Date: Mon, 19 Sep 2011 17:52:53 +0200 From: Roman Divacky <rdivacky@freebsd.org> To: Jason Harmening <jason.harmening@gmail.com> Cc: freebsd-current@freebsd.org Subject: Re: Crashes in world built w/ clang: FP registers? Message-ID: <20110919155253.GA35727@freebsd.org> In-Reply-To: <20110919154654.GA35232@freebsd.org> References: <CAM=8qan5K6025J5oBT25s4fz9YgT15mp5SpNsEdzR0Fw%2BHVwig@mail.gmail.com> <20110917062309.GA82256@freebsd.org> <CAM=8qamT19pHEsD86hE-RSoW%2BWO63otm9O-0x2kJR7jhdhEF9g@mail.gmail.com> <20110917214448.GA87874@freebsd.org> <CAM=8qa=jkgYX1L_txCvJzPOtWjoSc3U=ZhY1Jpj0YU%2Bm97OsBQ@mail.gmail.com> <20110919154654.GA35232@freebsd.org>
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On Mon, Sep 19, 2011 at 05:46:54PM +0200, Roman Divacky wrote:
> On Sun, Sep 18, 2011 at 11:05:55AM -0500, Jason Harmening wrote:
> > > Can you try building just tcsh ? I wonder if -O0 makes any difference...
> > >
> > > in either case, can you give me preprocessed (clang -E) source that
> > > exhibits this bug (check with objdump -d that the unaligned sse read
> > > is there) and show me how to reproduce that... I'll try that here.
> > >
> > >
> > > To be honest, I am not sure why others are not seeing this behaviour :(
> > >
> > > roman
> > >
> >
> > Building w/ -O0 eliminated the crash in csh at least. In that case,
> > tw_collect() isn't even using the SSE registers.
> > I've attached the objdump output for csh for both the -O2 and -O0
> > cases, along w/ the preprocessor output for tw.parse.c.
>
> it doesnt build for me.. with tons of errors like
>
> pes ~$ clang tw.parse.cpp
> In file included from ../../contrib/tcsh/tw.parse.c:1:
> In file included from ../../contrib/tcsh/tw.parse.c:36:
> In file included from ../../contrib/tcsh/sh.h:38:
> /usr/include/stddef.h:57:19: error: cannot combine with previous 'type-name'
> declaration specifier
> typedef __wchar_t wchar_t;
> ^
>
> how did you get the preprocessed file? and/or how do you compile it?
Nevermind... I managed to save the file as a .cpp file :)
But I am not seeing any misaligned SSE reads/writes:
pes ~$ clang -O2 -c tw.parse.c && objdump -d tw.parse.o | grep movaps
23: 0f 29 85 60 ff ff ff movaps %xmm0,0xffffffffffffff60(%rbp)
3f6: 0f 29 85 10 ff ff ff movaps %xmm0,0xffffffffffffff10(%rbp)
6b6: 0f 29 85 f0 fe ff ff movaps %xmm0,0xfffffffffffffef0(%rbp)
85b: 0f 29 45 c0 movaps %xmm0,0xffffffffffffffc0(%rbp)
867: 0f 29 45 a0 movaps %xmm0,0xffffffffffffffa0(%rbp)
873: 0f 29 45 80 movaps %xmm0,0xffffffffffffff80(%rbp)
b37: 0f 29 85 d0 fe ff ff movaps %xmm0,0xfffffffffffffed0(%rbp)
e2c: 0f 29 85 c0 fe ff ff movaps %xmm0,0xfffffffffffffec0(%rbp)
e3e: 0f 29 85 a0 fe ff ff movaps %xmm0,0xfffffffffffffea0(%rbp)
e50: 0f 29 85 80 fe ff ff movaps %xmm0,0xfffffffffffffe80(%rbp)
1a4b: 0f 29 45 c0 movaps %xmm0,0xffffffffffffffc0(%rbp)
21e3: 0f 29 45 d0 movaps %xmm0,0xffffffffffffffd0(%rbp)
2647: 0f 29 85 50 fe ff ff movaps %xmm0,0xfffffffffffffe50(%rbp)
2659: 0f 29 85 30 fe ff ff movaps %xmm0,0xfffffffffffffe30(%rbp)
How exactly are you compiling it?
roman
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