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Simplify exponentiation over conditional constants - #1250
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gustavo-grieco wants to merge 1 commit into
Open
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gustavo-grieco wants to merge 1 commit into
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Description
Packed-array writes can produce
256 ** ITE(condition, 28, 4)after branch merging, causing SMT encoding to fail withCannot encode symbolic exponent. Extend the existing literal-branch ITE helper to exponentiation so these powers fold to constants. The production change is two lines.The Solidity regression selects index 1 or 7 in a
uint32[8]storage array, writes that element, and asserts that element 0 is unchanged. It reproduces the encoding error on main and verifies with this change. Unit tests also cover wrapping at 256 bits, conditional bases, and operands sharing a condition; the rewrite fuzzer now generates conditional exponentiation.Validation using Stack (GHC 9.10.3), Bitwuzla, and solc 0.8.25:
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