PCMPEQQ (Intel x86/64 assembly instruction)

모두의 코드
PCMPEQQ (Intel x86/64 assembly instruction)

작성일 : 2020-09-01 이 글은 681 번 읽혔습니다.

PCMPEQQ

Compare Packed Qword Data for Equal

참고 사항

아래 표를 해석하는 방법은 x86-64 명령어 레퍼런스 읽는 법 글을 참조하시기 바랍니다.

Opcode/ Instruction	Op/ En	64/32 bit Mode Support	CPUID Feature Flag	Description
`66 0F 38 29 /r` PCMPEQQ xmm1 xmm2/m128	RM	V/V	SSE4_1	Compare packed qwords in xmm2/m128 and xmm1 for equality.
`VEX.NDS.128.66.0F38.WIG 29 /r` VPCMPEQQ xmm1 xmm2 xmm3/m128	RVM	V/V	AVX	Compare packed quadwords in xmm3/m128 and xmm2 for equality.
`VEX.NDS.256.66.0F38.WIG 29 /r` VPCMPEQQ ymm1 ymm2 ymm3 /m256	RVM	V/V	AVX2	Compare packed quadwords in ymm3/m256 and ymm2 for equality.
`EVEX.NDS.128.66.0F38.W1 29 /r` VPCMPEQQ k1 {k2} xmm2 xmm3/m128/m64bcst	FV	V/V	AVX512VL AVX512F	Compare Equal between int64 vector xmm2 and int64 vector xmm3/m128/m64bcst, and set vector mask k1 to reflect the zero/nonzero status of each element of the result, under writemask.
`EVEX.NDS.256.66.0F38.W1 29 /r` VPCMPEQQ k1 {k2} ymm2 ymm3/m256/m64bcst	FV	V/V	AVX512VL AVX512F	Compare Equal between int64 vector ymm2 and int64 vector ymm3/m256/m64bcst, and set vector mask k1 to reflect the zero/nonzero status of each element of the result, under writemask.
`EVEX.NDS.512.66.0F38.W1 29 /r` VPCMPEQQ k1 {k2} zmm2 zmm3/m512/m64bcst	FV	V/V	AVX512F	Compare Equal between int64 vector zmm2 and int64 vector zmm3/m512/m64bcst, and set vector mask k1 to reflect the zero/nonzero status of each element of the result, under writemask.

Instruction Operand Encoding

Op/En	Operand 1	Operand 2	Operand 3	Operand 4
RM	ModRM:reg (r, w)	ModRM:r/m (r)	NA	NA
RVM	ModRM:reg (w)	VEX.vvvv (r)	ModRM:r/m (r)	NA
FV	ModRM:reg (w)	EVEX.vvvv (r)	ModRM:r/m (r)	NA

Description

Performs an SIMD compare for equality of the packed quadwords in the destination operand (first operand) and the source operand (second operand). If a pair of data elements is equal, the corresponding data element in the desti-nation is set to all 1s; otherwise, it is set to 0s.

128-bit Legacy SSE version: The second source operand can be an XMM register or a 128-bit memory location. The first source and destination operands are XMM registers. Bits (VLMAX-1:128) of the corresponding YMM destination register remain unchanged.

VEX.128 encoded version: The second source operand can be an XMM register or a 128-bit memory location. The first source and destination operands are XMM registers. Bits (VLMAX-1:128) of the corresponding YMM register are zeroed.

VEX.256 encoded version: The first source operand is a YMM register. The second source operand is a YMM register or a 256-bit memory location. The destination operand is a YMM register.

EVEX encoded VPCMPEQQ: The first source operand (second operand) is a ZMM/YMM/XMM register. The second source operand can be a ZMM/YMM/XMM register, a 512/256/128-bit memory location or a 512/256/128-bit vector broadcasted from a 64-bit memory location. The destination operand (first operand) is a mask register updated according to the writemask k2.

Operation

PCMPEQQ (with 128-bit operands)

IF (DEST[63:0] = SRC[63:0]) 
    THEN DEST[63:0] <-  FFFFFFFFFFFFFFFFH;
    ELSE DEST[63:0] <-  0; FI;
IF (DEST[127:64] = SRC[127:64]) 
    THEN DEST[127:64] <-  FFFFFFFFFFFFFFFFH;
    ELSE DEST[127:64] <-  0; FI;
DEST[MAX_VL-1:128] (Unmodified)

COMPARE_QWORDS_EQUAL (SRC1, SRC2)

    IF SRC1[63:0] = SRC2[63:0]
    THEN DEST[63:0] <- FFFFFFFFFFFFFFFFH;
    ELSE DEST[63:0] <- 0; FI;
    IF SRC1[127:64] = SRC2[127:64]
    THEN DEST[127:64] <- FFFFFFFFFFFFFFFFH;
    ELSE DEST[127:64] <- 0; FI;

VPCMPEQQ (VEX.128 encoded version)

DEST[127:0] <- COMPARE_QWORDS_EQUAL(SRC1,SRC2)
DEST[VLMAX-1:128] <-  0

VPCMPEQQ (VEX.256 encoded version)

DEST[127:0] <- COMPARE_QWORDS_EQUAL(SRC1[127:0],SRC2[127:0])
DEST[255:128] <- COMPARE_QWORDS_EQUAL(SRC1[255:128],SRC2[255:128])
DEST[VLMAX-1:256] <-  0

VPCMPEQQ (EVEX encoded versions)

(KL, VL) = (2, 128), (4, 256), (8, 512)
FOR j <-  0 TO KL-1
    i <-  j * 64
    IF k2[j] OR *no writemask*
          THEN 
                IF (EVEX.b = 1) AND (SRC2 *is memory*)
                      THEN CMP <-  SRC1[i+63:i] = SRC2[63:0];
                      ELSE CMP <-  SRC1[i+63:i] = SRC2[i+63:i];
                FI;
                IF CMP = TRUE
                      THEN DEST[j] <-  1;
                      ELSE DEST[j] <-  0; FI;
          ELSE  DEST[j] <-  0 ; zeroing-masking only
    FI;
ENDFOR
DEST[MAX_KL-1:KL] <-  0

Intel C/C++ Compiler Intrinsic Equivalent

VPCMPEQQ __mmask8 _mm512_cmpeq_epi64_mask(__m512i a, __m512i b);
VPCMPEQQ __mmask8 _mm512_mask_cmpeq_epi64_mask(__mmask8 k, __m512i a,
                                               __m512i b);
VPCMPEQQ __mmask8 _mm256_cmpeq_epi64_mask(__m256i a, __m256i b);
VPCMPEQQ __mmask8 _mm256_mask_cmpeq_epi64_mask(__mmask8 k, __m256i a,
                                               __m256i b);
VPCMPEQQ __mmask8 _mm_cmpeq_epi64_mask(__m128i a, __m128i b);
VPCMPEQQ __mmask8 _mm_mask_cmpeq_epi64_mask(__mmask8 k, __m128i a, __m128i b);
(V) PCMPEQQ : __m128i _mm_cmpeq_epi64(__m128i a, __m128i b);
VPCMPEQQ : __m256i _mm256_cmpeq_epi64(__m256i a, __m256i b);

Flags Affected

None.

SIMD Floating-Point Exceptions

None.

Other Exceptions

Non-EVEX-encoded instruction, see Exceptions Type 4.

EVEX-encoded VPCMPEQQ, see Exceptions Type E4.

첫 댓글을 달아주세요!

강좌에 관련 없이 궁금한 내용은 여기를 사용해주세요

또는 직접 입력하세요 (댓글 수정시 비밀번호가 필요합니다)

댓글을 불러오는 중입니다..

모두의 코드 PCMPEQQ (Intel x86/64 assembly instruction)