http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50101
--- Comment #9 from Jeffrey A. Law <law at redhat dot com> 2011-08-19 15:35:36 UTC --- -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 08/19/11 08:05, meissner at linux dot vnet.ibm.com wrote: > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50101 > > --- Comment #8 from Michael Meissner <meissner at linux dot > vnet.ibm.com> 2011-08-19 14:05:51 UTC --- On Thu, Aug 18, 2011 at > 08:58:28AM +0000, rguenth at gcc dot gnu.org wrote: >> Did you try pessimizing the non-ctr reg alternatives (and the >> memory alternative even more)? Like adding ! to the non-ctr >> alternatives and ? to the memory one? Not sure if those markers >> are looked at by IRA though. > > Yes, I should have mentioned that I tried various combinations of ?, > !, and * and the combinations I tried aborted. I've certainly > suspected that IRA now longer looks at !, ?, and * like the previous > register allocator did previously. It may be that it is special due > to being a JUMP_INSN. I wonder if we could record which allocnos correspond to outputs of JUMP_INSNS, then in the allocno sorting code, move all of them to the front of the list. In effect, this makes those allocnos have higher priority for getting a hard reg than everything else. Thoughts? Jeff -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJOToKzAAoJEBRtltQi2kC761UIAK4E0qfQ174Zakhd3JpDuLZ5 teyBgLTnoNMmO1pIdY/SgDP39PvtG9zwFoUwUDljDfZNbwVEHr2EmFgdu6RzmEAM H6NvI40PPKvN9YIY4hkT007OWKatXU2IrXnHij0ZoEIktobLbC38vz6JHTfNDJkW Bl9MKBeVfvMma7yzEZ2tgIXwy16SNuebHJuU6718uooMMwZ2agDWad9CsPvVGRtj yzuvUQH3qg/ZdCfCfHKF+0hKzLe/1S4XNBt8X8Ezj582CR8irDzOngGQkagDvpTz DXwGKDKBUjMAO3VYEw6GYWbfyxsnv1VFaXezNj/9/QpVKswvRi5vtHhii3LYzlY= =vmEo -----END PGP SIGNATURE-----
