# SHA1NEXTE — Calculate SHA1 State Variable E After Four Rounds

Opcode/Instruction | Op/En | 64/32 bit Mode Support | CPUID Feature Flag | Description
--- | --- | --- | --- | ---
NP 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) | N/A

## 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 := (SRC1[127:96] ROL 30);
    DEST[127:96] := SRC2[127:96] + TMP;
    DEST[95:64] := SRC2[95:64];
    DEST[63:32] := SRC2[63:32];
    DEST[31:0] := 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 Table 2-21, “Type 4 Class Exception Conditions.”