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spec: drop IsZero template #278

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Merged
erik-3milabs merged 1 commit into from
Feb 3, 2026
Merged

spec: drop IsZero template #278

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5 changes: 2 additions & 3 deletions spec/cpu.typ
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Original file line number Diff line number Diff line change
Expand Up @@ -76,9 +76,8 @@ including the appropriate sign/zero extension, depending on `word_instr`.
#render_constraint_table(chip, config, groups: "ext")

=== Other constraints

#rj[proper ref to IsZero/IsEqual]
For @cpu:c:is_equal, refer to the logic of IsZero or IsEqual, in combination with the subtraction of @cpu:c:sub.
For @cpu:c:is_equal, note that @cpu:c:sub sets `res` to be the difference between `arg1` and `arg2` whenever `BEQ` is $1$.
Given that this difference is $0$ when both are equal, @cpu:c:is_equal ensures `is_equal` is set to $1$ if and only if $#`arg1` = #`arg2`$ and `BEQ` is set.

#render_constraint_table(chip, config, groups: "misc")

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4 changes: 2 additions & 2 deletions spec/src/shift.toml
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Expand Up @@ -198,8 +198,8 @@ ref = "shift:c:bit_shift_if_right"
multiplicity = "right"

[[constraints.bit_shift]]
kind = "template"
tag = "IsZero"
kind = "interaction"
tag = "ZERO"
input = ["bit_shift"]
output = "zbs"
ref = "shift:c:zbs"
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