On Sun, 2006-12-24 at 09:08 +0100, Zdenek Dvorak wrote: > > As expected, more complications than I believed appeared. The changes > to bsi_remove and release_defs would be basically sufficient for ssa > names for real operands, however we are losing ssa names for virtual > operands everywhere, and on several places relying on that they are not > released. > > One problem with the patch seems to be that it appears to increase > compile times significantly (by some 4% on compiling preprocessed gcc > sources), I did not investigate where does this slowdown come from. If the slowdown was with an ENABLE_CHECKING compiler, then the extra walk over the BBs and statements and the operands within the statements could be a significant hunk.
Finding a way to mark the names as part of an existing walk in the verification step might help siginificantly. I already approved a hunk of this patch that Robert submitted separately. jeff
