On Feb 27, 2008, Kenneth Zadeck <[EMAIL PROTECTED]> wrote: > The appeal for birthpoints is that unlike the abortive attempt in > the past to add SSA to RTL, adding a noop moves does not really mess > up anything.
IIRC, when people tried to do RTL SSA, the problem was with match_dups in IN/OUT operands. I think there's a relatively simple way to deal with this: an RTL form that takes two operands, one for input, one for output, that would represent the SSA names for input and output that must be coalesced to the same variable when going out of SSA, say, during register allocation. Has something like this been considered before? -- Alexandre Oliva http://www.lsd.ic.unicamp.br/~oliva/ FSF Latin America Board Member http://www.fsfla.org/ Red Hat Compiler Engineer [EMAIL PROTECTED], gcc.gnu.org} Free Software Evangelist [EMAIL PROTECTED], gnu.org}
