{ name => "zero", type => 4+2 }, # always zero
{ name => "at", type => 4 }, # reserved for assembler
{ name => "v0", type => 1 }, # first return value
{ name => "zero", type => 4+2 }, # always zero
{ name => "at", type => 4 }, # reserved for assembler
{ name => "v0", type => 1 }, # first return value