On Sun, Mar 29, 2015 at 11:58 AM, Matthias Schwarzott <z...@gentoo.org> wrote:
> Hi there!
>
> I updated my ~amd64 system recently to new hardware (Intel Core i3-4160).
> Since then valgrind did no longer work for 32bit programs because
> "-march=native" did choose instructions that valgrind does not support
> in 32bit mode (even ld.so was unusable).
>
> After some research I put this into make.conf and now it works:
> CFLAGS_x86="${CFLAGS_x86} -mno-avx2 -mno-sse4 -mno-bmi -mno-bmi2"
> CXXFLAGS_x86="${CXXFLAGS_x86} -mno-avx2 -mno-sse4 -mno-bmi -mno-bmi2"
>
> Is this the best solution to the problem?
> If yes, the valgrind ebuild could suggest something like this.
> Either always show it or check cpu-flags first (is this maintainable?).Valgrind's policy is that they don't implement new instruction sets in 32-bit. Doing what you've done is the only option I'm aware of, short of implementing support in valgrind for these instructions.
