------- Comment #13 from d at teklibre dot com 2009-04-22 17:55 ------- @Andrew >I suspect the reason the limit is 30 is that when that code was written the >largest register set was 32 registers, 2 of which were reserved to the >implementation. Inline asm hasn't kept up with the hardware.
That old huh? Given that I/O operands take two virtual regs... methinks that the history of this is more of an x86ism... and symbolic register parameters date back to gcc 3.1.... -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39847
