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SETFFR

Initialise the first-fault register to all true.

Initialise the first-fault register (FFR) to all true prior to a sequence of first-fault or non-fault loads. This instruction is unpredicated.

313029282726252423222120191817161514131211109876543210
00100101001011001001000000000000

SETFFR

if !HaveSVE() then UNDEFINED;

Operation

CheckSVEEnabled();
FFR[] = Ones(PL);

Operational information

If PSTATE.DIT is 1:

  • The execution time of this instruction is independent of:
    • The values of the data supplied in any of its registers.
    • The values of the NZCV flags.
  • The response of this instruction to asynchronous exceptions does not vary based on:
    • The values of the data supplied in any of its registers.
    • The values of the NZCV flags.