ARMv8-A: Is an ISB instruction required after writing to the CPSR register in AARCH32 state?

For example, write cpsr as following code snippets: mov r1, sp movw lr, #0x393 movt lr, #0 msr cpsr_cxsf, lr do_irq: ... Is an ISB instruction required after " msr cpsr_cxsf, lr "? Thank...
ARMv8-A: Is an ISB instruction required after writing to the CPSR register in AARCH32 state?

For example, write cpsr as following code snippets: mov r1, sp movw lr, #0x393 movt lr, #0 msr cpsr_cxsf, lr do_irq: ... Is an ISB instruction required after " msr cpsr_cxsf, lr "? Thank...
DMB, DSB, ISB instructions

Can anyone explain in simple english when these instructions must be used. I have read the manuals and have some kind of idea, but obviously my english skills are not good enough to fully understand...
DMB, DSB, ISB instructions

Can anyone explain in simple english when these instructions must be used. I have read the manuals and have some kind of idea, but obviously my english skills are not good enough to fully understand...
DAIF related instructions/operations are very expensive on Cortex-A72(Armv8.0) compared to Cortex-A53.

Hi, We discovered that some special register operations are very expensive on Cortex-A72(Armv8.0) compared to Cortex-A53. Is there any way to narrow the gap? Thanks. Results as below, Operation cost...