from nmigen.cli import main, verilog
from math import log
-from ieee754.fpcommon.modbase import FPModBase, FPModBaseChain
+from nmutil.pipemodbase import PipeModBase, PipeModBaseChain
from ieee754.fpcommon.fpbase import FPNumDecode
-from nmutil.singlepipe import StageChain
-from ieee754.pipeline import DynamicPipe
from ieee754.fpcommon.fpbase import FPNumBaseRecord
-from ieee754.fpcommon.getop import FPADDBaseData
+from ieee754.fpcommon.basedata import FPBaseData
from ieee754.fpcommon.denorm import (FPSCData, FPAddDeNormMod)
-class FPAddSpecialCasesMod(FPModBase):
+class FPAddSpecialCasesMod(PipeModBase):
""" special cases: NaNs, infs, zeros, denormalised
NOTE: some of these are unique to add. see "Special Operations"
https://steve.hollasch.net/cgindex/coding/ieeefloat.html
super().__init__(pspec, "specialcases")
def ispec(self):
- return FPADDBaseData(self.pspec)
+ return FPBaseData(self.pspec)
def ospec(self):
return FPSCData(self.pspec, True)
with m.If(abnan):
comb += self.o.z.nan(0)
- # XXX WEIRDNESS for FP16 non-canonical NaN handling
- # under review
-
- ## if a is zero and b is NaN return -b
- #with m.If(a.is_zero & (a.s==0) & b.is_nan):
- # comb += self.o.out_do_z.eq(1)
- # comb += z.create(b.s, b.e, Cat(b.m[3:-2], ~b.m[0]))
-
- ## if b is zero and a is NaN return -a
- #with m.Elif(b.is_zero & (b.s==0) & a.is_nan):
- # comb += self.o.out_do_z.eq(1)
- # comb += z.create(a.s, a.e, Cat(a.m[3:-2], ~a.m[0]))
-
- ## if a is -zero and b is NaN return -b
- #with m.Elif(a.is_zero & (a.s==1) & b.is_nan):
- # comb += self.o.out_do_z.eq(1)
- # comb += z.create(a.s & b.s, b.e, Cat(b.m[3:-2], 1))
-
- ## if b is -zero and a is NaN return -a
- #with m.Elif(b.is_zero & (b.s==1) & a.is_nan):
- # comb += self.o.out_do_z.eq(1)
- # comb += z.create(a.s & b.s, a.e, Cat(a.m[3:-2], 1))
-
# if a is inf return inf (or NaN)
with m.Elif(a1.is_inf):
comb += self.o.z.inf(a1.s)
return m
-class FPAddSpecialCasesDeNorm(FPModBaseChain):
+class FPAddSpecialCasesDeNorm(PipeModBaseChain):
""" special cases chain
"""