VGATHERPF1DPS, VGATHERPF1QPS, VGATHERPF1DPD, VGATHERPF1QPDs (Intel x86/64 assembly instruction)

모두의 코드
VGATHERPF1DPS, VGATHERPF1QPS, VGATHERPF1DPD, VGATHERPF1QPDs (Intel x86/64 assembly instruction)

작성일 : 2020-09-01 이 글은 592 번 읽혔습니다.

VGATHERPF1DPS, VGATHERPF1QPS, VGATHERPF1DPD, VGATHERPF1QPD

Sparse Prefetch Packed SP/DP Data Values with Signed Dword, Signed Qword Indices Using T1 Hint

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
`EVEX.512.66.0F38.W0 C6 /2 /vsib` VGATHERPF1DPS vm32z {k1}	T1S	V/V	AVX512PF	Using signed dword indices, prefetch sparse byte memory locations containing single-precision data using opmask k1 and T1 hint.
`EVEX.512.66.0F38.W0 C7 /2 /vsib` VGATHERPF1QPS vm64z {k1}	T1S	V/V	AVX512PF	Using signed qword indices, prefetch sparse byte memory locations containing single-precision data using opmask k1 and T1 hint.
`EVEX.512.66.0F38.W1 C6 /2 /vsib` VGATHERPF1DPD vm32y {k1}	T1S	V/V	AVX512PF	Using signed dword indices, prefetch sparse byte memory locations containing double-precision data using opmask k1 and T1 hint.
`EVEX.512.66.0F38.W1 C7 /2 /vsib` VGATHERPF1QPD vm64z {k1}	T1S	V/V	AVX512PF	Using signed qword indices, prefetch sparse byte memory locations containing double-precision data using opmask k1 and T1 hint.

Instruction Operand Encoding

Op/En	Operand 1	Operand 2	Operand 3	Operand 4
T1S	BaseReg (R): VSIB:base,VectorReg(R): VSIB:index	NA	NA	NA

Description

The instruction conditionally prefetches up to sixteen 32-bit or eight 64-bit integer byte data elements. The elements are specified via the VSIB (i.e., the index register is an zmm, holding packed indices). Elements will only be prefetched if their corresponding mask bit is one.

Lines prefetched are loaded into to a location in the cache hierarchy specified by a locality hint (T1):

T1 (temporal data)--prefetch data into the second level cache.

[PS data] For dword indices, the instruction will prefetch sixteen memory locations. For qword indices, the instruc-tion will prefetch eight values.

[PD data] For dword and qword indices, the instruction will prefetch eight memory locations.

Note that:

(1) The prefetches may happen in any order (or not at all). The instruction is a hint.

(2) The mask is left unchanged.

(3) Not valid with 16-bit effective addresses. Will deliver a #UD fault.

(4) No FP nor memory faults may be produced by this instruction.

(5) Prefetches do not handle cache line splits

(6) A #UD is signaled if the memory operand is encoded without the SIB byte.

Operation

VGATHERPF1DPS (EVEX encoded version)

(KL, VL) = (16, 512)
FOR j <-  0 TO KL-1
    i <-  j * 32
    IF k1[j] 
          Prefetch( [BASE_ADDR + SignExtend(VINDEX[i+31:i]) * SCALE + DISP], Level=1, RFO = 0)
    FI;
ENDFOR

VGATHERPF1DPD (EVEX encoded version)

(KL, VL) = (8, 512)
FOR j <-  0 TO KL-1
    i <-  j * 64
    k <-  j * 32
    IF k1[j] 
          Prefetch( [BASE_ADDR + SignExtend(VINDEX[k+31:k]) * SCALE + DISP], Level=1, RFO = 0)
    FI;
ENDFOR

VGATHERPF1QPS (EVEX encoded version)

(KL, VL) = (8, 256)
FOR j <-  0 TO KL-1
    i <-  j * 64
    IF k1[j] 
          Prefetch( [BASE_ADDR + SignExtend(VINDEX[i+63:i]) * SCALE + DISP], Level=1, RFO = 0)
    FI;
ENDFOR

VGATHERPF1QPD (EVEX encoded version)

(KL, VL) = (8, 512)
FOR j <-  0 TO KL-1
    i <-  j * 64
    k <-  j * 64
    IF k1[j] 
          Prefetch( [BASE_ADDR + SignExtend(VINDEX[k+63:k]) * SCALE + DISP], Level=1, RFO = 0)
    FI;
ENDFOR

Intel C/C++ Compiler Intrinsic Equivalent

VGATHERPF1DPD void _mm512_mask_prefetch_i32gather_pd(__m256i vdx, __mmask8 m,
                                                     void* base, int scale,
                                                     int hint);
VGATHERPF1DPS void _mm512_mask_prefetch_i32gather_ps(__m512i vdx, __mmask16 m,
                                                     void* base, int scale,
                                                     int hint);
VGATHERPF1QPD void _mm512_mask_prefetch_i64gather_pd(__m512i vdx, __mmask8 m,
                                                     void* base, int scale,
                                                     int hint);
VGATHERPF1QPS void _mm512_mask_prefetch_i64gather_ps(__m512i vdx, __mmask8 m,
                                                     void* base, int scale,
                                                     int hint);

SIMD Floating-Point Exceptions

None

Other Exceptions

See Exceptions Type E12NP.

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모두의 코드 VGATHERPF1DPS, VGATHERPF1QPS, VGATHERPF1DPD, VGATHERPF1QPDs (Intel x86/64 assembly instruction)