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SHA256MSG1—Perform an Intermediate Calculation for the Next Four SHA256 Message Dwords

Opcode/Instruction Op/En 64/32 bit Mode Support CPUID Feature Flag Description

0F 38 CC /r

SHA256MSG1 xmm1, xmm2/m128

RM V/V SHA Performs an intermediate 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

Description

The SHA256MSG1 instruction is one of two SHA256 message scheduling instructions. The instruction performs an intermediate calculation for the next four SHA256 message dwords.

Operation


SHA256MSG1
W4 (cid:197) SRC2[31: 0] ;
W3 (cid:197) SRC1[127:96] ;
W2 (cid:197) SRC1[95:64] ;
W1 (cid:197) SRC1[63: 32] ;
W0 (cid:197) SRC1[31: 0] ;
DEST[127:96] (cid:197) W3 + σ0( W4);
DEST[95:64] (cid:197) W2 + σ0( W3);
DEST[63:32] (cid:197) W1 + σ0( W2);
DEST[31:0] (cid:197) W0 + σ0( W1);

Intel C/C++ Compiler Intrinsic Equivalent

SHA256MSG1: __m128i _mm_sha256msg1_epu32(__m128i, __m128i);

Flags Affected

None

SIMD Floating-Point Exceptions

None

Other Exceptions

See Exceptions Type 4.