Opened on 12/09/14 at 10:07:33

Closed on 01/23/17 at 14:55:31

Last modified on 11/09/17 at 06:27:14

#2213 closed defect (fixed)

Decreased performance for whetstone benchmark using GCC >=4.5

Reported by: daniel.cederman Owned by: Daniel Hellstrom
Priority: normal Milestone: 5.1
Component: tool/gcc Version:
Severity: normal Keywords:
Cc: Blocked By:
Blocking:

Description

Moving from GCC 4.4.2 to 4.9.2 increases the execution time of the whetstone benchmark on both SPARC and x86. The cause seems to be a single commit. I have submitted a bug report to the GCC bugzilla:

​https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64193

Change History (10)

comment:1 Changed on 01/22/15 at 15:15:04 by Joel Sherrill

Daniel.. did this get resolved? I recall discussions.

comment:2 Changed on 01/23/15 at 09:43:41 by daniel.cederman

Richard Biener provided a patch that fixed it on trunk. It looks like it could be easy to backport, but I have not had time to test it yet.

comment:3 Changed on 03/02/15 at 20:48:06 by Gedare Bloom

Milestone: 4.11 → 4.11.1

comment:4 Changed on 01/23/17 at 13:47:53 by Sebastian Huber

Owner: set to Needs Funding
Status: new → assigned

How is the performance on GCC 6 or 7?

comment:5 Changed on 01/23/17 at 13:48:08 by Sebastian Huber

Owner: changed from Needs Funding to Daniel Hellstrom

comment:6 Changed on 01/23/17 at 14:53:23 by daniel.cederman

A quick test shows that the performance for GCC 7 is about the same as for GCC 4.4.6.

GCC 4.4.6 => ~52 seconds
GCC 4.9.4 => ~55 seconds
GCC 7.0.0 (master at 20170116) => ~52 seconds
Compiled with -O3 and -mcpu=leon3.

comment:7 Changed on 01/23/17 at 14:55:31 by Sebastian Huber

Milestone: 4.11.1 → 4.12
Resolution: → fixed
Status: assigned → closed

Fixed in RTEMS 4.12, no plans to fix this in RTEMS 4.11.

Last edited on 01/23/17 at 14:55:44 by Sebastian Huber (previous) (diff)

comment:8 Changed on 05/11/17 at 07:31:02 by Sebastian Huber

Milestone: 4.12 → 4.12.0

comment:9 Changed on 10/10/17 at 05:58:26 by Sebastian Huber

Component: GCC → tool/gcc

comment:10 Changed on 11/09/17 at 06:27:14 by Sebastian Huber

Milestone: 4.12.0 → 5.1

Milestone renamed

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