diff --git a/m4/ax_gcc_archflag.m4 b/m4/ax_gcc_archflag.m4
index 2754d8a40d912e2674719cea5e1338c6ab0dd693..342396d6bbd2f79bdc916315a5233e54e8d5d44f 100644
--- a/m4/ax_gcc_archflag.m4
+++ b/m4/ax_gcc_archflag.m4
@@ -147,6 +147,8 @@ case $host_cpu in
 	    *06??f??:*:*:*|6??f??:*:*:*) ax_gcc_arch="bdver3 bdver2 bdver1 amdfam10 k8" ;;
 	    *070?f??:*:*:*|70?f??:*:*:*) ax_gcc_arch="btver2 btver1 amdfam10 k8" ;;
                            83?f??:*:*:*) ax_gcc_arch="znver2 znver1 btver2 btver1 amdfam10 k8" ;;
+                           a0?f??:*:*:*) ax_gcc_arch="znver3 znver2 znver1 btver2 btver1 amdfam10 k8" ;;
+                           a1?f??:*:*:*) ax_gcc_arch="znver4 znver3 znver2 znver1 btver2 btver1 amdfam10 k8" ;;
 	    *???f??:*:*:*) ax_gcc_arch="amdfam10 k8" ;;
           esac ;;
 	*:746e6543:736c7561:48727561) # IDT / VIA (Centaur)