···1+diff --git a/m4/cpu-check.m4 b/m4/cpu-check.m4
2+index 3cf0a7f08..12bb926ac 100644
3+--- a/m4/cpu-check.m4
4++++ b/m4/cpu-check.m4
5+@@ -37,6 +37,18 @@ if test "$ac_cv_singcpuname" = ppc; then
6+ AC_DEFINE(SI_CPU_PPC,1,"PPC")
7+ AC_SUBST(SI_CPU_PPC)
8+ fi
9++if test "$ac_cv_singcpuname" = arm -o "$ac_cv_singcpuname" = armel; then
10++ AC_DEFINE(SI_CPU_ARM,1,"ARM")
11++ AC_SUBST(SI_CPU_ARM)
12++fi
13++if test "$ac_cv_singcpuname" = aarch64; then
14++ AC_DEFINE(SI_CPU_AARCH64,1,"AARCH64")
15++ AC_SUBST(SI_CPU_AARCH64)
16++fi
17++if test "$ac_cv_singcpuname" = s390; then
18++ AC_DEFINE(SI_CPU_S390,1,"S390")
19++ AC_SUBST(SI_CPU_S390)
20++fi
21+22+ # UNAME and PATH
23+ AC_MSG_CHECKING(uname for Singular)
24+@@ -65,6 +77,14 @@ dnl testet on: ppc_Linux, 740/750 PowerMac G3, 512k L2 cache
25+ [powerpc*|ppc*], [AC_DEFINE(HAVE_GENERIC_MULT,1,multiplication is fast on the cpu: a*b is with mod otherwise using tables of logartihms)],
26+ dnl the following settings seems to be better on arm processors
27+ [arm*], [],
28++dnl FIXME: need to run some tests
29++ [aarch64*], [
30++ AC_DEFINE(HAVE_MULT_MOD,1,multiplication is fast on the cpu: a*b is with mod otherwise using tables of logartihms)
31++ AC_DEFINE(HAVE_GENERIC_ADD,1,use branch for addition in Z/p otherwise it uses a generic add)
32++ AC_DEFINE(HAVE_DIV_MOD,1,division using extend euclidian algorithm otherwise using tables of logartihms)
33++ ],
34++dnl FIXME: need to run some tests
35++ [s390*], [AC_DEFINE(HAVE_GENERIC_ADD,1,use branch for addition in Z/p otherwise it uses a generic add)],
36+ []
37+ )
38+