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From: "michael.hope at linaro dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/48783] New: ARM: kernel compiled at -O2 has a unused reference to __aeabi_uldivmod
Date: Tue, 26 Apr 2011 23:46:00 -0000 [thread overview]
Message-ID: <bug-48783-4@http.gcc.gnu.org/bugzilla/> (raw)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48783
Summary: ARM: kernel compiled at -O2 has a unused reference to
__aeabi_uldivmod
Product: gcc
Version: 4.5.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: michael.hope@linaro.org
Created attachment 24107
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24107
Preprocessed source
When compiled, the attached code refers to the 64 bit unsigned divmod helper
function '__aeabi_uldivmod' even though the function is never called. This
causes a link error when cross-compiling an ARM Linux 2.6.38 kernel.
To reproduce:
* Make a arm-linux-gnueabi cross compiler configured with --with-mode=thumb
--with-arch=armv7-a --with-tune=cortex-a9 --with-float=softfp --with-fpu=neon
* Compile the attached code with 'arm-linux-gnueabi-gcc -O2 -S wm8974.i'
* See a '.global __aeabi_uldivmod' in the header of wm8974_set_dai_pll
Marking pll_factors() as noinline or putting asm("" : "+r"(source)); before the
call to do_div() works around the problem.
next reply other threads:[~2011-04-26 23:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-26 23:46 michael.hope at linaro dot org [this message]
2011-04-27 9:43 ` [Bug c/48783] " ams at gcc dot gnu.org
2011-04-27 9:56 ` michael.hope at linaro dot org
2011-04-27 10:13 ` michael.hope at linaro dot org
2011-04-27 11:09 ` ams at gcc dot gnu.org
2011-05-31 22:31 ` ramana at gcc dot gnu.org
2012-01-29 4:51 ` [Bug tree-optimization/48783] ~0ULL % (a / (a & -a)) == 0 is not optimized to false on the tree level pinskia at gcc dot gnu.org
2023-01-30 18:40 ` pinskia at gcc dot gnu.org
2023-01-30 18:43 ` pinskia at gcc dot gnu.org
2023-08-18 13:57 ` jemarch at gcc dot gnu.org
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