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From: "ro at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/114912] [15 regression] SIGBUS in wi::copy<> on
 SPARC
Date: Thu, 02 May 2024 05:26:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114912

--- Comment #3 from Rainer Orth <ro at gcc dot gnu.org> ---
(In reply to Aldy Hernandez from comment #1)
> Since this happens while building libgcc during stage1, perhaps this can =
be
> reproduced with a cross?  Would it be possible to get the preprocessed fi=
le
> that's failing?

I doubt this can be seen in a cross: running the compilation under truss
reveals
the SIGBUS as

2834:       Incurred fault #5, FLTACCESS  %pc =3D 0x00723E58
2834:         siginfo: SIGBUS BUS_ADRALN addr=3D0xFFBFC954
2834:       Received signal #10, SIGBUS [caught]
2834:         siginfo: SIGBUS BUS_ADRALN addr=3D0xFFBFC954

i.e. an unaligned access.  While SPARC is a strict-alignment target, x86 ca=
res
little if any about alignment at all.

> You could try /var/gcc/reghunt/sigbus-range/288807/./gcc/xgcc -save-temps
> [blah blah], and attach the libgcc2.i file that gets generated.

Sure, please find _muldi3.i attached.

cc1 invocation is

cc1 -fpreprocessed _muldi3.i -quiet -dumpbase _muldi3.c -dumpbase-ext .c
-mcpu=3Dv9 -g -g -g -O2 -O2 -O2 -Wextra -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition
-version -fbuilding-libgcc -fno-stack-protector -fPIC -fvisibility=3Dhidden=
 -o
_muldi3.s=