- 1 year ago
Crash when using an address with xorps/xorpd in x64 assembly
The crash when using an address with xorps/xorpd
in x64 assembly can happen if the address is not aligned to 16 bytes boundary. xorps/xorpd
instructions require the address operand to be 16-byte aligned to avoid a bus error.
To fix this issue, ensure that the address operand is 16-byte aligned before using it with xorps/xorpd
. You can use the align
directive in assembly to ensure that the data is aligned to a specific byte boundary. For example, to align the address operand to a 16-byte boundary, you can use the following code:
align 16
address_operand dq ?
Alternatively, you can use the _aligned_malloc()
function from the Windows API to allocate memory that is guaranteed to be aligned to a specific byte boundary. For example, to allocate 16-byte aligned memory, you can use the following code:
arduino#include <malloc.h>
void* aligned_memory = _aligned_malloc(size, 16);
By ensuring that the address operand is 16-byte aligned, you can prevent the crash when using xorps/xorpd
instructions in x64 assembly.