public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "mikpe at it dot uu.se" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/51835] ARM EABI violation when passing arguments to helper floating functions like __aeabi_d2iz
Date: Sun, 05 Feb 2012 14:08:00 -0000 [thread overview]
Message-ID: <bug-51835-4-RpAT709PIM@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-51835-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51835
Mikael Pettersson <mikpe at it dot uu.se> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mikpe at it dot uu.se
--- Comment #5 from Mikael Pettersson <mikpe at it dot uu.se> 2012-02-05 14:07:49 UTC ---
(In reply to comment #2)
> This is only applicable to the 4.6 branch and trunk since support for the
> Cortex M4 wasn't added till 4.6.
>
> cheers
> Ramana
Maybe the Cortex M4 wasn't added until 4.6, but the other options are permitted
by 4.5 and I can easily get 4.5 to produce wrong-looking code. With -O2
-mfloat-abi=hard -mfpu=fpv4-sp-d16 -march=armv7-a -marm I see the following
code generation difference between 4.5 and 4.6:
@@ -22,8 +22,9 @@
@ frame_needed = 0, uses_anonymous_args = 0
stmfd sp!, {r3, lr}
bl __aeabi_f2d
+ fmrrd r0, r1, d0
bl __aeabi_d2iz
ldmfd sp!, {r3, pc}
.size func, .-func
- .ident "GCC: (GNU) 4.5.4 20120126 (prerelease)"
+ .ident "GCC: (GNU) 4.6.3 20120203 (prerelease)"
.section .note.GNU-stack,"",%progbits
Backporting r183734 from 4.6 to 4.5 makes 4.5 generate the same code as 4.6,
i.e., with the fmrrd between the two calls.
next prev parent reply other threads:[~2012-02-05 14:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-12 8:01 [Bug target/51835] New: " amker.cheng at gmail dot com
2012-01-16 9:50 ` [Bug target/51835] " rearnsha at gcc dot gnu.org
2012-01-19 23:08 ` ramana at gcc dot gnu.org
2012-01-30 18:05 ` jye2 at gcc dot gnu.org
2012-01-30 18:35 ` jye2 at gcc dot gnu.org
2012-02-05 14:08 ` mikpe at it dot uu.se [this message]
2012-02-06 5:52 ` amker.cheng at gmail dot com
2012-02-10 3:15 ` amker at gcc dot gnu.org
2012-02-14 7:43 ` amker at gcc dot gnu.org
2012-02-23 2:43 ` ramana at gcc dot gnu.org
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=bug-51835-4-RpAT709PIM@http.gcc.gnu.org/bugzilla/ \
--to=gcc-bugzilla@gcc.gnu.org \
--cc=gcc-bugs@gcc.gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).