https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89165
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- This is warned about: t.c: In function āgā: t.c:7:1: warning: SSE vector return without SSE enabled changes the ABI [-Wpsabi] 7 | simd4f g(simd4f a,simd4f b) {return f(a)+f(b);} | ^~~~~~ t.c:7:8: note: The ABI for passing parameters with 16-byte alignment has changed in GCC 4.6 7 | simd4f g(simd4f a,simd4f b) {return f(a)+f(b);} | ^ t.c:7:8: warning: SSE vector argument without SSE enabled changes the ABI [-Wpsabi]