Unaligned access to Cacheable write-back memory space - store/load miss access in L1 cache in any case issue read aligned access to the system. Means value of the address (AxADDR) is a multiple of the size of the data being transferred (AxSIZE). In your example, the 32-bit unaligned transaction will be fetched by the L1 cache as 32 bytes (cache

Feb 18, 2020 SSE and AVX behavior with aligned/unaligned instructions The penalty for 256 bit unaligned access on Sandy bridge was so large that compilers would always split access to 128 bit pairs. Ivy bridge greatly reduced the penalty but not to the extent that compilers needed to eliminate the splitting. Intel compilers when directed to generate both Sandy and ivy bridge paths should produce only the path overview for unaligned_access - Reddit

Feb 18, 2020

How to Access Safely Unaligned Data – Alfonso Sánchez

The libraries include special versions of certain library functions designed to exploit unaligned accesses. To prevent these enhanced library functions being used when unaligned access support is disabled, you have to specify --no_unaligned_access on both the compiler command line and the assembler command line when compiling a mixture of C and C++ source files and asssembly language source files.

Unaligned access to Cacheable write-back memory space - store/load miss access in L1 cache in any case issue read aligned access to the system. Means value of the address (AxADDR) is a multiple of the size of the data being transferred (AxSIZE). In your example, the 32-bit unaligned transaction will be fetched by the L1 cache as 32 bytes (cache How to Access Safely Unaligned Data – Alfonso Sánchez After zeroing the memory, we access mem and mem + 1 by casting to different pointer types, knowing that the second address is odd, and therefore unaligned except for char * access. I compiled the file with g++ on my laptop, ran it, and got Architectures | Armv8-A memory model – Arm Developer