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Stevengre merged 2 commits into from
Dec 19, 2025
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feat(spl): simplify rent minimum_balance float calculation #903

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feat(spl): simplify rent minimum_balance float calculation
Stevengre Dec 19, 2025
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round-trip track
Stevengre Dec 19, 2025
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16 changes: 16 additions & 0 deletions kmir/src/kmir/kdist/mir-semantics/symbolic/spl-token.md
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Expand Up @@ -533,6 +533,22 @@ The `#initBorrow` helper resets borrow counters to 0 and sets the correct dynami
[preserves-definedness]
```

## Rent minimum_balance calculation simplification

The rent exemption check involves: `(int)((float)(data_len * lamports_per_byte_year) * 2.0)`
Since float casts create thunks, we simplify this pattern directly to `PRODUCT * 2`.

```k
// Simplify: (int)((float)PRODUCT * 2.0) => PRODUCT * 2
rule #cast(
thunk(#applyBinOp(binOpMul,
thunk(#cast(Integer(PRODUCT:Int, 64, false), castKindIntToFloat, INT_TY, FLOAT_TY)),
Float(0.20000000000000000e1, 64),
false)),
castKindFloatToInt, FLOAT_TY, INT_TY)
=> Integer(PRODUCT *Int 2, 64, false)
```

```k
endmodule
```