # reduce range of b
+ bits = count_bits(mask)
+ fz = first_zero(mask)
+ newb = b & ((bits-1)<<fz)
+ print ("%x %x %x bits %d zero %d trunc %x" % \
+ (a, b, mask, bits, fz, newb))
+ b = newb
+ # TODO: carry
+ carry_in = 0
+ lsb = mask & ~(mask-1) if carry_in else 0
+ b = (b & mask)
+ b = b >>fz
+ sum = ((a & mask) >> b)
+ result = mask & sum
+ carry = (sum & mask) != sum
+ carry = 0
+ print("res", hex(a), hex(b), hex(sum), hex(mask), hex(result))
+ return result, carry
+
+ def test_add_fn(carry_in, a, b, mask):
+ lsb = mask & ~(mask-1) if carry_in else 0
+ sum = (a & mask) + (b & mask) + lsb
+ result = mask & sum
+ carry = (sum & mask) != sum
+ print(a, b, sum, mask)
+ return result, carry
+
+ def test_sub_fn(carry_in, a, b, mask):
+ lsb = mask & ~(mask-1) if carry_in else 0
+ sum = (a & mask) + (~b & mask) + lsb
+ result = mask & sum
+ carry = (sum & mask) != sum
+ return result, carry
+
+ def test_neg_fn(carry_in, a, b, mask):
+ lsb = mask & ~(mask - 1) # has only LSB of mask set
+ pos = lsb.bit_length() - 1 # find bit position
+ a = (a & mask) >> pos # shift it to the beginning
+ return ((-a) << pos) & mask, 0 # negate and shift it back
+
+ def test_op(msg_prefix, carry, test_fn, mod_attr, *mask_list):
+ rand_data = []
+ for i in range(100):
+ a, b = randint(0, 1 << 16), randint(0, 1 << 16)
+ rand_data.append((a, b))
for a, b in [(0x0000, 0x0000),
(0x1234, 0x1234),
(0xABCD, 0xABCD),
(0xFFFF, 0x0000),
(0x0000, 0x0000),
(0xFFFF, 0xFFFF),
- (0x0000, 0xFFFF)]:
+ (0x0000, 0xFFFF)] + rand_data:
yield module.a.eq(a)
yield module.b.eq(b)
+ carry_sig = 0xf if carry else 0
+ yield module.carry_in.eq(carry_sig)
yield Delay(0.1e-6)
y = 0
- for mask in mask_list:
- y |= mask & ((a & mask) + (b & mask))
- outval = (yield module.add_output)
- msg = f"{msg_prefix}: 0x{a:X} + 0x{b:X}" + \
+ carry_result = 0
+ for i, mask in enumerate(mask_list):
+ print ("i/mask", i, hex(mask))
+ res, c = test_fn(carry, a, b, mask)
+ y |= res
+ lsb = mask & ~(mask - 1)
+ bit_set = int(math.log2(lsb))
+ carry_result |= c << int(bit_set/4)
+ outval = (yield getattr(module, "%s_output" % mod_attr))
+ # TODO: get (and test) carry output as well
+ print(a, b, outval, carry)
+ msg = f"{msg_prefix}: 0x{a:X} {mod_attr} 0x{b:X}" + \
f" => 0x{y:X} != 0x{outval:X}"
self.assertEqual(y, outval, msg)
- yield part_mask.eq(0)
- yield from test_add("16-bit", 0xFFFF)
- yield part_mask.eq(0b10)
- yield from test_add("8-bit", 0xFF00, 0x00FF)
- yield part_mask.eq(0b1111)
- yield from test_add("4-bit", 0xF000, 0x0F00, 0x00F0, 0x000F)
+ if hasattr(module, "%s_carry_out" % mod_attr):
+ c_outval = (yield getattr(module,
+ "%s_carry_out" % mod_attr))
+ msg = f"{msg_prefix}: 0x{a:X} {mod_attr} 0x{b:X}" + \
+ f" => 0x{carry_result:X} != 0x{c_outval:X}"
+ self.assertEqual(carry_result, c_outval, msg)
+
+ for (test_fn, mod_attr) in (
+ (test_ls_scal_fn, "ls_scal"),
+ (test_ls_fn, "ls"),
+ (test_rs_scal_fn, "rs_scal"),
+ (test_rs_fn, "rs"),
+ (test_add_fn, "add"),
+ (test_sub_fn, "sub"),
+ (test_neg_fn, "neg"),
+ ):
+ yield part_mask.eq(0)
+ yield from test_op("16-bit", 1, test_fn, mod_attr, 0xFFFF)
+ yield from test_op("16-bit", 0, test_fn, mod_attr, 0xFFFF)
+ yield part_mask.eq(0b10)
+ yield from test_op("8-bit", 0, test_fn, mod_attr,
+ 0xFF00, 0x00FF)
+ yield from test_op("8-bit", 1, test_fn, mod_attr,
+ 0xFF00, 0x00FF)
+ yield part_mask.eq(0b1111)
+ yield from test_op("4-bit", 0, test_fn, mod_attr,
+ 0xF000, 0x0F00, 0x00F0, 0x000F)
+ yield from test_op("4-bit", 1, test_fn, mod_attr,
+ 0xF000, 0x0F00, 0x00F0, 0x000F)
+
+ def test_ne_fn(a, b, mask):
+ return (a & mask) != (b & mask)
+
+ def test_lt_fn(a, b, mask):
+ return (a & mask) < (b & mask)
+
+ def test_le_fn(a, b, mask):
+ return (a & mask) <= (b & mask)
+
+ def test_eq_fn(a, b, mask):
+ return (a & mask) == (b & mask)
- def test_eq(msg_prefix, *maskbit_list):
+ def test_gt_fn(a, b, mask):
+ return (a & mask) > (b & mask)
+
+ def test_ge_fn(a, b, mask):
+ return (a & mask) >= (b & mask)
+
+ def test_binop(msg_prefix, test_fn, mod_attr, *maskbit_list):
for a, b in [(0x0000, 0x0000),
(0x1234, 0x1234),
(0xABCD, 0xABCD),
(0xFFFF, 0x0000),
(0x0000, 0x0000),
(0xFFFF, 0xFFFF),
- (0x0000, 0xFFFF)]:
+ (0x0000, 0xFFFF),
+ (0xABCD, 0xABCE),
+ (0x8000, 0x0000),
+ (0xBEEF, 0xFEED)]:
yield module.a.eq(a)
yield module.b.eq(b)
yield Delay(0.1e-6)
for mb in maskbit_list:
v = 0
for i in range(4):
- if mb & (1<<i):
+ if mb & (1 << i):
v |= 0xf << (i*4)
mask_list.append(v)
y = 0
# do the partitioned tests
for i, mask in enumerate(mask_list):
- if (a & mask) == (b & mask):
+ if test_fn(a, b, mask):
# OR y with the lowest set bit in the mask
- y |= (maskbit_list[i] & ~(maskbit_list[i]-1))
+ y |= maskbit_list[i]
# check the result
- outval = (yield module.eq_output)
- msg = f"{msg_prefix}: 0x{a:X} == 0x{b:X}" + \
+ outval = (yield getattr(module, "%s_output" % mod_attr))
+ msg = f"{msg_prefix}: {mod_attr} 0x{a:X} == 0x{b:X}" + \
f" => 0x{y:X} != 0x{outval:X}, masklist %s"
- #print ((msg % str(maskbit_list)).format(locals()))
+ print((msg % str(maskbit_list)).format(locals()))
self.assertEqual(y, outval, msg % str(maskbit_list))
- yield part_mask.eq(0)
- yield from test_eq("16-bit", 0b1111)
- yield part_mask.eq(0b10)
- yield from test_eq("8-bit", 0b1100, 0b0011)
- yield part_mask.eq(0b1111)
- yield from test_eq("4-bit", 0b1000, 0b0100, 0b0010, 0b0001)
- def test_gt(msg_prefix, *maskbit_list):
+ for (test_fn, mod_attr) in ((test_eq_fn, "eq"),
+ (test_gt_fn, "gt"),
+ (test_ge_fn, "ge"),
+ (test_lt_fn, "lt"),
+ (test_le_fn, "le"),
+ (test_ne_fn, "ne"),
+ ):
+ yield part_mask.eq(0)
+ yield from test_binop("16-bit", test_fn, mod_attr, 0b1111)
+ yield part_mask.eq(0b10)
+ yield from test_binop("8-bit", test_fn, mod_attr,
+ 0b1100, 0b0011)
+ yield part_mask.eq(0b1111)
+ yield from test_binop("4-bit", test_fn, mod_attr,
+ 0b1000, 0b0100, 0b0010, 0b0001)
+
+ def test_muxop(msg_prefix, *maskbit_list):
for a, b in [(0x0000, 0x0000),
(0x1234, 0x1234),
(0xABCD, 0xABCD),
(0x0000, 0x0000),
(0xFFFF, 0xFFFF),
(0x0000, 0xFFFF)]:
- yield module.a.eq(a)
- yield module.b.eq(b)
- yield Delay(0.1e-6)
# convert to mask_list
mask_list = []
for mb in maskbit_list:
v = 0
for i in range(4):
- if mb & (1<<i):
+ if mb & (1 << i):
v |= 0xf << (i*4)
mask_list.append(v)
- y = 0
- # do the partitioned tests
- for i, mask in enumerate(mask_list):
- if (a & mask) > (b & mask):
- # OR y with the lowest set bit in the mask
- y |= (maskbit_list[i] & ~(maskbit_list[i]-1))
- # check the result
- outval = (yield module.eq_output)
- msg = f"{msg_prefix}: 0x{a:X} == 0x{b:X}" + \
- f" => 0x{y:X} != 0x{outval:X}, masklist %s"
- #print ((msg % str(maskbit_list)).format(locals()))
- self.assertEqual(y, outval, msg % str(maskbit_list))
+
+ # TODO: sel needs to go through permutations of mask_list
+ for p in perms(len(mask_list)):
+
+ sel = 0
+ selmask = 0
+ for i, v in enumerate(p):
+ if v == '1':
+ sel |= maskbit_list[i]
+ selmask |= mask_list[i]
+
+ yield module.a.eq(a)
+ yield module.b.eq(b)
+ yield module.mux_sel.eq(sel)
+ yield Delay(0.1e-6)
+ y = 0
+ # do the partitioned tests
+ for i, mask in enumerate(mask_list):
+ if (selmask & mask):
+ y |= (a & mask)
+ else:
+ y |= (b & mask)
+ # check the result
+ outval = (yield module.mux_out)
+ msg = f"{msg_prefix}: mux " + \
+ f"0x{sel:X} ? 0x{a:X} : 0x{b:X}" + \
+ f" => 0x{y:X} != 0x{outval:X}, masklist %s"
+ # print ((msg % str(maskbit_list)).format(locals()))
+ self.assertEqual(y, outval, msg % str(maskbit_list))
+
yield part_mask.eq(0)
- yield from test_eq("16-bit", 0b1111)
+ yield from test_muxop("16-bit", 0b1111)
yield part_mask.eq(0b10)
- yield from test_eq("8-bit", 0b1100, 0b0011)
+ yield from test_muxop("8-bit", 0b1100, 0b0011)
yield part_mask.eq(0b1111)
- yield from test_eq("4-bit", 0b1000, 0b0100, 0b0010, 0b0001)
+ yield from test_muxop("4-bit", 0b1000, 0b0100, 0b0010, 0b0001)
sim.add_process(async_process)
- sim.run()
+ with sim.write_vcd(
+ vcd_file=open(test_name + ".vcd", "w"),
+ gtkw_file=open(test_name + ".gtkw", "w"),
+ traces=traces):
+ sim.run()
+
if __name__ == '__main__':
unittest.main()
-
projects / ieee754fpu.git / blobdiff