CRInSel, CROutSel,
LdstLen, In1Sel, In2Sel, In3Sel,
OutSel, SPRfull, SPRreduced,
- RC, SVP64LDSTmode, LDSTMode,
- SVEXTRA, SVEtype, SVPtype)
+ RCOE, SVP64LDSTmode, LDSTMode,
+ SVEXTRA, SVEType, SVPType)
from openpower.decoder.decode2execute1 import (Decode2ToExecute1Type, Data,
Decode2ToOperand)
comb += reg.data.eq(frs)
comb += reg.ok.eq(1)
+ # select Register FRT field,
+ frt = Signal(5, reset_less=True)
+ comb += frt.eq(self.dec.FRT)
+ with m.If(self.sel_in == In1Sel.FRT):
+ comb += reg.data.eq(frt)
+ comb += reg.ok.eq(1)
+
# decode Fast-SPR based on instruction type
with m.Switch(op.internal_op):
with m.Case(In2Sel.CONST_SH32): # unsigned - for shift
comb += self.imm_out.data.eq(self.dec.SH32)
comb += self.imm_out.ok.eq(1)
- with m.Case(In2Sel.CONST_XBI): # unsigned - for grevi
- comb += self.imm_out.data.eq(self.dec.FormXB.XBI)
- comb += self.imm_out.ok.eq(1)
return m
with m.Case(In3Sel.FRS):
comb += reg.data.eq(self.dec.FRS)
comb += reg.ok.eq(1)
+ with m.Case(In3Sel.FRA):
+ comb += reg.data.eq(self.dec.FRA)
+ comb += reg.ok.eq(1)
with m.Case(In3Sel.FRC):
comb += reg.data.eq(self.dec.FRC)
comb += reg.ok.eq(1)
class DecodeOut(Elaboratable):
"""DecodeOut from instruction
- decodes output register RA, RT or SPR
+ decodes output register RA, RT, FRS, FRT, or SPR
"""
def __init__(self, dec, op, regreduce_en):
# select Register out field
with m.Switch(self.sel_in):
+ with m.Case(OutSel.FRS):
+ comb += reg.data.eq(self.dec.FRS)
+ comb += reg.ok.eq(1)
+ with m.Case(OutSel.FRA):
+ comb += reg.data.eq(self.dec.FRA)
+ comb += reg.ok.eq(1)
with m.Case(OutSel.FRT):
comb += reg.data.eq(self.dec.FRT)
comb += reg.ok.eq(1)
self.dec = dec
self.op = op
self.sel_in = Signal(OutSel, reset_less=True)
- self.svp64_fft_mode = Signal(reset_less=True) # SVP64 FFT mode
+ self.implicit_rs = Signal(reset_less=True) # SVP64 implicit RS/FRS
+ self.implicit_from_rc = Signal(reset_less=True)# implicit RS from RC
self.lk = Signal(reset_less=True)
self.insn_in = Signal(32, reset_less=True)
self.reg_out = Data(5, "reg_o2")
- self.fp_madd_en = Signal(reset_less=True) # FFT instruction detected
+ self.rs_en = Signal(reset_less=True) # FFT instruction detected
self.fast_out = Data(4, "fast_o2")
self.fast_out3 = Data(4, "fast_o3")
# SVP64 FFT mode, FP mul-add: 2nd output reg (FRS) same as FRT
# will be offset by VL in hardware
# with m.Case(MicrOp.OP_FP_MADD):
- with m.If(self.svp64_fft_mode):
- comb += self.reg_out.data.eq(self.dec.FRT)
+ with m.If(self.implicit_rs):
+ with m.If(self.implicit_from_rc):
+ comb += self.reg_out.data.eq(self.dec.FRC) # same as RC
+ with m.Else():
+ comb += self.reg_out.data.eq(self.dec.FRT) # same as RT
comb += self.reg_out.ok.eq(1)
- comb += self.fp_madd_en.eq(1)
+ comb += self.rs_en.eq(1)
return m
def __init__(self, dec):
self.dec = dec
- self.sel_in = Signal(RC, reset_less=True)
+ self.sel_in = Signal(RCOE, reset_less=True)
self.insn_in = Signal(32, reset_less=True)
self.rc_out = Data(1, "rc")
# select Record bit out field
with m.Switch(self.sel_in):
- with m.Case(RC.RC):
+ with m.Case(RCOE.RC, RCOE.RC_ONLY):
comb += self.rc_out.data.eq(self.dec.Rc)
comb += self.rc_out.ok.eq(1)
- with m.Case(RC.ONE):
+ with m.Case(RCOE.ONE):
comb += self.rc_out.data.eq(1)
comb += self.rc_out.ok.eq(1)
- with m.Case(RC.NONE):
+ with m.Case(RCOE.NONE):
comb += self.rc_out.data.eq(0)
comb += self.rc_out.ok.eq(1)
class DecodeOE(Elaboratable):
"""DecodeOE from instruction
- decodes OE field: uses RC decode detection which might not be good
-
- -- For now, use "rc" in the decode table to decide whether oe exists.
- -- This is not entirely correct architecturally: For mulhd and
- -- mulhdu, the OE field is reserved. It remains to be seen what an
- -- actual POWER9 does if we set it on those instructions, for now we
- -- test that further down when assigning to the multiplier oe input.
+ decodes OE field: uses RC decode detection which has now been
+ updated to separate out RC_ONLY. all cases RC_ONLY are *NOT*
+ listening to the OE field, here.
"""
def __init__(self, dec, op):
self.dec = dec
self.op = op
- self.sel_in = Signal(RC, reset_less=True)
+ self.sel_in = Signal(RCOE, reset_less=True)
self.insn_in = Signal(32, reset_less=True)
self.oe_out = Data(1, "oe")
def elaborate(self, platform):
m = Module()
comb = m.d.comb
- op = self.op
-
- with m.Switch(op.internal_op):
- # mulhw, mulhwu, mulhd, mulhdu - these *ignore* OE
- # also rotate
- # XXX ARGH! ignoring OE causes incompatibility with microwatt
- # http://lists.libre-soc.org/pipermail/libre-soc-dev/2020-August/000302.html
- with m.Case(MicrOp.OP_MUL_H64, MicrOp.OP_MUL_H32,
- MicrOp.OP_EXTS, MicrOp.OP_CNTZ,
- MicrOp.OP_SHL, MicrOp.OP_SHR, MicrOp.OP_RLC,
- MicrOp.OP_LOAD, MicrOp.OP_STORE,
- MicrOp.OP_RLCL, MicrOp.OP_RLCR,
- MicrOp.OP_EXTSWSLI, MicrOp.OP_GREV):
- pass
-
- # all other ops decode OE field
+ with m.Switch(self.sel_in):
+ with m.Case(RCOE.RC):
+ comb += self.oe_out.data.eq(self.dec.OE)
+ comb += self.oe_out.ok.eq(1)
with m.Default():
- # select OE bit out field
- with m.Switch(self.sel_in):
- with m.Case(RC.RC):
- comb += self.oe_out.data.eq(self.dec.OE)
- comb += self.oe_out.ok.eq(1)
+ # default: clear OE.
+ comb += self.oe_out.data.eq(0)
+ comb += self.oe_out.ok.eq(0)
return m
self.cr_bitfield = Data(3, "cr_bitfield")
self.whole_reg = Data(8, "cr_fxm")
self.sv_override = Signal(2, reset_less=True) # do not do EXTRA spec
+ self.cr_5bit = Signal(reset_less=True) # set True for 5-bit
+ self.cr_2bit = Signal(2, reset_less=True) # get lowest 2 bits
def elaborate(self, platform):
m = Module()
comb += self.cr_bitfield.ok.eq(0)
comb += self.whole_reg.ok.eq(0)
comb += self.sv_override.eq(0)
+ comb += self.cr_5bit.eq(0)
# please note these MUST match (setting of cr_bitfield.ok) exactly
# with write_cr0 below in PowerDecoder2. the reason it's separated
with m.Case(CROutSel.BT):
comb += self.cr_bitfield.data.eq(self.dec.FormXL.BT[2:5])
comb += self.cr_bitfield.ok.eq(1)
+ comb += self.cr_5bit.eq(1)
+ comb += self.cr_2bit.eq(self.dec.FormXL.BT[0:2])
with m.Case(CROutSel.WHOLE_REG):
comb += self.whole_reg.ok.eq(1)
move_one = Signal(reset_less=True)
record_names = {'insn_type': 'internal_op',
'fn_unit': 'function_unit',
'SV_Ptype': 'SV_Ptype',
+ 'SV_mode': 'SV_mode',
'rc': 'rc_sel',
'oe': 'rc_sel',
'zero_a': 'in1_sel',
"""
def __init__(self, dec, opkls=None, fn_name=None, final=False, state=None,
- svp64_en=True, regreduce_en=False):
+ svp64_en=True, regreduce_en=False, fp_en=False):
self.svp64_en = svp64_en
self.regreduce_en = regreduce_en
+ self.fp_en = fp_en
if svp64_en:
self.is_svp64_mode = Signal() # mark decoding as SVP64 Mode
- self.use_svp64_ldst_dec = Signal() # must use LDST decoder
- self.use_svp64_fft = Signal() # FFT Mode
+ self.implicit_rs = Signal() # implicit RS/FRS
+ self.extend_rb_maxvl = Signal() # jumps RB by an additional MAXVL
+ self.extend_rc_maxvl = Signal() # jumps RS by MAXVL from RC
self.sv_rm = SVP64Rec(name="dec_svp64") # SVP64 RM field
self.rm_dec = SVP64RMModeDecode("svp64_rm_dec")
# set these to the predicate mask bits needed for the ALU
# alternatives. useful for PCR (Program Compatibility Register)
# amongst other things
if svp64_en:
- conditions = {'SVP64BREV': self.use_svp64_ldst_dec,
- 'SVP64FFT': self.use_svp64_fft,
+ conditions = {
+ # XXX NO 'SVP64FFT': self.use_svp64_fft,
}
else:
conditions = None
if dec is None:
dec = create_pdecode(name=fn_name, col_subset=col_subset,
row_subset=row_subset,
- conditions=conditions)
+ conditions=conditions, include_fp=fp_en)
self.dec = dec
# set up a copy of the PowerOp
# to support multiple tasks (unit column multiple entries)
# see https://bugs.libre-soc.org/show_bug.cgi?id=310
(self.fn_name == 'MMU' and row['unit'] == 'SPR' and
+ row['internal op'] in ['OP_MTSPR', 'OP_MFSPR']) or
+ # urrr... and the KAIVB SPR, which must also be redirected
+ # (to the TRAP pipeline)
+ # see https://bugs.libre-soc.org/show_bug.cgi?id=859
+ (self.fn_name == 'TRAP' and row['unit'] == 'SPR' and
row['internal op'] in ['OP_MTSPR', 'OP_MFSPR'])
)
if self.svp64_en:
ports += self.sv_rm.ports()
ports.append(self.is_svp64_mode)
- ports.append(self.use_svp64_ldst_dec)
- ports.append(self.use_svp64_fft)
+ ports.append(self.implicit_rs)
return ports
def needs_field(self, field, op_field):
# Microwatt doesn't implement the partition table
# instead has PRTBL register (SPR) to point to process table
+ # Kestrel has a KAIVB SPR to "rebase" exceptions. rebasing is normally
+ # done with Hypervisor Mode which is not implemented (yet)
is_spr_mv = Signal()
is_mmu_spr = Signal()
+ is_trap_spr = Signal()
comb += is_spr_mv.eq((internal_op == MicrOp.OP_MTSPR) |
(internal_op == MicrOp.OP_MFSPR))
comb += is_mmu_spr.eq((spr == SPR.DSISR.value) |
(spr == SPR.DAR.value) |
(spr == SPR.PRTBL.value) |
(spr == SPR.PIDR.value))
+ comb += is_trap_spr.eq((spr == SPR.KAIVB.value)
+ )
# MMU must receive MMU SPRs
with m.If(is_spr_mv & (fn == Function.SPR) & is_mmu_spr):
comb += self.do_copy("fn_unit", Function.MMU)
comb += self.do_copy("insn_type", internal_op)
- # SPR pipe must *not* receive MMU SPRs
- with m.Elif(is_spr_mv & (fn == Function.MMU) & ~is_mmu_spr):
+ # TRAP must receive TRAP SPR KAIVB
+ with m.If(is_spr_mv & (fn == Function.SPR) & is_trap_spr):
+ comb += self.do_copy("fn_unit", Function.TRAP)
+ comb += self.do_copy("insn_type", internal_op)
+ # SPR pipe must *not* receive MMU or TRAP SPRs
+ with m.Elif(is_spr_mv & ((fn == Function.MMU) & ~is_mmu_spr) &
+ ((fn == Function.TRAP) & ~is_trap_spr)):
comb += self.do_copy("fn_unit", Function.NONE)
comb += self.do_copy("insn_type", MicrOp.OP_ILLEGAL)
# all others ok
comb += dec_bi.sel_in.eq(self.op_get("in2_sel"))
comb += self.do_copy("imm_data", dec_bi.imm_out) # imm in RB
- # rc and oe out
- comb += self.do_copy("rc", dec_rc.rc_out)
- if self.svp64_en:
- # OE only enabled when SVP64 not active
- with m.If(~self.is_svp64_mode):
- comb += self.do_copy("oe", dec_oe.oe_out)
- else:
- comb += self.do_copy("oe", dec_oe.oe_out)
-
# CR in/out - note: these MUST match with what happens in
# DecodeCROut!
rc_out = self.dec_rc.rc_out.data
# quickly determined, and the Decoder result MUXed over to
# the alternative decoder, svdecldst. what a mess... *sigh*
sv_ptype = self.op_get("SV_Ptype")
+ sv_mode = self.op_get("SV_mode")
fn = self.op_get("function_unit")
- # detect major opcode for LDs: include 58 here. from CSV files.
- # BLECH! TODO: these should be done using "mini decoders",
- # using row and column subsets
- is_major_ld = Signal()
- # bits... errr... MSB0 0..5 which is 26:32 python
- major = Signal(6)
- comb += major.eq(self.dec.opcode_in[26:32])
- comb += is_major_ld.eq((major == 34) | (major == 35) |
- (major == 50) | (major == 51) |
- (major == 48) | (major == 49) |
- (major == 42) | (major == 43) |
- (major == 40) | (major == 41) |
- (major == 32) | (major == 33) |
- (major == 58))
- with m.If(self.is_svp64_mode & is_major_ld):
- # straight-up: "it's a LD". this gives enough info
- # for SVP64 RM Mode decoding to detect LD/ST, and
- # consequently detect the SHIFT mode. sigh
- comb += rm_dec.fn_in.eq(Function.LDST)
- with m.Else():
- comb += rm_dec.fn_in.eq(fn) # decode needs to know Fn type
+ comb += rm_dec.sv_mode.eq(sv_mode) # BRANCH/CROP/LDST_IMM etc.
+ comb += rm_dec.fn_in.eq(fn) # decode needs to know Fn type
comb += rm_dec.ptype_in.eq(sv_ptype) # Single/Twin predicated
comb += rm_dec.rc_in.eq(rc_out) # Rc=1
comb += rm_dec.rm_in.eq(self.sv_rm) # SVP64 RM mode
comb += rm_dec.ldst_imz_in.eq(bzero) # B immediate is zero
# main PowerDecoder2 determines if different SVP64 modes enabled
- if not self.final:
- # if shift mode requested
- shiftmode = rm_dec.ldstmode == SVP64LDSTmode.SHIFT
- comb += self.use_svp64_ldst_dec.eq(shiftmode)
# detect if SVP64 FFT mode enabled (really bad hack),
# exclude fcfids and others
# XXX this is a REALLY bad hack, REALLY has to be done better.
# likely with a sub-decoder.
- xo5 = Signal(1) # 1 bit from Minor 59 XO field == 0b0XXXX
- comb += xo5.eq(self.dec.opcode_in[5])
- xo = Signal(5) # 5 bits from Minor 59 fcfids == 0b01110
- comb += xo.eq(self.dec.opcode_in[1:6])
- comb += self.use_svp64_fft.eq((major == 59) & (xo5 == 0b0) &
- (xo != 0b01110))
+ # what this ultimately does is enable the 2nd implicit register
+ # (FRS) for SVP64-decoding. all of these instructions are
+ # 3-in 2-out but there is not enough room either in the
+ # opcode *or* EXTRA2/3 to specify a 5th operand.
+ major = Signal(6)
+ comb += major.eq(self.dec.opcode_in[26:32])
+ xo = Signal(10)
+ comb += xo.eq(self.dec.opcode_in[1:11])
+ comb += self.implicit_rs.eq(0)
+ comb += self.extend_rb_maxvl.eq(0)
+ comb += self.extend_rc_maxvl.eq(0)
+ # implicit RS for major 59
+ with m.If((major == 59) & xo.matches(
+ '-----00100', # ffmsubs
+ '-----00101', # ffmadds
+ '-----00110', # ffnmsubs
+ '-----00111', # ffnmadds
+ '1111100000', # ffadds
+ '-----11011', # fdmadds
+ )):
+ comb += self.implicit_rs.eq(1)
+ comb += self.extend_rb_maxvl.eq(1) # extend RB
+ xo6 = Signal(6)
+ comb += xo6.eq(self.dec.opcode_in[0:6])
+ # implicit RS for major 4
+ with m.If((major == 4) & xo6.matches(
+ '111000', # pcdec
+ '110010', # maddedu
+ '111001', # maddedus
+ '111010', # divmod2du
+ '11010-', # dsld
+ '11011-', # dsrd
+ )):
+ comb += self.implicit_rs.eq(1)
+ comb += self.extend_rc_maxvl.eq(1) # RS=RT+MAXVL or RS=RC
+ # implicit RS for major 22, integer maddsubrs
+ with m.If((major == 22) & xo6.matches(
+ '-01000', # maddsubrs
+ '-01001', # maddrs
+ '-01011', # msubrs
+ )):
+ comb += self.implicit_rs.eq(1)
+ comb += self.extend_rb_maxvl.eq(1) # extend RB
+
+ # rc and oe out
+ comb += self.do_copy("rc", dec_rc.rc_out)
+ if self.svp64_en:
+ # OE only enabled when SVP64 not active
+ with m.If(~self.is_svp64_mode):
+ comb += self.do_copy("oe", dec_oe.oe_out)
+ # RC1 overrides Rc if rc type is NONE or ONE or Rc=0, in svp64_mode
+ # for instructions with a forced-Rc=1 (stbcx., pcdec.)
+ # the RC1 RM bit *becomes* Rc=0/1, but for instructions
+ # that have Rc=0/1 then when Rc=0 RC1 *becomes* (replaces) Rc.
+ with m.Elif((dec_rc.sel_in.matches(RCOE.RC, RCOE.RC_ONLY) &
+ dec_rc.rc_out.data == 0) |
+ (dec_rc.sel_in == RCOE.ONE)):
+ RC1 = Data(1, "RC1")
+ comb += RC1.ok.eq(rm_dec.RC1)
+ comb += RC1.RC1.eq(rm_dec.RC1)
+ comb += self.do_copy("rc", RC1)
+ else:
+ comb += self.do_copy("oe", dec_oe.oe_out)
# decoded/selected instruction flags
comb += self.do_copy("data_len", self.op_get("ldst_len"))
"""
def __init__(self, dec, opkls=None, fn_name=None, final=False,
- state=None, svp64_en=True, regreduce_en=False):
+ state=None, svp64_en=True, regreduce_en=False, fp_en=False):
super().__init__(dec, opkls, fn_name, final, state, svp64_en,
- regreduce_en=False)
+ regreduce_en=False, fp_en=fp_en)
self.ldst_exc = LDSTException("dec2_exc") # rewrites as OP_TRAP
self.instr_fault = Signal() # rewrites instruction as OP_FETCH_FAILED
+ self.crout_5bit = Signal() # CR out is 5-bit
if self.svp64_en:
self.cr_out_isvec = Signal(1, name="cr_out_isvec")
subset.add("sv_cr_out")
subset.add("SV_Etype")
subset.add("SV_Ptype")
+ subset.add("SV_mode")
# from SVP64RMModeDecode
for (field, _) in sv_input_record_layout:
subset.add(field)
m.submodules.dec_cr_in = self.dec_cr_in = DecodeCRIn(self.dec, op)
m.submodules.dec_cr_out = self.dec_cr_out = DecodeCROut(self.dec, op)
comb += dec_a.sv_nz.eq(self.sv_a_nz)
+ comb += self.crout_5bit.eq(self.dec_cr_out.cr_5bit)
if self.svp64_en:
# and SVP64 Extra decoders
comb += dec_o.sel_in.eq(self.op_get("out_sel"))
comb += dec_o2.sel_in.eq(self.op_get("out_sel"))
if self.svp64_en:
- comb += dec_o2.svp64_fft_mode.eq(self.use_svp64_fft)
+ comb += dec_o2.implicit_rs.eq(self.implicit_rs)
+ comb += dec_o2.implicit_from_rc.eq(self.extend_rc_maxvl)
if hasattr(do, "lk"):
comb += dec_o2.lk.eq(do.lk)
# get SVSTATE srcstep (TODO: elwidth etc.) needed below
vl = Signal.like(self.state.svstate.vl)
+ maxvl = Signal.like(self.state.svstate.maxvl)
+ subvl = Signal.like(self.rm_dec.rm_in.subvl)
srcstep = Signal.like(self.state.svstate.srcstep)
dststep = Signal.like(self.state.svstate.dststep)
+ ssubstep = Signal.like(self.state.svstate.ssubstep)
+ dsubstep = Signal.like(self.state.svstate.ssubstep)
comb += vl.eq(self.state.svstate.vl)
+ comb += maxvl.eq(self.state.svstate.maxvl)
+ comb += subvl.eq(self.rm_dec.rm_in.subvl)
comb += srcstep.eq(self.state.svstate.srcstep)
comb += dststep.eq(self.state.svstate.dststep)
+ comb += ssubstep.eq(self.state.svstate.ssubstep)
+ comb += dsubstep.eq(self.state.svstate.dsubstep)
in1_step, in2_step = self.in1_step, self.in2_step
in3_step = self.in3_step
o_step, o2_step = self.o_step, self.o2_step
+ # multiply vl by subvl - note that this is only 7 bit!
+ # when elwidth overrides get involved this will have to go up
+ vmax = Signal(7)
+ comb += vmax.eq(vl*(subvl+1))
+
# registers a, b, c and out and out2 (LD/ST EA)
sv_etype = self.op_get("SV_Etype")
for i, stuff in enumerate((
("RB", e.read_reg2, dec_b.reg_out, in2_svdec, in2_step, False),
("RC", e.read_reg3, dec_c.reg_out, in3_svdec, in3_step, False),
("RT", e.write_reg, dec_o.reg_out, o_svdec, o_step, True),
- ("EA", e.write_ea, dec_o2.reg_out, o2_svdec, o2_step, True))):
+ ("EA", e.write_ea, dec_o2.reg_out, o2_svdec, o2_step, True))):
rname, to_reg, fromreg, svdec, remapstep, out = stuff
comb += svdec.extra.eq(extra) # EXTRA field of SVP64 RM
comb += svdec.etype.eq(sv_etype) # EXTRA2/3 for this insn
# automagically add on an extra offset to RB.
# however when REMAP is active, the FFT REMAP
# schedule takes care of this offset.
- with m.If(dec_o2.reg_out.ok & dec_o2.fp_madd_en):
+ with m.If(dec_o2.reg_out.ok & dec_o2.rs_en &
+ self.extend_rb_maxvl):
with m.If(~self.remap_active[i]):
with m.If(svdec.isvec):
- comb += offs.eq(vl) # VL for Vectors
+ comb += offs.eq(maxvl) # MAXVL for Vectors
# detect if Vectorised: add srcstep/dststep if yes.
# to_reg is 7-bits, outs get dststep added, ins get srcstep
with m.If(svdec.isvec):
selectstep = dststep if out else srcstep
+ subselect = dsubstep if out else ssubstep
step = Signal(7, name="step_%s" % rname.lower())
with m.If(self.remap_active[i]):
- comb += step.eq(remapstep)
+ comb += step.eq((remapstep*(subvl+1))+subselect)
with m.Else():
- comb += step.eq(selectstep)
+ comb += step.eq((selectstep*(subvl+1))+subselect)
# reverse gear goes the opposite way
with m.If(self.rm_dec.reverse_gear):
- comb += to_reg.data.eq(offs+svdec.reg_out+(vl-1-step))
+ comb += to_reg.offs.eq(offs+(vmax-1-step))
with m.Else():
- comb += to_reg.data.eq(offs+step+svdec.reg_out)
+ comb += to_reg.offs.eq(offs+step)
with m.Else():
- comb += to_reg.data.eq(offs+svdec.reg_out)
+ comb += to_reg.offs.eq(offs)
+ comb += to_reg.base.eq(svdec.reg_out)
+ comb += to_reg.data.eq(to_reg.base + to_reg.offs)
# SVP64 in/out fields
comb += in1_svdec.idx.eq(self.op_get("sv_in1")) # reg #1 (in1_sel)
comb += self.o2_isvec.eq(o2_svdec.isvec)
# urrr... don't ask... the implicit register FRS in FFT mode
- # "tracks" FRT exactly except it's offset by VL. rather than
+ # "tracks" FRT exactly except it's offset by MAXVL. rather than
# mess up the above with if-statements, override it here.
- # same trick is applied to FRA, above, but it's a lot cleaner, there
- with m.If(dec_o2.reg_out.ok & dec_o2.fp_madd_en):
+ # same trick is applied to FRB, above, but it's a lot cleaner there
+ with m.If(dec_o2.reg_out.ok & dec_o2.rs_en):
+ imp_reg_out = Signal(7)
+ imp_isvec = Signal(1)
+ with m.If(self.extend_rc_maxvl): # maddedu etc. from RC
+ comb += imp_isvec.eq(in3_svdec.isvec)
+ comb += imp_reg_out.eq(in3_svdec.reg_out)
+ with m.Else():
+ comb += imp_isvec.eq(o_svdec.isvec)
+ comb += imp_reg_out.eq(o_svdec.reg_out)
comb += offs.eq(0)
with m.If(~self.remap_active[4]):
- with m.If(o2_svdec.isvec):
- comb += offs.eq(vl) # VL for Vectors
+ with m.If(imp_isvec):
+ comb += offs.eq(maxvl) # MAXVL for Vectors
+ with m.Elif(self.extend_rc_maxvl): # maddedu etc. from RC
+ comb += offs.eq(0) # keep as RC
with m.Else():
comb += offs.eq(1) # add 1 if scalar
- svdec = o_svdec # yes take source as o_svdec...
- with m.If(svdec.isvec):
+ with m.If(imp_isvec):
step = Signal(7, name="step_%s" % rname.lower())
with m.If(self.remap_active[4]):
- comb += step.eq(o2_step)
+ with m.If(self.extend_rc_maxvl): # maddedu etc. from RC
+ comb += step.eq(in3_step)
+ with m.Else():
+ comb += step.eq(o2_step)
with m.Else():
comb += step.eq(dststep)
# reverse gear goes the opposite way
with m.If(self.rm_dec.reverse_gear):
roffs = offs+(vl-1-step)
- comb += to_reg.data.eq(roffs+svdec.reg_out)
+ comb += e.write_ea.data.eq(roffs)
with m.Else():
- comb += to_reg.data.eq(offs+step+svdec.reg_out)
+ comb += e.write_ea.data.eq(offs+step)
with m.Else():
- comb += to_reg.data.eq(offs+svdec.reg_out)
+ comb += e.write_ea.offs.eq(offs)
+ comb += e.write_ea.base.eq(imp_reg_out)
+ comb += e.write_ea.data.eq(e.write_ea.base + e.write_ea.offs)
# ... but write to *second* output
- comb += self.o2_isvec.eq(svdec.isvec)
+ comb += self.o2_isvec.eq(imp_isvec)
comb += o2_svdec.idx.eq(self.op_get("sv_out"))
# TODO add SPRs here. must be True when *all* are scalar
# should continue. this doesn't include predication bit-tests
loop = self.loop_continue
with m.Switch(self.op_get("SV_Ptype")):
- with m.Case(SVPtype.P2.value):
+ with m.Case(SVPType.P2.value):
# twin-predication
# TODO: *and cache-inhibited LD/ST!*
comb += loop.eq(~(self.no_in_vec | self.no_out_vec))
- with m.Case(SVPtype.P1.value):
+ with m.Case(SVPType.P1.value):
# single-predication, test relies on dest only
comb += loop.eq(~self.no_out_vec)
with m.Default():
(e.read_cr1, self.dec_cr_in, "cr_bitfield", crin_svdec, 0),
(e.read_cr2, self.dec_cr_in, "cr_bitfield_b", crin_svdec_b, 0),
(e.read_cr3, self.dec_cr_in, "cr_bitfield_o", crin_svdec_o, 0),
- (e.write_cr, self.dec_cr_out, "cr_bitfield", crout_svdec, 1)):
+ (e.write_cr, self.dec_cr_out, "cr_bitfield", crout_svdec, 1)):
fromreg = getattr(cr, name)
comb += svdec.extra.eq(extra) # EXTRA field of SVP64 RM
comb += svdec.etype.eq(sv_etype) # EXTRA2/3 for this insn
if self.svp64_en:
comb += self.rm_dec.ldst_ra_vec.eq(self.in1_isvec) # RA is vector
+ comb += self.rm_dec.cr_5bit_in.eq(self.crout_5bit) # CR is 5-bit
+ # take bottom 2 bits of CR out (CR field selector)
+ with m.If(self.crout_5bit):
+ comb += self.rm_dec.cr_2bit_in.eq(self.dec_cr_out.cr_2bit)
# SPRs out
comb += e.read_spr1.eq(dec_a.spr_out)
# Note: OP_SC could actually be modified to just be a trap
with m.If((do_out.insn_type == MicrOp.OP_TRAP) |
(do_out.insn_type == MicrOp.OP_SC)):
- # see fu/trap/main_stage.py trap() function: some bits of SRR1
- # need to be preserved, rather than just blithely overwrite MSR.
- # following microwatt, here.
- # TRAP read fast2 = SRR1
- comb += e_out.read_fast2.data.eq(FastRegsEnum.SRR1) # SRR1
- comb += e_out.read_fast2.ok.eq(1)
# TRAP write fast1 = SRR0
comb += e_out.write_fast1.data.eq(FastRegsEnum.SRR0) # SRR0
comb += e_out.write_fast1.ok.eq(1)
projects / openpower-isa.git / blobdiff