Opcode/Instruction | Op/En | 64/32 bit Mode Support | CPUID Feature Flag | Description |
---|---|---|---|---|
NP 0F 3A CC /r ib SHA1RNDS4 xmm1, xmm2/m128, imm8 | RMI | V/V | SHA | Performs four rounds of SHA1 operation operating on SHA1 state (A,B,C,D) from xmm1, with a pre-computed sum of the next 4 round message dwords and state variable E from xmm2/m128. The immediate byte controls logic functions and round constants. |
Op/En | Operand 1 | Operand 2 | Operand 3 |
---|---|---|---|
RMI | ModRM:reg (r, w) | ModRM:r/m (r) | imm8 |
The SHA1RNDS4 instruction performs four rounds of SHA1 operation using an initial SHA1 state (A,B,C,D) from the first operand (which is a source operand and the destination operand) and some pre-computed sum of the next 4 round message dwords, and state variable E from the second operand (a source operand). The updated SHA1 state (A,B,C,D) after four rounds of processing is stored in the destination operand.
The function f() and Constant K are dependent on the value of the immediate. IF ( imm8[1:0] = 0 ) THEN f() := f0(), K := K0; ELSE IF ( imm8[1:0] = 1 ) THEN f() := f1(), K := K1; ELSE IF ( imm8[1:0] = 2 ) THEN f() := f2(), K := K2; ELSE IF ( imm8[1:0] = 3 ) THEN f() := f3(), K := K3; FI; A := SRC1[127:96]; B := SRC1[95:64]; C := SRC1[63:32]; D := SRC1[31:0]; W0E := SRC2[127:96]; W1 := SRC2[95:64]; W2 := SRC2[63:32]; W3 := SRC2[31:0]; Round i = 0 operation: A_1 := f (B, C, D) + (A ROL 5) +W0E +K; B_1 := A; C_1 := B ROL 30; D_1 := C; E_1 := D; FOR i = 1 to 3 A_(i +1) := f (B_i, C_i, D_i) + (A_i ROL 5) +Wi+ E_i +K; B_(i +1) := A_i; C_(i +1) := B_i ROL 30; D_(i +1) := C_i; E_(i +1) := D_i; ENDFOR DEST[127:96] := A_4; DEST[95:64] := B_4; DEST[63:32] := C_4; DEST[31:0] := D_4;
SHA1RNDS4 __m128i _mm_sha1rnds4_epu32(__m128i, __m128i, const int);
None.
None.
See Table 2-21, “Type 4 Class Exception Conditions.”