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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.

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.