https://bugs.llvm.org/show_bug.cgi?id=32230
David Majnemer <david.majnemer at gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |david.majnemer at gmail.com
Status|NEW |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from David Majnemer <david.majnemer at gmail.com> ---
This works as intended, the compiler is obligated to use the alignment of
uint64_t for the load which, in this case, is eight bytes.
If you want to achieve the desired effect, do the following instead:
#include <cstdint>
#include <cstring>
using namespace std;
void test(uint8_t *ptr, long *buf, int const N) {
for (int I = 0; I < N - 7; ++I) {
uint64_t big;
memcpy(&big, ptr + I, sizeof(big));
buf[I] = big * big;
}
}
In the IR, you will now see something along the lines of:
%14 = load i64, i64* %13, align 1
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