> If so, is libc malloc supposed to ensure alignment of allocated memory? > According to https://man7.org/linux/man-pages/man3/malloc.3.html yes. > @Janneke: So our mes libc malloc should be aligning the stuff--but it's not > doing it. So it's a bug in our libc.
Looks like you'll have to waste 3.7bytes on average per malloc to always pad to the 8byte boundary. -Jeremiah