[solved] Problem with VPMOVMSKB AVX2 instruction

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bdlepla

Joined: 05 Sep 2023
Posts: 4

bdlepla 09 Sep 2023, 15:02

Code snippet I'm assembling with flat assembler version g.k4v8

Code:

    vmovdqu     ymm1,[rsi+rdx]
    vpcmpeqb    ymm1,ymm1,[rdi+rdx]
    vpmovmskb   rax,ymm1

Code disassembled with ndisasm:

Code:

0000025D  C5FE6F0C16        vmovqqu ymm1,yword [rsi+rdx]
00000262  C5F5740C17        vpcmpeqb ymm1,ymm1,yword [rdi+rdx]
00000267  C5FDD7C1          vpmovmskb eax,ymm1 ; <-- eax should be rax

Thanks.

09 Sep 2023, 15:02

bdlepla

Joined: 05 Sep 2023
Posts: 4

bdlepla 09 Sep 2023, 15:12

Never mind. This is my bad. Eax is proper because it supports ymm1 32 bytes to 32 bits.

09 Sep 2023, 15:12

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