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Optimize BigInteger constant computation #3453

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MikaelMayer opened this issue Feb 3, 2023 · 1 comment
Open

Optimize BigInteger constant computation #3453

MikaelMayer opened this issue Feb 3, 2023 · 1 comment
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kind: enhancement Enhancements, feature requests, etc. These are NOT bugs, but ways we can improve Dafny lang: c# Dafny's C# transpiler and its runtime lang: java Dafny's Java transpiler and its runtime part: code-generation Support for transpiling Dafny to another language. If relevant, add a `lang:` tag

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@MikaelMayer
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Summary

function go(): nat {
  2 * 3 * 4
}

is compiled to a multiplication of big integers instead of in the result itself. There should be a flag to optimize constant folding so that there is only one big integer instead of a computation is has to do every time.

Background and Motivation

Every other compiler has optimization flags.

Proposed Feature

see above.

Alternatives

Writing the result is not practical.
@MikaelMayer MikaelMayer added kind: enhancement Enhancements, feature requests, etc. These are NOT bugs, but ways we can improve Dafny kind: bug Crashes, unsoundness, incorrect output, etc. If possible, add a `part:` label part: code-generation Support for transpiling Dafny to another language. If relevant, add a `lang:` tag lang: java Dafny's Java transpiler and its runtime lang: c# Dafny's C# transpiler and its runtime and removed kind: bug Crashes, unsoundness, incorrect output, etc. If possible, add a `part:` label labels Feb 3, 2023
@fabiomadge
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Why is this preferable to having the target language compiler take care of it?

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kind: enhancement Enhancements, feature requests, etc. These are NOT bugs, but ways we can improve Dafny lang: c# Dafny's C# transpiler and its runtime lang: java Dafny's Java transpiler and its runtime part: code-generation Support for transpiling Dafny to another language. If relevant, add a `lang:` tag
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@fabiomadge @MikaelMayer