SHA256H2

SHA-256 hash update (part 2)

SHA-256 hash update (part 2).

Advanced SIMD
(FEAT_SHA256)

313029282726252423222120191817161514131211109876543210
01011110000Rm010100RnRd
sizeP

Encoding

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

Decode for this encoding

if !IsFeatureImplemented(FEAT_SHA256) then EndOfDecode(Decode_UNDEF); end; let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn); let m : integer{} = UInt(Rm);

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(); let part1 : boolean = FALSE; V{128}(d) = SHA256hash(V{128}(n), V{128}(d), V{128}(m), part1);

Operational information

This instruction is a data-independent-time instruction as described in About PSTATE.DIT.


2026-03_rel 2026-03-26 20:48:11

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