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VSM3MSG2

Perform Final Calculation for the Next Four SM3 Message Words

stableVMJITAOTinstruction

Encodings

OpcodeInstructionOp/En64-bitCompat/LegacyDescription
VEX.128.66.0F38.W0 DA /rVSM3MSG2 xmm1, xmm2, xmm3/m128AValidValidPerforms the final calculation for the next four SM3 SM3 message words using previous message words from xmm2 and xmm3/m128, storing the result in xmm1.

Operand encoding

Each mode is a value of the Op/En column above. It says which field of the encoded instruction carries each operand, in the order they are written, and whether the instruction reads it, writes it or both.

A

  1. modrm.reg lectura y escrituraModRM byte, reg field (bits 5-3)
  2. vex.vvvv lecturaVEX prefix, vvvv field (inverted)
  3. modrm.rm lecturaModRM byte, r/m field (bits 2-0); with the SIB byte and the displacement when the mod field asks for them

Measured cost

Loading measurements from arch-data...

Description

The VSM3MSG2 instruction is one of the two SM3 message scheduling instructions. The instruction performs the final calculation for the next four SM3 message words.

Operation

//see the VSM3MSG1 instruction for definition of ROL32()

VSM3MSG2 SRCDEST, SRC1, SRC2

WTMP[0] := SRCDEST.dword[0]
WTMP[1] := SRCDEST.dword[1]
WTMP[2] := SRCDEST.dword[2]
WTMP[3] := SRCDEST.dword[3]

// Dword array W[] has indices are based on the SM3 specification.
W[3] := SRC1.dword[0]
W[4] := SRC1.dword[1]
W[5] := SRC1.dword[2]
W[6] := SRC1.dword[3]
W[10] := SRC2.dword[0]
W[11] := SRC2.dword[1]
W[12] := SRC2.dword[2]
W[13] := SRC2.dword[3]

W[16] := ROL32(W[3], 7) ^ W[10] ^ WTMP[0]
W[17] := ROL32(W[4], 7) ^ W[11] ^ WTMP[1]
W[18] := ROL32(W[5], 7) ^ W[12] ^ WTMP[2]
W[19] := ROL32(W[6], 7) ^ W[13] ^ WTMP[3]

W[19] := W[19] ^ ROL32(W[16], 6) ^ ROL32(W[16], 15) ^ ROL32(W[16], 30)

SRCDEST.dword[0] := W[16]
SRCDEST.dword[1] := W[17]
SRCDEST.dword[2] := W[18]
SRCDEST.dword[3] := W[19]

Flags affected

None.

Intel C/C++ compiler intrinsics

VSM3MSG2 __m128i _mm_sm3msg2_epi32 (__m128i __A, __m128i __B, __m128i __C);

SIMD Floating-Point Exceptions

None.

Other Exceptions

See Table 2-21, "Type 4 Class Exception Conditions."

Sources