On Tue, Apr 29, 2025 at 12:41 PM H.J. Lu <hjl.to...@gmail.com> wrote: > > On Tue, Apr 29, 2025 at 5:52 PM Uros Bizjak <ubiz...@gmail.com> wrote: > > > > MOVS instructions allow segment override of their source operand, e.g.: > > > > rep movsq %gs:(%rsi), (%rdi) > > > > where %rsi is the address of the source location (with %gs segment override) > > and %rdi is the address of the destination location. > > Please be aware that 0x67 prefix (used by x32) is applied before segment > register. That is in > > rep movsq %gs:(%esi), (%edi) > > the address is %gs + %esi.
Uh, yes, now I remember this x32 peculiarity. So, we want the segment prefix disabled with "-mx32 -maddress-mode=short" ? Thanks, Uros.
