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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] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 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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