/usr/share/doc/nasm/examples/gather.asm is in nasm 2.10.09-1ubuntu0.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | bits 64
VGATHERQPS xmm1, [xmm0 + rsi], xmm2 ; OK
VGATHERQPS xmm1, [ymm0 + rsi], xmm2 ; fail: error: invalid effective address
VGATHERDPD ymm1, [xmm0 + rsi], ymm2 ; OK
VGATHERDPD xmm1, [xmm0 + rsi], xmm2 ; OK
VGATHERQPD xmm1, [xmm0 + rsi], xmm2 ; OK
VGATHERQPD ymm1, [ymm0 + rsi], ymm2 ; OK
VPGATHERQD xmm1, [xmm0 + rsi], xmm2 ; OK
VPGATHERQD xmm1, [ymm0 + rsi], xmm2 ; fail: error: invalid effective address
VPGATHERDQ ymm1, [xmm0 + rsi], ymm2 ; OK
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