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67 lines
1.5 KiB
Python
67 lines
1.5 KiB
Python
3 years ago
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from amaranth import *
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from amaranth.asserts import *
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from .. import pfv
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__all__ = ["UniquenessCheck", "UniquenessCover"]
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class UniquenessCheck(Elaboratable):
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"""Uniqueness check.
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Check that the core cannot retire two instructions with the same `pfv.order` identifier.
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"""
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def __init__(self):
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self.pre = Signal()
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self.post = Signal()
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self.pfv = pfv.Interface()
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def elaborate(self, platform):
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m = Module()
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spec_order = AnyConst(self.pfv.order.shape())
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duplicate = Signal()
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with m.If(self.pre):
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m.d.sync += [
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Assume(self.pfv.stb),
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Assume(spec_order == self.pfv.order),
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Assume(~duplicate),
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]
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with m.Elif(self.pfv.stb & (self.pfv.order == spec_order)):
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m.d.sync += duplicate.eq(1)
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with m.If(self.post):
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m.d.sync += Assert(~duplicate)
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return m
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class UniquenessCover(Elaboratable):
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def __init__(self):
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self.pre = Signal()
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self.post = Signal()
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self.pfv = pfv.Interface()
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def elaborate(self, platform):
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m = Module()
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insn_count = Signal(range(4))
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with m.If(self.pfv.stb):
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m.d.sync += insn_count.eq(insn_count + 1)
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cover_1 = Signal()
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cover_2 = Signal()
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m.d.comb += [
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cover_1.eq(insn_count == 1),
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cover_2.eq(insn_count == 2),
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Cover(cover_1),
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Cover(cover_2),
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]
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return m
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