How to find out what mode Solaris can use on your hardware 64 or 32?

isainfo -v or isainfo -b:

64-bit amd64 applications
ssse3 cx16 sse3 sse2 sse fxsr mmx cmov amd_sysc cx8 tsc fpu
32-bit i386 applications
ssse3 cx16 sse3 sse2 sse fxsr mmx cmov sep cx8 tsc fpu