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Simplifier: c_bool (and others) are also bitvector types #8247

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Remove simplifier's own is_bitvector_type in favour of using can_cast_type<bitvector_typet>, which will make sure that expressions like bitxor(false, false) over c_bool types gets simplified. Such expressions were seen in Kani (the C front-end would promote bitxor operands to int, and, therefore, not end up in this code path).

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@tautschnig tautschnig added aws-high Kani Bugs or features of importance to Kani Rust Verifier labels Mar 20, 2024
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codecov bot commented Mar 20, 2024

Codecov Report

Attention: Patch coverage is 75.00000% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 78.32%. Comparing base (905033e) to head (a697de0).
Report is 2 commits behind head on develop.

Files Patch % Lines
src/util/simplify_expr_int.cpp 66.66% 5 Missing ⚠️
unit/util/simplify_expr.cpp 88.88% 1 Missing ⚠️
Additional details and impacted files
@@             Coverage Diff             @@
##           develop    #8247      +/-   ##
===========================================
- Coverage    78.32%   78.32%   -0.01%     
===========================================
  Files         1721     1721              
  Lines       188210   188243      +33     
  Branches     18462    18517      +55     
===========================================
+ Hits        147416   147435      +19     
- Misses       40794    40808      +14     

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@kroening
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kroening commented May 1, 2024

Can we test this somehow? The simplifier may be a good use-case for unit tests.

@tautschnig
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Can we test this somehow? The simplifier may be a good use-case for unit tests.

Done!

Remove simplifier's own is_bitvector_type in favour of using
can_cast_type<bitvector_typet>, which will make sure that expressions
like bitxor(false, false) over c_bool types gets simplified. Such
expressions were seen in Kani (the C front-end would promote bitxor
operands to int, and, therefore, not end up in this code path).
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