Super-minimal POC for bounded translation validation #7169
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GlobalStructInference optimizes gets of immutable fields of structs that are only ever instantiated to initialize immutable globals. Due to all the immutability, it's not possible for the optimized reads to synchronize with any writes via the accessed memory, so we just need to be careful to replace removed seqcst gets with seqcst fences. As a drive-by, fix some stale comments in gsi.wast.
Given a source and target module, validate that the functions in the
target module are refinements of the corresponding functions in the
source module by translating the function bodies to SMT expressions and
having Z3 either prove that they are equal for all inputs or find a
counterexample showing that they are not.
This minimal proof-of-concept can already prove that this source module:
```
(func $test (param $x i32) (result i32)
(i32.mul
(local.get 0)
(i32.const 2)
)
)
```
Is refined by this target module:
```
(func $test (param $x i32) (result i32)
(i32.shl
(local.get 0)
(i32.const 1)
)
)
```
But not by this target module:
```
(func $test (param $x i32) (result i32)
(i32.shl
(local.get 0)
(i32.const 2)
)
)
```
kripken
reviewed
Dec 20, 2024
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Given a source and target module, validate that the functions in the
target module are refinements of the corresponding functions in the
source module by translating the function bodies to SMT expressions and
having Z3 either prove that they are equal for all inputs or find a
counterexample showing that they are not.
This minimal proof-of-concept can already prove that this source module:
Is refined by this target module:
But not by this target module: