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Source code

SHA1NEXTE

Calculate SHA1 State Variable E After Four Rounds

stableVMJITAOTinstruction

Encodings

OpcodeInstructionOp/En64-bitCompat/LegacyDescription
NP 0F 38 C8 /rSHA1NEXTE xmm1, xmm2/m128RMValidValidCalculates 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.

Operand encoding

Each mode is a value of the Op/En column above. It says which field of the encoded instruction carries each operand, in the order they are written, and whether the instruction reads it, writes it or both.

RM

  1. modrm.reg lectura y escrituraModRM byte, reg field (bits 5-3)
  2. modrm.rm lecturaModRM byte, r/m field (bits 2-0); with the SIB byte and the displacement when the mod field asks for them

Measured cost

Loading measurements from arch-data...

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 intrinsics

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."

Sources