VPERMQ

Qwords Element Permutation

참고 사항

Instruction Operand Encoding

Description

The imm8 version: Copies quadwords from the source operand (the second operand) to the destination operand (the first operand) according to the indices specified by the immediate operand (the third operand). Each two-bit value in the immediate byte selects a qword element in the source operand.

VEX version: The source operand can be a YMM register or a memory location. Bits (MAXVL-1:256) of the corre-sponding destination register are zeroed.

In EVEX.512 encoded version, The elements in the destination are updated using the writemask k1 and the imm8 bits are reused as control bits for the upper 256-bit half when the control bits are coming from immediate. The source operand can be a ZMM register, a 512-bit memory location or a 512-bit vector broadcasted from a 64-bit memory location.

Immediate control versions: VEX.vvvv and EVEX.vvvv are reserved and must be 1111b otherwise instructions will #UD.

The vector control version: Copies quadwords from the second source operand (the third operand) to the destina-tion operand (the first operand) according to the indices in the first source operand (the second operand). The first 3 bits of each 64 bit element in the index operand selects which quadword in the second source operand to copy. The first and second operands are ZMM registers, the third operand can be a ZMM register, a 512-bit memory loca-tion or a 512-bit vector broadcasted from a 64-bit memory location. The elements in the destination are updated using the writemask k1.

Note that this instruction permits a qword in the source operand to be copied to multiple locations in the destina-tion operand.

If VPERMPQ is encoded with VEX.L= 0 or EVEX.128, an attempt to execute the instruction will cause an #UD excep-tion.

Operation

VPERMQ (EVEX - imm8 control forms)

(KL, VL) = (4, 256), (8, 512)
FOR j <-  0 TO KL-1
    i <-  j * 64
    IF (EVEX.b = 1) AND (SRC *is memory*)
          THEN TMP_SRC[i+63:i] <-  SRC[63:0];
          ELSE TMP_SRC[i+63:i] <-  SRC[i+63:i];
    FI;
ENDFOR;
    TMP_DEST[63:0] <-  (TMP_SRC[255:0] >> (IMM8[1:0] * 64))[63:0];
    TMP_DEST[127:64] <-  (TMP_SRC[255:0] >> (IMM8[3:2] * 64))[63:0];
    TMP_DEST[191:128] <-  (TMP_SRC[255:0] >> (IMM8[5:4] * 64))[63:0];
    TMP_DEST[255:192] <-  (TMP_SRC[255:0] >> (IMM8[7:6] * 64))[63:0];
IF VL >= 512
    TMP_DEST[319:256] <-  (TMP_SRC[511:256] >> (IMM8[1:0] * 64))[63:0];
    TMP_DEST[383:320] <-  (TMP_SRC[511:256] >> (IMM8[3:2] * 64))[63:0];
    TMP_DEST[447:384] <-  (TMP_SRC[511:256] >> (IMM8[5:4] * 64))[63:0];
    TMP_DEST[511:448] <-  (TMP_SRC[511:256] >> (IMM8[7:6] * 64))[63:0];
FI;
FOR j <-  0 TO KL-1
    i <-  j * 64
    IF k1[j] OR *no writemask*
          THEN DEST[i+63:i] <-  TMP_DEST[i+63:i]
          ELSE 
                IF *merging-masking* ; merging-masking
                      THEN *DEST[i+63:i] remains unchanged*
                      ELSE  ; zeroing-masking
                            DEST[i+63:i] <-  0 ;zeroing-masking
                FI;
    FI;
ENDFOR
DEST[MAX_VL-1:VL] <-!= 0

VPERMQ (EVEX - vector control forms)

(KL, VL) = (4, 256), (8, 512)
FOR j <-  0 TO KL-1
    i <-  j * 64
    IF (EVEX.b = 1) AND (SRC2 *is memory*)
          THEN TMP_SRC2[i+63:i] <-  SRC2[63:0];
          ELSE TMP_SRC2[i+63:i] <-  SRC2[i+63:i];
    FI;
ENDFOR;
IF VL = 256
    TMP_DEST[63:0] <-  (TMP_SRC2[255:0] >> (SRC1[1:0] * 64))[63:0];
    TMP_DEST[127:64] <-  (TMP_SRC2[255:0] >> (SRC1[65:64] * 64))[63:0];
    TMP_DEST[191:128] <-  (TMP_SRC2[255:0] >> (SRC1[129:128] * 64))[63:0];
    TMP_DEST[255:192] <-  (TMP_SRC2[255:0] >> (SRC1[193:192] * 64))[63:0];
FI;
IF VL = 512
    TMP_DEST[63:0] <-  (TMP_SRC2[511:0] >> (SRC1[2:0] * 64))[63:0];
    TMP_DEST[127:64] <-  (TMP_SRC2[511:0] >> (SRC1[66:64] * 64))[63:0];
    TMP_DEST[191:128] <-  (TMP_SRC2[511:0] >> (SRC1[130:128] * 64))[63:0];
    TMP_DEST[255:192] <-  (TMP_SRC2[511:0] >> (SRC1[194:192] * 64))[63:0];
TMP_DEST[319:256] <-  (TMP_SRC2[511:0] >> (SRC1[258:256] * 64))[63:0];
    TMP_DEST[383:320] <-  (TMP_SRC2[511:0] >> (SRC1[322:320] * 64))[63:0];
    TMP_DEST[447:384] <-  (TMP_SRC2[511:0] >> (SRC1[386:384] * 64))[63:0];
    TMP_DEST[511:448] <-  (TMP_SRC2[511:0] >> (SRC1[450:448] * 64))[63:0];
FI;
FOR j <-  0 TO KL-1
    i <-  j * 64
    IF k1[j] OR *no writemask*
          THEN DEST[i+63:i] <-  TMP_DEST[i+63:i]
          ELSE 
                IF *merging-masking* ; merging-masking
                      THEN *DEST[i+63:i] remains unchanged*
                      ELSE  ; zeroing-masking
                            DEST[i+63:i] <-  0 ;zeroing-masking
                FI;
    FI;
ENDFOR
DEST[MAX_VL-1:VL] <-!= 0

VPERMQ (VEX.256 encoded version)

DEST[63:0] <- (SRC[255:0] >> (IMM8[1:0] * 64))[63:0];
DEST[127:64] <- (SRC[255:0] >> (IMM8[3:2] * 64))[63:0];
DEST[191:128] <- (SRC[255:0] >> (IMM8[5:4] * 64))[63:0];
DEST[255:192] <- (SRC[255:0] >> (IMM8[7:6] * 64))[63:0];
DEST[MAX_VL-1:256] <-!= 0

Intel C/C++ Compiler Intrinsic Equivalent

VPERMQ __m512i _mm512_permutex_epi64(__m512i a, int imm);
VPERMQ __m512i _mm512_mask_permutex_epi64(__m512i s, __mmask8 k, __m512i a,
                                          int imm);
VPERMQ __m512i _mm512_maskz_permutex_epi64(__mmask8 k, __m512i a, int imm);
VPERMQ __m512i _mm512_permutexvar_epi64(__m512i a, __m512i b);
VPERMQ __m512i _mm512_mask_permutexvar_epi64(__m512i s, __mmask8 k, __m512i a,
                                             __m512i b);
VPERMQ __m512i _mm512_maskz_permutexvar_epi64(__mmask8 k, __m512i a, __m512i b);
VPERMQ __m256i _mm256_permutex_epi64(__m256i a, int imm);
VPERMQ __m256i _mm256_mask_permutex_epi64(__m256i s, __mmask8 k, __m256i a,
                                          int imm);
VPERMQ __m256i _mm256_maskz_permutex_epi64(__mmask8 k, __m256i a, int imm);
VPERMQ __m256i _mm256_permutexvar_epi64(__m256i a, __m256i b);
VPERMQ __m256i _mm256_mask_permutexvar_epi64(__m256i s, __mmask8 k, __m256i a,
                                             __m256i b);
VPERMQ __m256i _mm256_maskz_permutexvar_epi64(__mmask8 k, __m256i a, __m256i b);

SIMD Floating-Point Exceptions

None

Other Exceptions

Non-EVEX-encoded instruction, see Exceptions Type 4; additionally

#UD If VEX.L = 0.

If VEX.vvvv != 1111B.

EVEX-encoded instruction, see Exceptions Type E4NF.

#UD If encoded with EVEX.128.

If EVEX.vvvv != 1111B and with imm8.

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