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

Phenix Chen

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 you in advance!