dsb and dmb

Hi all: I have some questions about DMB and DSB in armv8. (1) In armv8 Reference Manual doc, it says " The DMB instruction does not ensure the completion of any of the memory accesses for which...
Memory barrier (DSB, DMB). Does they guarantee writing data on cache to memory?

Hi Experts, I'm reading white paper for ARMv7 and ARMv8. but when i reading cache part and memory re-ordering, i have silly questions..... Suppose there are below instructions.. Core A: STR R0...
DMB, DSB, ISB on Cortex M3,M4,M7 Single Core parts

I have been reading through the ARM documentation on memory and instruction barriers. I have read that the single core ARMv7-M parts do not reorder instructions, as such the DSB and ISB are not needed...
What is the equivalent instruction for QSUB in ARMv8?

This is sort of intriguing for me. I couldn't find any saturation instructions using general purpose register in ARMv8. However, there are saturation instructions for Neon registers I couldn't find the...
why some instructions are not required to be explicitly synchronized ?

Dear all: In "ARM® Architecture Reference Manual ARMv8", B2.6.5 Concurrent modification and execution of instructions , it says some instructions, such as " B, BL, NOP, BRK, SVC, HVC, and SMC " dont need...