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VPEXPANDD

Load Sparse Packed Doubleword Integer Values From Dense Memory/Register

stableVMJITAOTinstruction

Encodings

OpcodeInstructionOp/En64-bitCompat/LegacyDescription
EVEX.128.66.0F38.W0 89 /rVPEXPANDD xmm1 {k1}{z}, xmm2/m128AValidValidExpand packed double-word integer values from AVX512F) OR xmm2/m128 to xmm1 using writemask k1. AVX10.1
EVEX.256.66.0F38.W0 89 /rVPEXPANDD ymm1 {k1}{z}, ymm2/m256AValidValidExpand packed double-word integer values from AVX512F) OR ymm2/m256 to ymm1 using writemask k1. AVX10.1
EVEX.512.66.0F38.W0 89 /rVPEXPANDD zmm1 {k1}{z}, zmm2/m512AValidValidExpand packed double-word integer values from OR AVX10.1 zmm2/m512 to zmm1 using writemask k1.

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.

A

  1. modrm.reg 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

Tupla: Tuple1 Scalar

Measured cost

Loading measurements from arch-data...

Description

Expand (load) up to 16 contiguous doubleword integer values of the input vector in the source operand (the second operand) to sparse elements in the destination operand (the first operand), selected by the writemask k1. The destination operand is a ZMM register, the source operand can be a ZMM register or memory location.

The input vector starts from the lowest element in the source operand. The opmask register k1 selects the destination elements (a partial vector or sparse elements if less than 8 elements) to be replaced by the ascending elements in the input vector. Destination elements not selected by the writemask k1 are either unmodified or zeroed, depending on EVEX.z.

Note: EVEX.vvvv is reserved and must be 1111b otherwise instructions will #UD.

Note that the compressed displacement assumes a pre-scaling (N) corresponding to the size of one single element instead of the size of the full vector.

Operation

VPEXPANDD (EVEX encoded versions)

(KL, VL) = (4, 128), (8, 256), (16, 512)

k := 0

FOR j := 0 TO KL-1

i := j * 32

IF k1[j] OR *no writemask*

        THEN

             DEST[i+31:i] := SRC[k+31:k];

             k := k + 32

        ELSE

             IF *merging-masking*             ; merging-masking

                 THEN *DEST[i+31:i] remains unchanged*

                 ELSE                         ; zeroing-masking

                    DEST[i+31:i] := 0

             FI

FI;

ENDFOR

DEST[MAXVL-1:VL] := 0

Intel C/C++ compiler intrinsics

VPEXPANDD __m512i _mm512_mask_expandloadu_epi32(__m512i s, __mmask16 k, void * a);
VPEXPANDD __m512i _mm512_maskz_expandloadu_epi32( __mmask16 k, void * a);
VPEXPANDD __m512i _mm512_mask_expand_epi32(__m512i s, __mmask16 k, __m512i a);
VPEXPANDD __m512i _mm512_maskz_expand_epi32( __mmask16 k, __m512i a);
VPEXPANDD __m256i _mm256_mask_expandloadu_epi32(__m256i s, __mmask8 k, void * a);
VPEXPANDD __m256i _mm256_maskz_expandloadu_epi32( __mmask8 k, void * a);
VPEXPANDD __m256i _mm256_mask_expand_epi32(__m256i s, __mmask8 k, __m256i a);
VPEXPANDD __m256i _mm256_maskz_expand_epi32( __mmask8 k, __m256i a);
VPEXPANDD __m128i _mm_mask_expandloadu_epi32(__m128i s, __mmask8 k, void * a);
VPEXPANDD __m128i _mm_maskz_expandloadu_epi32( __mmask8 k, void * a);
VPEXPANDD __m128i _mm_mask_expand_epi32(__m128i s, __mmask8 k, __m128i a);
VPEXPANDD __m128i _mm_maskz_expand_epi32( __mmask8 k, __m128i a);

SIMD Floating-Point Exceptions

None.

Other Exceptions

EVEX-encoded instruction, see Exceptions Type E4.nb in Table 2-51, "Type E4 Class Exception Conditions."

Additionally: If EVEX.vvvv != 1111B.

#UD

Sources