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Implement -Wtruncation=level (#931)

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* Implement -Wtruncation=level

-Wtruncation=0 is the same as the current -Wno-truncation.
-Wtruncation=2 is the same as the current -Wtruncation.
-Wtruncation=1 is the new default; it's less strict, allowing
N-bit values to be between -2**N and 2**N (exclusive).

* Implement generic "parametrized warning" system

* Test more `Wtruncation` variants

Co-authored-by: ISSOtm <eldredhabert0@gmail.com>
This commit is contained in:
Rangi
2021-10-31 17:47:31 -04:00
committed by GitHub
parent 0ce66009c1
commit 11a6a81169
8 changed files with 267 additions and 47 deletions
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6
src/asm/rpn.c
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@@ -284,8 +284,10 @@ void rpn_CheckNBit(struct Expression const *expr, uint8_t n)
if (rpn_isKnown(expr)) {
int32_t val = expr->val;
if (val < -(1 << (n - 1)) || val >= 1 << n)
warning(WARNING_TRUNCATION, "Expression must be %u-bit\n", n);
if (val <= -(1 << n) || val >= 1 << n)
warning(WARNING_TRUNCATION_1, "Expression must be %u-bit\n", n);
else if (val < -(1 << (n - 1)))
warning(WARNING_TRUNCATION_2, "Expression must be %u-bit\n", n);
}
}