https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89021
H.J. Lu <hjl.tools at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2019-01-24 Ever confirmed|0 |1 --- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to Richard Biener from comment #2) > I think that to avoid surprises -mno-mmx should be the default on x86 and > thus > MMX code would need to explicitely supply -mmmx. Would that work around the > issue or would we see odd errors when using the mm intrinsics? That sounds right. We can even vectorize void foo (char* restrict r, char* restrict a){ for (int i = 0; i < 8; i++){ r[i] += a[i]; } }