SHA1NEXTE—Calculate SHA1 State Variable E after Four Rounds

Opcode/Instruction	Op/En	64/32 bit Mode Support	CPUID Feature Flag	Description
0F 38 C8 /r SHA1NEXTE xmm1, xmm2/m128	RM	V/V	SHA	Calculates SHA1 state variable E after four rounds of operation from the current SHA1 state variable A in xmm1. The calculated value of the SHA1 state variable E is added to the scheduled dwords in xmm2/m128, and stored with some of the scheduled dwords in xmm1.

Opcode/Instruction

Op/En

64/32 bit Mode Support

CPUID Feature Flag

Description

0F 38 C8 /r

SHA1NEXTE xmm1, xmm2/m128

V/V

SHA

Calculates SHA1 state variable E after four rounds of operation from the current SHA1 state variable A in xmm1. The calculated value of the SHA1 state variable E is added to the scheduled dwords in xmm2/m128, and stored with some of the scheduled dwords 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 SHA1NEXTE calculates the SHA1 state variable E after four rounds of operation from the current SHA1 state variable A in the destination operand. The calculated value of the SHA1 state variable E is added to the source operand, which contains the scheduled dwords.

Operation

SHA1NEXTE

TMP (cid:197) (SRC1[127:96] ROL 30);
DEST[127:96] (cid:197) SRC2[127:96] + TMP;
DEST[95:64] (cid:197) SRC2[95:64];
DEST[63:32] (cid:197) SRC2[63:32];
DEST[31:0] (cid:197) SRC2[31:0];

Intel C/C++ Compiler Intrinsic Equivalent

SHA1NEXTE: __m128i _mm_sha1nexte_epu32(__m128i, __m128i);

Flags Affected

None

SIMD Floating-Point Exceptions

None

Other Exceptions

See Exceptions Type 4.