pkarashchenko commented on code in PR #7285:
URL: https://github.com/apache/incubator-nuttx/pull/7285#discussion_r993301685
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mm/ubsan/ubsan.c:
##########
@@ -160,7 +160,7 @@ static int64_t get_signed_val(FAR struct type_descriptor
*type,
unsigned extra_bits = sizeof(int64_t) * 8 - type_bit_width(type);
uintptr_t ulong_val = (uintptr_t)val;
- return ((int64_t)ulong_val) << extra_bits >> extra_bits;
+ return (int64_t)(ulong_val << extra_bits >> extra_bits);
Review Comment:
maybe we can make something like
```
unsigned extra_bits = sizeof(int64_t) * 8 - type_bit_width(type);
uint64_t mask = 1llu << extra_bits;
uint64_t ret = (uint64_t)val & mask;
return (int64_t)(ret & (1ll << (extra_bits - 1)) != 0 ? ret | ~mask : ret);
```
? Or something similar
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