[Nasm-devel] VSIB operand memory access size specifier

[Song, J. K. <jin...@in...>]

I found one discrepancy between NASM and gas regarding the size specifier.
In insns.dat, VGATHERQPD/DPD expects 64bits(QWORD), if specified, specifier for VSIB operand.
	NASM : VGATHERQPD      xmmreg,xmem64,xmmreg            [rmv:   vm64x vex.dds.128.66.0f38.w1 93 /r]     FUTURE,AVX2
		 VGATHERDPD       zmmreg|mask,ymem64             [rm:t1s:  vsiby evex.512.66.0f38.w1 92 /r ]  AVX512,FUTURE
But gas thinks it is a ZWORD.
	Gas  : vgatherdpd      zmm30{k1}, ZMMWORD PTR [r14+ymm31*8-123]

I think NASM way makes more sense because each data element size is 64bits(QWORD) not ZWORD. But it is also true that the eventual data size gathered is up to ZWORD.
Is this discrepancy made intentionally? Does it need to be fixed to conform with gas or just to stay same as it used to be?

- Jin