CRInSel, CROutSel,
LdstLen, In1Sel, In2Sel, In3Sel,
OutSel, SPRfull, SPRreduced,
- FLAGS, SVP64LDSTmode, LDSTMode,
+ RCOE, SVP64LDSTmode, LDSTMode,
SVEXTRA, SVEtype, SVPtype)
from openpower.decoder.decode2execute1 import (Decode2ToExecute1Type, Data,
Decode2ToOperand)
def __init__(self, dec):
self.dec = dec
- self.sel_in = Signal(FLAGS, 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(FLAGS.RC_OE, FLAGS.RC_ONLY):
+ 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(FLAGS.ONE):
+ with m.Case(RCOE.ONE):
comb += self.rc_out.data.eq(1)
comb += self.rc_out.ok.eq(1)
- with m.Case(FLAGS.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(FLAGS, 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
-
- # default: clear OE.
- comb += self.oe_out.data.eq(0)
- comb += self.oe_out.ok.eq(0)
- with m.Switch(op.internal_op):
-
- # mulhw, mulhwu, mulhd, mulhdu - these *ignore* OE
- # also rotate. and setvl and all other sv* management
- # basically the HDL below bypasses normal decode and
- # goes directly and explicitly to bit 30 (self.dec.OE).
- # on the list of instructions below (really this should
- # be in the CSV files) they must be told *not* to do that.
- # 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_SETVL, MicrOp.OP_SVSHAPE,
- MicrOp.OP_SVINDEX, MicrOp.OP_SVREMAP,
- MicrOp.OP_SVSTEP,
- MicrOp.OP_EXTSWSLI, MicrOp.OP_GREV, MicrOp.OP_TERNLOG):
- 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(FLAGS.RC_OE):
- 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