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bug: add shf0 == shift.cells[0] constraint to shlshr #372

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Feb 3, 2023
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bug: add shf0 == shift.cells[0] constraint to shlshr #372

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1 change: 1 addition & 0 deletions src/zkevm_specs/evm/execution/shl_shr.py
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Original file line number Diff line number Diff line change
Expand Up @@ -68,6 +68,7 @@ def check_witness(
instruction.constrain_equal(
push.expr(), (is_shl * dividend.expr() + is_shr * quotient.expr()) * (1 - divisor_is_zero)
)
instruction.constrain_zero(shf0 - FQ(shift.le_bytes[0]))

# Constrain shift == shift.cells[0] when divisor != 0.
instruction.constrain_zero(
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