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* [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
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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
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