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* [Bug ipa/63416] New: Three calls to empty functions via pointers get folded, but not inlined
@ 2014-09-30 15:33 felix.shvaiger at emc dot com
2014-09-30 15:36 ` [Bug ipa/63416] " felix.shvaiger at emc dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: felix.shvaiger at emc dot com @ 2014-09-30 15:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63416
Bug ID: 63416
Summary: Three calls to empty functions via pointers get
folded, but not inlined
Product: gcc
Version: 4.7.4
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ipa
Assignee: unassigned at gcc dot gnu.org
Reporter: felix.shvaiger at emc dot com
Created attachment 33620
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33620&action=edit
3 function calls -> folded, not inlined
Missed inlining opportunity.
Issue exists in x86 arch.
4.7, 4.8, 4.9, 5.0 versions (maybe earlier too).
Option: -O2, -O3
If 2 near-empty functions called via pointers, then calls get folded and
inlined.
If 3rd empty function call via pointer added, then all calls get folded, but
not inlined.
Attached test cases (self-contained, no includes):
a1.c -- 3 function calls -> folded, not inlined.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug ipa/63416] Three calls to empty functions via pointers get folded, but not inlined
2014-09-30 15:33 [Bug ipa/63416] New: Three calls to empty functions via pointers get folded, but not inlined felix.shvaiger at emc dot com
@ 2014-09-30 15:36 ` felix.shvaiger at emc dot com
2014-09-30 15:39 ` felix.shvaiger at emc dot com
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: felix.shvaiger at emc dot com @ 2014-09-30 15:36 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63416
--- Comment #1 from Felix Shvaiger <felix.shvaiger at emc dot com> ---
Created attachment 33621
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33621&action=edit
2 function calls -> (for comparison) folded, inlined
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug ipa/63416] Three calls to empty functions via pointers get folded, but not inlined
2014-09-30 15:33 [Bug ipa/63416] New: Three calls to empty functions via pointers get folded, but not inlined felix.shvaiger at emc dot com
2014-09-30 15:36 ` [Bug ipa/63416] " felix.shvaiger at emc dot com
@ 2014-09-30 15:39 ` felix.shvaiger at emc dot com
2014-09-30 15:40 ` felix.shvaiger at emc dot com
2014-10-01 14:39 ` rguenth at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: felix.shvaiger at emc dot com @ 2014-09-30 15:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63416
--- Comment #2 from Felix Shvaiger <felix.shvaiger at emc dot com> ---
Created attachment 33622
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33622&action=edit
disassembly of compiled a1.c -- bad code
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug ipa/63416] Three calls to empty functions via pointers get folded, but not inlined
2014-09-30 15:33 [Bug ipa/63416] New: Three calls to empty functions via pointers get folded, but not inlined felix.shvaiger at emc dot com
2014-09-30 15:36 ` [Bug ipa/63416] " felix.shvaiger at emc dot com
2014-09-30 15:39 ` felix.shvaiger at emc dot com
@ 2014-09-30 15:40 ` felix.shvaiger at emc dot com
2014-10-01 14:39 ` rguenth at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: felix.shvaiger at emc dot com @ 2014-09-30 15:40 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63416
--- Comment #3 from Felix Shvaiger <felix.shvaiger at emc dot com> ---
Created attachment 33623
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33623&action=edit
disassembly of compiled a2.c -- good code
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug ipa/63416] Three calls to empty functions via pointers get folded, but not inlined
2014-09-30 15:33 [Bug ipa/63416] New: Three calls to empty functions via pointers get folded, but not inlined felix.shvaiger at emc dot com
` (2 preceding siblings ...)
2014-09-30 15:40 ` felix.shvaiger at emc dot com
@ 2014-10-01 14:39 ` rguenth at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2014-10-01 14:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63416
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
CC| |hubicka at gcc dot gnu.org
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Must be sth wrong with size/time estimates. Honza?
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2014-10-01 14:39 UTC | newest]
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2014-09-30 15:33 [Bug ipa/63416] New: Three calls to empty functions via pointers get folded, but not inlined felix.shvaiger at emc dot com
2014-09-30 15:36 ` [Bug ipa/63416] " felix.shvaiger at emc dot com
2014-09-30 15:39 ` felix.shvaiger at emc dot com
2014-09-30 15:40 ` felix.shvaiger at emc dot com
2014-10-01 14:39 ` rguenth at gcc dot gnu.org
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