------- Comment #12 from ubizjak at gmail dot com 2009-02-09 22:43 ------- (In reply to comment #11) > Uros, how hard to support this in x86 backend?
I remember there were concerns when xmm0 single-register constraint was introduced... We need new constraint letter and new regclass entry. I don't have relevant mail at hand, but IIRC adding new register class is O(n*n). OTOH, constraints should be used to support correct register allocation for machine instructions, not to emulate ABI in order to support calls from inside asm statements. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16331
