25 May
2019
25 May
'19
7:22 a.m.
On Sat, 25 May 2019 at 04:27, Filipe Laíns via arch-dev-public <arch-dev-public@archlinux.org> wrote:
Setting `-mtune` to generic won't add any additional instruction sets by itself, but it does not prevent instruction sets from being added. Looks like GCC enables MMX, SSE and SSE2 by default, it isn't related at all to `-march` like I stated in the email but it still presents the same issue.
As far as I know, MMX, SSE and SSE2 are mandatory part of the AMD64 instruction set, so they are not enabled randomly just because someone felt like it, but because they are be present on every x86_64 cpu.