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Expose bug #5

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Merged
thomas-quadratic merged 1 commit into from
Feb 24, 2026
Merged

Expose bug #5

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15 changes: 15 additions & 0 deletions evm/src/test/java/org/hyperledger/besu/evm/UInt256Test.java
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Original file line number Diff line number Diff line change
Expand Up @@ -499,6 +499,21 @@ public void mulMod() {
}
}

@Test
public void uint512IsUInt64() {
// All high limbs zero — fits in 64 bits
var fitsIn64 = new UInt256.UInt512(0, 0, 0, 0, 0, 0, 0, 42);
assertThat(fitsIn64.isUInt64()).as("all high limbs zero").isTrue();

// u7=1, u6=2: AND gives 0 but OR gives 3 — does NOT fit in 64 bits
var andMasksToZero = new UInt256.UInt512(1, 2, 0, 0, 0, 0, 0, 42);
assertThat(andMasksToZero.isUInt64()).as("u7=1,u6=2 should not fit in 64 bits").isFalse();

// Only u1 is non-zero — does NOT fit in 64 bits
var singleHighLimb = new UInt256.UInt512(0, 0, 0, 0, 0, 0, 1, 42);
assertThat(singleHighLimb.isUInt64()).as("u1=1 should not fit in 64 bits").isFalse();
}

@Test
public void signedMod() {
final Random random = new Random(432);
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