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."