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SHA256H2

SHA256 hash update (part 2).

313029282726252423222120191817161514131211109876543210
01011110000Rm010100RnRd
P

Advanced SIMD

SHA256H2 <Qd>, <Qn>, <Vm>.4S

integer d = UInt(Rd);
integer n = UInt(Rn);
integer m = UInt(Rm);
if !HaveSHA256Ext() then UNDEFINED;

Assembler Symbols

<Qd>

Is the 128-bit name of the SIMD&FP source and destination, encoded in the "Rd" field.

<Qn>

Is the 128-bit name of the second SIMD&FP source register, encoded in the "Rn" field.

<Vm>

Is the name of the third SIMD&FP source register, encoded in the "Rm" field.

Operation

AArch64.CheckFPAdvSIMDEnabled();

bits(128) result;
result = SHA256hash(V[n], V[d], V[m], FALSE);
V[d] = result;

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.