only fields actually requested are copied over. hence, "subset" (duh).
"""
- def __init__(self, dec, opkls=None, fn_name=None, final=False, state=None):
+ def __init__(self, dec, opkls=None, fn_name=None, final=False, state=None,
+ svp64_en=True):
- self.sv_rm = SVP64Rec(name="dec_svp64") # SVP64 RM field
+ self.svp64_en = svp64_en
+ if svp64_en:
+ self.sv_rm = SVP64Rec(name="dec_svp64") # SVP64 RM field
self.final = final
self.opkls = opkls
self.fn_name = fn_name
)
def ports(self):
- return self.dec.ports() + self.e.ports() + self.sv_rm.ports()
+ ports = self.dec.ports() + self.e.ports()
+ if self.svp64_en:
+ ports += self.sv_rm.ports()
+ return ports
def needs_field(self, field, op_field):
if self.final:
the output, into here (PowerDecoder2). without incrementing PC.
"""
- def __init__(self, dec, opkls=None, fn_name=None, final=False, state=None):
- super().__init__(dec, opkls, fn_name, final, state)
+ def __init__(self, dec, opkls=None, fn_name=None, final=False,
+ state=None, svp64_en=True):
+ super().__init__(dec, opkls, fn_name, final, state, svp64_en)
self.exc = LDSTException("dec2_exc")
self.cr_out_isvec = Signal(1, name="cr_out_isvec")
m.submodules.dec_cr_in = self.dec_cr_in = DecodeCRIn(self.dec)
m.submodules.dec_cr_out = self.dec_cr_out = DecodeCROut(self.dec)
- # and SVP64 Extra decoders
- m.submodules.crout_svdec = crout_svdec = SVP64CRExtra()
- m.submodules.crin_svdec = crin_svdec = SVP64CRExtra()
- m.submodules.crin_svdec_b = crin_svdec_b = SVP64CRExtra()
- m.submodules.crin_svdec_o = crin_svdec_o = SVP64CRExtra()
- m.submodules.in1_svdec = in1_svdec = SVP64RegExtra()
- m.submodules.in2_svdec = in2_svdec = SVP64RegExtra()
- m.submodules.in3_svdec = in3_svdec = SVP64RegExtra()
- m.submodules.o_svdec = o_svdec = SVP64RegExtra()
- m.submodules.o2_svdec = o2_svdec = SVP64RegExtra()
-
- # debug access to crout_svdec (used in get_pdecode_cr_out)
- self.crout_svdec = crout_svdec
+ if self.svp64_en:
+ # and SVP64 Extra decoders
+ m.submodules.crout_svdec = crout_svdec = SVP64CRExtra()
+ m.submodules.crin_svdec = crin_svdec = SVP64CRExtra()
+ m.submodules.crin_svdec_b = crin_svdec_b = SVP64CRExtra()
+ m.submodules.crin_svdec_o = crin_svdec_o = SVP64CRExtra()
+ m.submodules.in1_svdec = in1_svdec = SVP64RegExtra()
+ m.submodules.in2_svdec = in2_svdec = SVP64RegExtra()
+ m.submodules.in3_svdec = in3_svdec = SVP64RegExtra()
+ m.submodules.o_svdec = o_svdec = SVP64RegExtra()
+ m.submodules.o2_svdec = o2_svdec = SVP64RegExtra()
+
+ # debug access to crout_svdec (used in get_pdecode_cr_out)
+ self.crout_svdec = crout_svdec
# get the 5-bit reg data before svp64-munging it into 7-bit plus isvec
reg = Signal(5, reset_less=True)
comb += self.do_copy("read_cr_whole", self.dec_cr_in.whole_reg)
comb += self.do_copy("write_cr_whole", self.dec_cr_out.whole_reg)
- # now do the SVP64 munging. op.SV_Etype and op.sv_in1 comes from
- # PowerDecoder which in turn comes from LDST-RM*.csv and RM-*.csv
- # which in turn were auto-generated by sv_analysis.py
- extra = self.sv_rm.extra # SVP64 extra bits 10:18
-
- #######
- # CR out
- comb += crout_svdec.idx.eq(op.sv_cr_out) # SVP64 CR out
- comb += self.cr_out_isvec.eq(crout_svdec.isvec)
-
- #######
- # CR in - index selection slightly different due to shared CR field sigh
- cr_a_idx = Signal(SVEXTRA)
- cr_b_idx = Signal(SVEXTRA)
-
- # these change slightly, when decoding BA/BB. really should have
- # their own separate CSV column: sv_cr_in1 and sv_cr_in2, but hey
- comb += cr_a_idx.eq(op.sv_cr_in)
- comb += cr_b_idx.eq(SVEXTRA.NONE)
- with m.If(op.sv_cr_in == SVEXTRA.Idx_1_2.value):
- comb += cr_a_idx.eq(SVEXTRA.Idx1)
- comb += cr_b_idx.eq(SVEXTRA.Idx2)
-
- comb += self.cr_in_isvec.eq(crin_svdec.isvec)
- comb += self.cr_in_b_isvec.eq(crin_svdec_b.isvec)
- comb += self.cr_in_o_isvec.eq(crin_svdec_o.isvec)
-
- # indices are slightly different, BA/BB mess sorted above
- comb += crin_svdec.idx.eq(cr_a_idx) # SVP64 CR in A
- comb += crin_svdec_b.idx.eq(cr_b_idx) # SVP64 CR in B
- comb += crin_svdec_o.idx.eq(op.sv_cr_out) # SVP64 CR out
-
# ...and subdecoders' input fields
comb += dec_a.sel_in.eq(op.in1_sel)
comb += dec_b.sel_in.eq(op.in2_sel)
if hasattr(do, "lk"):
comb += dec_o2.lk.eq(do.lk)
- # get SVSTATE srcstep (TODO: elwidth, dststep etc.) needed below
- srcstep = Signal.like(self.state.svstate.srcstep)
- comb += srcstep.eq(self.state.svstate.srcstep)
-
- # registers a, b, c and out and out2 (LD/ST EA)
- for to_reg, fromreg, svdec in (
- (e.read_reg1, dec_a.reg_out, in1_svdec),
- (e.read_reg2, dec_b.reg_out, in2_svdec),
- (e.read_reg3, dec_c.reg_out, in3_svdec),
- (e.write_reg, dec_o.reg_out, o_svdec),
- (e.write_ea, dec_o2.reg_out, o2_svdec)):
- comb += svdec.extra.eq(extra) # EXTRA field of SVP64 RM
- comb += svdec.etype.eq(op.SV_Etype) # EXTRA2/3 for this insn
- comb += svdec.reg_in.eq(fromreg.data) # 3-bit (CR0/BC/BFA)
- comb += to_reg.ok.eq(fromreg.ok)
- # detect if Vectorised: add srcstep if yes. TODO: a LOT.
- # this trick only holds when elwidth=default and in single-pred
- with m.If(svdec.isvec):
- comb += to_reg.data.eq(srcstep+svdec.reg_out) # 7-bit output
- with m.Else():
- comb += to_reg.data.eq(svdec.reg_out) # 7-bit output
-
- comb += in1_svdec.idx.eq(op.sv_in1) # SVP64 reg #1 (matches in1_sel)
- comb += in2_svdec.idx.eq(op.sv_in2) # SVP64 reg #2 (matches in2_sel)
- comb += in3_svdec.idx.eq(op.sv_in3) # SVP64 reg #3 (matches in3_sel)
- comb += o_svdec.idx.eq(op.sv_out) # SVP64 output (matches out_sel)
- # XXX TODO - work out where this should come from. the problem is
- # that LD-with-update is implied (computed from "is instruction in
- # "update mode" rather than specified cleanly as its own CSV column
- #comb += o2_svdec.idx.eq(op.sv_out) # SVP64 output (implicit)
-
- # output reg-is-vectorised (and when no input or output is vectorised)
- comb += self.in1_isvec.eq(in1_svdec.isvec)
- comb += self.in2_isvec.eq(in2_svdec.isvec)
- comb += self.in3_isvec.eq(in3_svdec.isvec)
- comb += self.o_isvec.eq(o_svdec.isvec)
- comb += self.o2_isvec.eq(o2_svdec.isvec)
- # TODO add SPRs here. must be True when *all* are scalar
- l = map(lambda svdec: svdec.isvec, [in1_svdec, in2_svdec, in3_svdec,
- crin_svdec, crin_svdec_b, crin_svdec_o])
- comb += self.no_in_vec.eq(~Cat(*l).bool()) # all input scalar
- l = map(lambda svdec: svdec.isvec, [o2_svdec, o_svdec, crout_svdec])
- comb += self.no_out_vec.eq(~Cat(*l).bool()) # all output scalar
+ if self.svp64_en:
+ # now do the SVP64 munging. op.SV_Etype and op.sv_in1 comes from
+ # PowerDecoder which in turn comes from LDST-RM*.csv and RM-*.csv
+ # which in turn were auto-generated by sv_analysis.py
+ extra = self.sv_rm.extra # SVP64 extra bits 10:18
+
+ #######
+ # CR out
+ comb += crout_svdec.idx.eq(op.sv_cr_out) # SVP64 CR out
+ comb += self.cr_out_isvec.eq(crout_svdec.isvec)
+
+ #######
+ # CR in - selection slightly different due to shared CR field sigh
+ cr_a_idx = Signal(SVEXTRA)
+ cr_b_idx = Signal(SVEXTRA)
+
+ # these change slightly, when decoding BA/BB. really should have
+ # their own separate CSV column: sv_cr_in1 and sv_cr_in2, but hey
+ comb += cr_a_idx.eq(op.sv_cr_in)
+ comb += cr_b_idx.eq(SVEXTRA.NONE)
+ with m.If(op.sv_cr_in == SVEXTRA.Idx_1_2.value):
+ comb += cr_a_idx.eq(SVEXTRA.Idx1)
+ comb += cr_b_idx.eq(SVEXTRA.Idx2)
+
+ comb += self.cr_in_isvec.eq(crin_svdec.isvec)
+ comb += self.cr_in_b_isvec.eq(crin_svdec_b.isvec)
+ comb += self.cr_in_o_isvec.eq(crin_svdec_o.isvec)
+
+ # indices are slightly different, BA/BB mess sorted above
+ comb += crin_svdec.idx.eq(cr_a_idx) # SVP64 CR in A
+ comb += crin_svdec_b.idx.eq(cr_b_idx) # SVP64 CR in B
+ comb += crin_svdec_o.idx.eq(op.sv_cr_out) # SVP64 CR out
+
+ # get SVSTATE srcstep (TODO: elwidth, dststep etc.) needed below
+ srcstep = Signal.like(self.state.svstate.srcstep)
+ comb += srcstep.eq(self.state.svstate.srcstep)
+
+ # registers a, b, c and out and out2 (LD/ST EA)
+ for to_reg, fromreg, svdec in (
+ (e.read_reg1, dec_a.reg_out, in1_svdec),
+ (e.read_reg2, dec_b.reg_out, in2_svdec),
+ (e.read_reg3, dec_c.reg_out, in3_svdec),
+ (e.write_reg, dec_o.reg_out, o_svdec),
+ (e.write_ea, dec_o2.reg_out, o2_svdec)):
+ comb += svdec.extra.eq(extra) # EXTRA field of SVP64 RM
+ comb += svdec.etype.eq(op.SV_Etype) # EXTRA2/3 for this insn
+ comb += svdec.reg_in.eq(fromreg.data) # 3-bit (CR0/BC/BFA)
+ comb += to_reg.ok.eq(fromreg.ok)
+ # detect if Vectorised: add srcstep if yes. TODO: a LOT.
+ # this trick only holds when elwidth=default and in single-pred
+ with m.If(svdec.isvec):
+ comb += to_reg.data.eq(srcstep+svdec.reg_out) # 7-bit output
+ with m.Else():
+ comb += to_reg.data.eq(svdec.reg_out) # 7-bit output
+
+ comb += in1_svdec.idx.eq(op.sv_in1) # SVP64 reg #1 (in1_sel)
+ comb += in2_svdec.idx.eq(op.sv_in2) # SVP64 reg #2 (in2_sel)
+ comb += in3_svdec.idx.eq(op.sv_in3) # SVP64 reg #3 (in3_sel)
+ comb += o_svdec.idx.eq(op.sv_out) # SVP64 output (out_sel)
+ # XXX TODO - work out where this should come from. the problem is
+ # that LD-with-update is implied (computed from "is instruction in
+ # "update mode" rather than specified cleanly as its own CSV column
+ #comb += o2_svdec.idx.eq(op.sv_out) # SVP64 output (implicit)
+
+ # output reg-is-vectorised (and when no in/out is vectorised)
+ comb += self.in1_isvec.eq(in1_svdec.isvec)
+ comb += self.in2_isvec.eq(in2_svdec.isvec)
+ comb += self.in3_isvec.eq(in3_svdec.isvec)
+ comb += self.o_isvec.eq(o_svdec.isvec)
+ comb += self.o2_isvec.eq(o2_svdec.isvec)
+ # TODO add SPRs here. must be True when *all* are scalar
+ l = map(lambda svdec: svdec.isvec, [in1_svdec, in2_svdec, in3_svdec,
+ crin_svdec, crin_svdec_b, crin_svdec_o])
+ comb += self.no_in_vec.eq(~Cat(*l).bool()) # all input scalar
+ l = map(lambda svdec: svdec.isvec, [o2_svdec, o_svdec, crout_svdec])
+ comb += self.no_out_vec.eq(~Cat(*l).bool()) # all output scalar
+
+ # condition registers (CR)
+ for to_reg, cr, name, svdec in (
+ (e.read_cr1, self.dec_cr_in, "cr_bitfield", crin_svdec),
+ (e.read_cr2, self.dec_cr_in, "cr_bitfield_b", crin_svdec_b),
+ (e.read_cr3, self.dec_cr_in, "cr_bitfield_o", crin_svdec_o),
+ (e.write_cr, self.dec_cr_out, "cr_bitfield", crout_svdec)):
+ fromreg = getattr(cr, name)
+ comb += svdec.extra.eq(extra) # EXTRA field of SVP64 RM
+ comb += svdec.etype.eq(op.SV_Etype) # EXTRA2/3 for this insn
+ comb += svdec.cr_in.eq(fromreg.data) # 3-bit (CR0/BC/BFA)
+ with m.If(svdec.isvec):
+ # check if this is CR0 or CR1: treated differently
+ # (does not "listen" to EXTRA2/3 spec for a start)
+ # also: the CRs start from completely different locations
+ with m.If(cr.sv_override == 1): # CR0
+ offs = SVP64CROffs.CR0
+ comb += to_reg.data.eq(srcstep+offs)
+ with m.Elif(cr.sv_override == 2): # CR1
+ offs = SVP64CROffs.CR1
+ comb += to_reg.data.eq(srcstep+1)
+ with m.Else():
+ comb += to_reg.data.eq(srcstep+svdec.cr_out) # 7-bit out
+ with m.Else():
+ comb += to_reg.data.eq(svdec.cr_out) # 7-bit output
+ comb += to_reg.ok.eq(fromreg.ok)
+
+ else:
+ for to_reg, fromreg in (
+ (e.read_reg1, dec_a.reg_out),
+ (e.read_reg2, dec_b.reg_out),
+ (e.read_reg3, dec_c.reg_out),
+ (e.write_reg, dec_o.reg_out),
+ (e.write_ea, dec_o2.reg_out),
+ (e.read_cr1, self.dec_cr_in),
+ (e.read_cr2, self.dec_cr_in),
+ (e.read_cr3, self.dec_cr_in),
+ (e.write_cr, self.dec_cr_out )):
+ comb += to_reg.data.eq(fromreg.data)
+ comb += to_reg.ok.eq(fromreg.ok)
+
+ comb += self.no_in_vec.eq(1)
+ comb += self.no_out_vec.eq(1)
# SPRs out
comb += e.read_spr1.eq(dec_a.spr_out)
comb += e.write_fast1.eq(dec_o.fast_out)
comb += e.write_fast2.eq(dec_o2.fast_out)
- # condition registers (CR)
- for to_reg, cr, name, svdec in (
- (e.read_cr1, self.dec_cr_in, "cr_bitfield", crin_svdec),
- (e.read_cr2, self.dec_cr_in, "cr_bitfield_b", crin_svdec_b),
- (e.read_cr3, self.dec_cr_in, "cr_bitfield_o", crin_svdec_o),
- (e.write_cr, self.dec_cr_out, "cr_bitfield", crout_svdec)):
- fromreg = getattr(cr, name)
- comb += svdec.extra.eq(extra) # EXTRA field of SVP64 RM
- comb += svdec.etype.eq(op.SV_Etype) # EXTRA2/3 for this insn
- comb += svdec.cr_in.eq(fromreg.data) # 3-bit (CR0/BC/BFA)
- with m.If(svdec.isvec):
- # check if this is CR0 or CR1: treated differently
- # (does not "listen" to EXTRA2/3 spec for a start)
- # also: the CRs start from completely different locations
- with m.If(cr.sv_override == 1): # CR0
- offs = SVP64CROffs.CR0
- comb += to_reg.data.eq(srcstep+offs)
- with m.Elif(cr.sv_override == 2): # CR1
- offs = SVP64CROffs.CR1
- comb += to_reg.data.eq(srcstep+1)
- with m.Else():
- comb += to_reg.data.eq(srcstep+svdec.cr_out) # 7-bit output
- with m.Else():
- comb += to_reg.data.eq(svdec.cr_out) # 7-bit output
- comb += to_reg.ok.eq(fromreg.ok)
-
# sigh this is exactly the sort of thing for which the
# decoder is designed to not need. MTSPR, MFSPR and others need
# access to the XER bits. however setting e.oe is not appropriate
projects / soc.git / commitdiff