/// Both-constant SMOD variants. Selector index is read from calldata[0..32]
/// and dispatched to a branch with two literal operands. Compiled directly via
/// revive's Yul-to-LLVM path (bypassing solc's Yul optimizer) so the literals
/// reach LLVM intact and exercise revive's "two literal operands" codegen path.
///
/// Case 15 — smod(INT_MIN, -1) — surfaces the bug reported in
/// paritytech/revive#524: LLVM constant-folds `srem(INT_MIN, -1)` to poison
/// because the operation is signed-overflow UB in LLVM, even though EVM SMOD
/// defines it as 0.
object "SmodBothConst" {
code {
let size := datasize("SmodBothConst_deployed")
codecopy(0, dataoffset("SmodBothConst_deployed"), size)
return(0, size)
}
object "SmodBothConst_deployed" {
code {
let which := calldataload(0)
// `tag` is XORed into every result so that any poison/undef LLVM
// produces from a UB-triggering const-fold propagates and diverges
// from EVM, rather than coincidentally collapsing to 0 (which is
// also EVM SMOD's defined result for INT_MIN op -1).
let tag := calldataload(32)
switch which
case 0 { mstore(0, xor(smod(5, 5), tag)) }
case 1 { mstore(0, xor(smod(5, 1), tag)) }
case 2 { mstore(0, xor(smod(0, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff), tag)) }
case 3 { mstore(0, xor(smod(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff), tag)) }
case 4 { mstore(0, xor(smod(5, 2), tag)) }
case 5 { mstore(0, xor(smod(2, 5), tag)) }
case 6 { mstore(0, xor(smod(5, 0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffb), tag)) }
case 7 { mstore(0, xor(smod(5, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff), tag)) }
case 8 { mstore(0, xor(smod(5, 0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe), tag)) }
case 9 { mstore(0, xor(smod(0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffb, 2), tag)) }
case 10 { mstore(0, xor(smod(0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe, 5), tag)) }
case 11 { mstore(0, xor(smod(0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffb, 0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffb), tag)) }
case 12 { mstore(0, xor(smod(0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffb, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff), tag)) }
case 13 { mstore(0, xor(smod(0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffb, 0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe), tag)) }
case 14 { mstore(0, xor(smod(0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe, 0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffb), tag)) }
case 15 { mstore(0, xor(smod(0x8000000000000000000000000000000000000000000000000000000000000000, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff), tag)) }
case 16 { mstore(0, xor(smod(0, 0), tag)) }
default { revert(0, 0) }
return(0, 32)
}
}
}