test(avm): integration test for alu truncation#22684
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Looks good (modulo us figuring out what to do with tests that rely on TS opcodes folder)
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LGTM, but just want to better understand exactly what each test is testing.
| // Exercise SET truncation: set values whose widths exceed the target tag and | ||
| // rely on `buildFromTagTruncating` to truncate to the low bits of the tag. | ||
| // Covers sources larger than 128 bits (via SET_FF) and sources in (32, 128] | ||
| // bits (via SET_64) against destination tags U1/U8/U16/U32/U64/U128. | ||
| export async function setTruncationTest(tester: PublicTxSimulationTester) { | ||
| // 200-bit value: forces truncation for every target tag up to U128. |
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What exactly is this testing? The AVM? Or buildFromTagTruncating in TS?
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The goal is to test the AVM circuit as a whole in the presence of truncation performed by CAST and or SET. The rationale about adding this test is a recent change which removed the possibility to pass larger values than their type in the bulk test. To still keep the same testing coverage, I opened a ticket which resulted into the present PR. I made it a bit more exhaustive by testing more target types and covering both SET and CAST.
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Linear issue: AVM-267