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* [Bug driver/94381] New: -falign-function/-falign-labels/-falign-loops documentation is inaccurate
@ 2020-03-28 14:11 hjl.tools at gmail dot com
2020-03-28 14:33 ` [Bug driver/94381] " hjl.tools at gmail dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: hjl.tools at gmail dot com @ 2020-03-28 14:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94381
Bug ID: 94381
Summary: -falign-function/-falign-labels/-falign-loops
documentation is inaccurate
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
CC: crazylht at gmail dot com, skpgkp2 at gmail dot com
Target Milestone: ---
'-falign-functions'
'-falign-functions=N'
'-falign-functions=N:M'
'-falign-functions=N:M:N2'
'-falign-functions=N:M:N2:M2'
Align the start of functions to the next power-of-two greater than
N, skipping up to M-1 bytes.
But
[hjl@gnu-cfl-2 align]$ cat y.i
void
foo (void)
{
}
[hjl@gnu-cfl-2 align]$ gcc -O2 -S -falign-functions=4 y.i
[hjl@gnu-cfl-2 align]$ cat y.s
.file "y.i"
.text
.p2align 2 <<<<<<<< 4 is not the next power-of-two greater than 4.
.globl foo
.type foo, @function
foo:
.LFB0:
.cfi_startproc
ret
.cfi_endproc
.LFE0:
.size foo, .-foo
.ident "GCC: (GNU) 9.3.1 20200317 (Red Hat 9.3.1-1)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-cfl-2 align]$
It should be "the next power-of-two no less than N".
'-falign-labels'
'-falign-labels=N'
'-falign-labels=N:M'
'-falign-labels=N:M:N2'
'-falign-labels=N:M:N2:M2'
Align all branch targets to a power-of-two boundary.
and
'-falign-loops'
'-falign-loops=N'
'-falign-loops=N:M'
'-falign-loops=N:M:N2'
'-falign-loops=N:M:N2:M2'
Align loops to a power-of-two boundary.
may leave an impression of alignment is N to the power-of-two.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug driver/94381] -falign-function/-falign-labels/-falign-loops documentation is inaccurate
2020-03-28 14:11 [Bug driver/94381] New: -falign-function/-falign-labels/-falign-loops documentation is inaccurate hjl.tools at gmail dot com
@ 2020-03-28 14:33 ` hjl.tools at gmail dot com
2020-03-28 21:36 ` hjl.tools at gmail dot com
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: hjl.tools at gmail dot com @ 2020-03-28 14:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94381
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2020-03-28
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Also
'-falign-loops'
'-falign-loops=N'
'-falign-loops=N:M'
'-falign-loops=N:M:N2'
'-falign-loops=N:M:N2:M2'
and
'-falign-jumps'
'-falign-jumps=N'
'-falign-jumps=N:M'
'-falign-jumps=N:M:N2'
'-falign-jumps=N:M:N2:M2'
specify the maximum alignment. The actual alignment is also controlled by
'-falign-labels'
'-falign-labels=N'
'-falign-labels=N:M'
'-falign-labels=N:M:N2'
'-falign-labels=N:M:N2:M2'
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug driver/94381] -falign-function/-falign-labels/-falign-loops documentation is inaccurate
2020-03-28 14:11 [Bug driver/94381] New: -falign-function/-falign-labels/-falign-loops documentation is inaccurate hjl.tools at gmail dot com
2020-03-28 14:33 ` [Bug driver/94381] " hjl.tools at gmail dot com
@ 2020-03-28 21:36 ` hjl.tools at gmail dot com
2020-03-29 22:57 ` cvs-commit at gcc dot gnu.org
2020-03-29 22:58 ` hjl.tools at gmail dot com
3 siblings, 0 replies; 5+ messages in thread
From: hjl.tools at gmail dot com @ 2020-03-28 21:36 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94381
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
URL| |https://gcc.gnu.org/piperma
| |il/gcc-patches/2020-March/5
| |42861.html
Target Milestone|--- |10.0
Keywords| |patch
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
A patch is posted at
https://gcc.gnu.org/pipermail/gcc-patches/2020-March/542861.html
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug driver/94381] -falign-function/-falign-labels/-falign-loops documentation is inaccurate
2020-03-28 14:11 [Bug driver/94381] New: -falign-function/-falign-labels/-falign-loops documentation is inaccurate hjl.tools at gmail dot com
2020-03-28 14:33 ` [Bug driver/94381] " hjl.tools at gmail dot com
2020-03-28 21:36 ` hjl.tools at gmail dot com
@ 2020-03-29 22:57 ` cvs-commit at gcc dot gnu.org
2020-03-29 22:58 ` hjl.tools at gmail dot com
3 siblings, 0 replies; 5+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2020-03-29 22:57 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94381
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by H.J. Lu <hjl@gcc.gnu.org>:
https://gcc.gnu.org/g:dacc7effeead9ad3e63673f6957661c55e351eb9
commit r10-7454-gdacc7effeead9ad3e63673f6957661c55e351eb9
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Sun Mar 29 15:54:42 2020 -0700
doc: Update -falign-functions/-falign-loops/-falign-jumps
Change -falign-functions=N to
Align the start of functions to the next power-of-two greater than
or equal to N.
Add
If '-falign-labels' is greater than this value, then its value is
used instead.
to -falign-loops=N and -falign-jumps=N.
PR driver/94381
* doc/invoke.texi: Update -falign-functions, -falign-loops and
-falign-jumps documentation.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug driver/94381] -falign-function/-falign-labels/-falign-loops documentation is inaccurate
2020-03-28 14:11 [Bug driver/94381] New: -falign-function/-falign-labels/-falign-loops documentation is inaccurate hjl.tools at gmail dot com
` (2 preceding siblings ...)
2020-03-29 22:57 ` cvs-commit at gcc dot gnu.org
@ 2020-03-29 22:58 ` hjl.tools at gmail dot com
3 siblings, 0 replies; 5+ messages in thread
From: hjl.tools at gmail dot com @ 2020-03-29 22:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94381
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for GCC 10.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-03-29 22:58 UTC | newest]
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2020-03-28 14:11 [Bug driver/94381] New: -falign-function/-falign-labels/-falign-loops documentation is inaccurate hjl.tools at gmail dot com
2020-03-28 14:33 ` [Bug driver/94381] " hjl.tools at gmail dot com
2020-03-28 21:36 ` hjl.tools at gmail dot com
2020-03-29 22:57 ` cvs-commit at gcc dot gnu.org
2020-03-29 22:58 ` hjl.tools at gmail dot com
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