Tiny improvements in codegen in C backend #7337
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(1) Emit `true` or `false` instead of `(bool)(0ull)` etc for bool literals (2) Avoid redundant temporaries in print_cast_expr(), which occur in a small but nonzero number of cases Basically this means that code currently like ``` bool _523 = (bool)(0ull); bool _524 = (bool)(_523); ... foo(_524); ``` becomes ``` foo(false); ``` ...I'm sure this has no output on final object code, but it makes the generated C code less weird to read.
abadams
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Feb 10, 2023
vksnk
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Feb 10, 2023
ardier
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Mar 3, 2024
* Tiny improvements in codegen in C backend (1) Emit `true` or `false` instead of `(bool)(0ull)` etc for bool literals (2) Avoid redundant temporaries in print_cast_expr(), which occur in a small but nonzero number of cases Basically this means that code currently like ``` bool _523 = (bool)(0ull); bool _524 = (bool)(_523); ... foo(_524); ``` becomes ``` foo(false); ``` ...I'm sure this has no output on final object code, but it makes the generated C code less weird to read. * Also avoid extra intermediates for typed nullptr * Also use std::isnan() and std::isinf() * Update CodeGen_C.cpp
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(1) Emit
trueorfalseinstead of(bool)(0ull)etc for bool literals (2) Avoid redundant temporaries in print_cast_expr(), which occur in a small but nonzero number of casesBasically this means that code currently like
becomes
...I'm sure this has no output on final object code, but it makes the generated C code less weird to read.
EDIT: (2), do something similar when emitting nullptr constants.
(3), it's 2023, we no longer need to roll our own
isnan()andisinf()