SHA256MSG2 — Perform a Final Calculation for the Next Four SHA256 Message Dwords

Opcode/Instruction Op/En 64/32 bit Mode Support CPUID Feature Flag Description
NP 0F 38 CD /r SHA256MSG2 xmm1, xmm2/m128 RM V/V SHA Performs the final calculation for the next four SHA256 message dwords using previous message dwords from xmm1 and xmm2/m128, storing the result in xmm1.

Instruction Operand Encoding

Op/En Operand 1 Operand 2 Operand 3
RM ModRM:reg (r, w) ModRM:r/m (r) NA


The SHA256MSG2 instruction is one of two SHA2 message scheduling instructions. The instruction performs the final calculation for the next four SHA256 message dwords.



W14←SRC2[95:64] ;
W15←SRC2[127:96] ;
W16 ← SRC1[31: 0] + σ1( W14) ;
W17 ← SRC1[63: 32] + σ1( W15) ;
W18 ← SRC1[95: 64] + σ1( W16) ;
W19 ← SRC1[127: 96] + σ1( W17) ;
DEST[127:96]←W19 ;
DEST[95:64]←W18 ;
DEST[63:32]←W17 ;
DEST[31:0] ← W16;

Intel C/C++ Compiler Intrinsic Equivalent

SHA256MSG2 : __m128i _mm_sha256msg2_epu32(__m128i, __m128i);

Flags Affected


SIMD Floating-Point Exceptions


Other Exceptions

See Exceptions Type 4.