Hi,
I was trying to convert REALSXP to int64_t in C, then found that converting
2^63 is inconsistent across platforms:
On M1 ARM osx, 2^63 (double) bit converting to `int64_t` becomes
9223372036854775807
On x86_64 ubuntu server, 2^63 (double) bit converting to `int64_t` is
-9223372036854775808
I was wondering if this is desired behavior to R?
Here's the code to replicate the results above.
print_bit <- Rcpp::cppFunction(r"(
SEXP print_bit(SEXP obj){
int64_t tmp1 = *REAL0(obj);
printf("%lld ", tmp1);
return(R_NilValue);
}
)")
print_bit(2^63)
Thanks,
- Dipterix
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