public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
* [Bug target/48974] New: VIS intrinsics improvement opportunities @ 2011-05-12 5:35 hp at gcc dot gnu.org 2011-05-12 5:35 ` [Bug target/48974] " hp at gcc dot gnu.org ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: hp at gcc dot gnu.org @ 2011-05-12 5:35 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48974 Summary: VIS intrinsics improvement opportunities Product: gcc Version: 4.7.0 Status: UNCONFIRMED Keywords: missed-optimization Severity: enhancement Priority: P3 Component: target AssignedTo: unassigned@gcc.gnu.org ReportedBy: hp@gcc.gnu.org Target: sparc64-*-* While writing a VIS backend for RAPP, http://savannah.nongnu.org/projects/rapp/ using gcc54 at the compilefarm I noticed a few omissions and opportunities for improvements. I just thought adding some notes here would be better than nothing, before I forget. 1. The insns fone / fones are unused (in contrast to fzero / fzeros). 2. The implicit dependency on the GSR control register from the fpack* and faligndata insns aren't expressed in the intrinsics. There's also no way to set GSR other than through an asm (or by __builtin_vis_alignaddr, for the side-effect of setting the GSR.alignaddr_offset field). This makes those intrinsics next to useless compared to naked asms. An intuitive way to set GSR for those intrinsics would be as a parameter to the fpack* and faligndata intrinsics (or rather, new variants), and generating a CSE:able setting of GSR when expanding the intrinsic (and changing the __builtin_vis_alignaddr to be a parallel, setting the same pseudo or just clobbering it). See the initial-value machinery and its use in various ports for managing a suitable pseudo for a hard-register; get_hard_reg_initial_val and friends. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/48974] VIS intrinsics improvement opportunities 2011-05-12 5:35 [Bug target/48974] New: VIS intrinsics improvement opportunities hp at gcc dot gnu.org @ 2011-05-12 5:35 ` hp at gcc dot gnu.org 2011-09-22 5:23 ` hp at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: hp at gcc dot gnu.org @ 2011-05-12 5:35 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48974 Hans-Peter Nilsson <hp at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2011.05.12 05:19:49 Ever Confirmed|0 |1 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/48974] VIS intrinsics improvement opportunities 2011-05-12 5:35 [Bug target/48974] New: VIS intrinsics improvement opportunities hp at gcc dot gnu.org 2011-05-12 5:35 ` [Bug target/48974] " hp at gcc dot gnu.org @ 2011-09-22 5:23 ` hp at gcc dot gnu.org 2011-09-25 23:37 ` hp at gcc dot gnu.org 2011-09-26 0:48 ` hp at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: hp at gcc dot gnu.org @ 2011-09-22 5:23 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48974 --- Comment #1 from Hans-Peter Nilsson <hp at gcc dot gnu.org> 2011-09-22 01:25:13 UTC --- For an example of working around (2), see <http://git.savannah.gnu.org/cgit/rapp.git/tree/compute/backend/rc_vec_vis.h>. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/48974] VIS intrinsics improvement opportunities 2011-05-12 5:35 [Bug target/48974] New: VIS intrinsics improvement opportunities hp at gcc dot gnu.org 2011-05-12 5:35 ` [Bug target/48974] " hp at gcc dot gnu.org 2011-09-22 5:23 ` hp at gcc dot gnu.org @ 2011-09-25 23:37 ` hp at gcc dot gnu.org 2011-09-26 0:48 ` hp at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: hp at gcc dot gnu.org @ 2011-09-25 23:37 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48974 Hans-Peter Nilsson <hp at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |FIXED --- Comment #2 from Hans-Peter Nilsson <hp at gcc dot gnu.org> 2011-09-25 22:21:07 UTC --- Both issues fixed in 4.7 as of r179173. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/48974] VIS intrinsics improvement opportunities 2011-05-12 5:35 [Bug target/48974] New: VIS intrinsics improvement opportunities hp at gcc dot gnu.org ` (2 preceding siblings ...) 2011-09-25 23:37 ` hp at gcc dot gnu.org @ 2011-09-26 0:48 ` hp at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: hp at gcc dot gnu.org @ 2011-09-26 0:48 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48974 Hans-Peter Nilsson <hp at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |4.7.0 ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2011-09-25 22:36 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2011-05-12 5:35 [Bug target/48974] New: VIS intrinsics improvement opportunities hp at gcc dot gnu.org 2011-05-12 5:35 ` [Bug target/48974] " hp at gcc dot gnu.org 2011-09-22 5:23 ` hp at gcc dot gnu.org 2011-09-25 23:37 ` hp at gcc dot gnu.org 2011-09-26 0:48 ` hp at gcc dot gnu.org
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).