On Mon, Dec 13, 2021 at 2:04 PM Florian Weimer <fweimer@xxxxxxxxxx> wrote: > > * Manuel Lauss via Gcc-help: > > > Now the descriptions of "vmovdqa" I could find say that it generates a > > #GP when the destination is not 16-byte aligned. Does this alignment > > include the displacement, like above? If yes, is this then a code > > generation bug in gcc? > > If your build uses vector instructions, you need to build glibc with > -mstackrealign for compatibility with legacy i386 applications. I read that gcc-12 enables "-ftree-vectorize" with -O2 by default, and indeed a glibc snapshot built with gcc-12 and "-O2 -march=haswell" suffers now from the same problem. Should "-mstackrealign" be added to 32bit x86 build unconditionally? Manuel
