VGATHERDPS/VGATHERDPD—Gather Packed Single, Packed Double with Signed Dword

Instruction Operand Encoding

Description

A set of single-precision/double-precision faulting-point memory locations pointed by base address BASE_ADDR and index vector V_INDEX with scale SCALE are gathered. The result is written into a vector register. The elements are specified via the VSIB (i.e., the index register is a vector register, holding packed indices). Elements will only be loaded if their corresponding mask bit is one. If an element’s mask bit is not set, the corresponding element of the destination register is left unchanged. The entire mask register will be set to zero by this instruction unless it triggers an exception.

This instruction can be suspended by an exception if at least one element is already gathered (i.e., if the exception is triggered by an element other than the right most one with its mask bit set). When this happens, the destination register and the mask register (k1) are partially updated; those elements that have been gathered are placed into the destination register and have their mask bits set to zero. If any traps or interrupts are pending from already gathered elements, they will be delivered in lieu of the exception; in this case, EFLAG.RF is set to one so an instruc-tion breakpoint is not re-triggered when the instruction is continued.

If the data element size is less than the index element size, the higher part of the destination register and the mask register do not correspond to any elements being gathered. This instruction sets those higher parts to zero. It may update these unused elements to one or both of those registers even if the instruction triggers an exception, and even if the instruction triggers the exception before gathering any elements.

Note that:

closer to the MSB may or may not be completed. If a given element triggers multiple faults, they are delivered in the conventional order.

Note that the presence of VSIB byte is enforced in this instruction. Hence, the instruction will #UD fault if ModRM.rm is different than 100b.

This instruction has special disp8*N and alignment rules. N is considered to be the size of a single vector element.

The scaled index may require more bits to represent than the address bits used by the processor (e.g., in 32-bit mode, if the scale is greater than one). In this case, the most significant bits beyond the number of address bits are ignored.

The instruction will #UD fault if the destination vector zmm1 is the same as index vector VINDEX. The instruction will #UD fault if the k0 mask register is specified.

Operation

BASE_ADDR stands for the memory operand base address (a GPR); may not exist

VINDEX stands for the memory operand vector of indices (a vector register)

SCALE stands for the memory operand scalar (1, 2, 4 or 8)

DISP is the optional 1, 2 or 4 byte displacement

VGATHERDPS (EVEX encoded version)

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

FOR j (cid:197) 0 TO KL-1

i (cid:197) j * 32

IF k1[j]

THEN DEST[i+31:i] (cid:197)

MEM[BASE_ADDR +

SignExtend(VINDEX[i+31:i]) * SCALE + DISP]

k1[j] (cid:197) 0

ELSE *DEST[i+31:i] (cid:197) remains unchanged*

FI;

ENDFOR

k1[MAX_KL-1:KL] (cid:197) 0

DEST[MAX_VL-1:VL] (cid:197) 0

VGATHERDPD (EVEX encoded version)

(KL, VL) = (2, 128), (4, 256), (8, 512)

FOR j (cid:197) 0 TO KL-1

i (cid:197) j * 64

k (cid:197) j * 32

IF k1[j]

THEN DEST[i+63:i] (cid:197) MEM[BASE_ADDR +

SignExtend(VINDEX[k+31:k]) * SCALE + DISP]

k1[j] (cid:197) 0

ELSE *DEST[i+63:i] (cid:197) remains unchanged*

FI;

ENDFOR

k1[MAX_KL-1:KL] (cid:197) 0

DEST[MAX_VL-1:VL] (cid:197) 0

Intel C/C++ Compiler Intrinsic Equivalent

VGATHERDPD __m512d _mm512_i32gather_pd( __m256i vdx, void * base, int scale);

VGATHERDPD __m512d _mm512_mask_i32gather_pd(__m512d s, __mmask8 k, __m256i vdx, void * base, int scale);

VGATHERDPD __m256d _mm256_mmask_i32gather_pd(__m256d s, __mmask8 k, __m128i vdx, void * base, int scale);

VGATHERDPD __m128d _mm_mmask_i32gather_pd(__m128d s, __mmask8 k, __m128i vdx, void * base, int scale);

VGATHERDPS __m512 _mm512_i32gather_ps( __m512i vdx, void * base, int scale);

VGATHERDPS __m512 _mm512_mask_i32gather_ps(__m512 s, __mmask16 k, __m512i vdx, void * base, int scale);

VGATHERDPS __m256 _mm256_mmask_i32gather_ps(__m256 s, __mmask8 k, __m256i vdx, void * base, int scale);

GATHERDPS __m128 _mm_mmask_i32gather_ps(__m128 s, __mmask8 k, __m128i vdx, void * base, int scale);

SIMD Floating-Point Exceptions

None

Other Exceptions

See Exceptions Type E12.