Hi,
I'm working on compiler for an architecture with a multiply instruction that
takes two 32-bit factors, sign-extends both factors to 64-bits and then does a
64-bit multiplication and stores the result to a destination register. The
combine pass successfully generates the pattern (mulhizi3) f
On 08/12/2013 09:09 AM, Peter Zijlstra wrote:
>>
>> On the majority of architectures, including x86, you cannot simply copy
>> a piece of code elsewhere and have it still work.
>
> I thought we used -fPIC which would allow just that.
>
Doubly wrong. The kernel is not compiled with -fPIC, nor do
On Mon, Aug 12, 2013 at 09:02:02AM -0700, Andi Kleen wrote:
> "H. Peter Anvin" writes:
>
> > However, I would really like to
> > understand what the value is.
>
> Probably very little. When I last looked at it, the main overhead in
> perf currently seems to be backtraces and the ring buffer, not
On Mon, Aug 12, 2013 at 07:56:10AM -0700, H. Peter Anvin wrote:
> On 08/12/2013 02:17 AM, Peter Zijlstra wrote:
> >
> > I've been wanting to 'abuse' static_key/asm-goto to sort-of JIT
> > if-forest functions like perf_prepare_sample() and perf_output_sample().
> >
> > They are of the form:
> >
>
"H. Peter Anvin" writes:
> However, I would really like to
> understand what the value is.
Probably very little. When I last looked at it, the main overhead in
perf currently seems to be backtraces and the ring buffer, not this
code.
-Andi
--
a...@linux.intel.com -- Speaking for myself only
On 7/10/13 5:51 AM, David Given wrote:
> I think I have found a bug. This is in stock gcc 4.8.1...
>
> My backend does not use the 'enabled' attribute; therefore the following
> code in insn-attr.h kicks in:
>
> #ifndef HAVE_ATTR_enabled
> #define HAVE_ATTR_enabled 0
> #endif
>
> Therefore
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On 08/12/2013 02:17 AM, Peter Zijlstra wrote:
>
> I've been wanting to 'abuse' static_key/asm-goto to sort-of JIT
> if-forest functions like perf_prepare_sample() and perf_output_sample().
>
> They are of the form:
>
> void func(obj, args..)
> {
> unsigned long f = ...;
>
> if (f &
On 08/12/13 08:07, Maciej W. Rozycki wrote:
My conclusion therefore is i386/ELF was not maintained, as far as the
return convention is concerned, beyond r34721 and it looks to me like it
should have been converted with r45726 to make use of
ix86_return_in_memory just like generic i386, perhaps
On Tue, 6 Aug 2013, Gabriel Dos Reis wrote:
> On Tue, Aug 6, 2013 at 1:46 PM, Nathan Sidwell wrote:
> > Hi,
> > i386elf.h defines:
> >
> > /* The ELF ABI for the i386 says that records and unions are returned
> >in memory. */
> >
> > #define SUBTARGET_RETURN_IN_MEMORY(TYPE, FNTYPE) \
> >
On Mon, 2013-08-12 at 11:54 +0100, Tejas Belagod wrote:
> >> What's interesting to me here is the bitpos - does this not need
> >> BYTES_BIG_ENDIAN correction? This seems to be inconsistenct with what
> >> happens
> >> with reduction operations in the autovectorizer where the scalar result in
>
What's interesting to me here is the bitpos - does this not need
BYTES_BIG_ENDIAN correction? This seems to be inconsistenct with what happens
with reduction operations in the autovectorizer where the scalar result in the
reduction epilogue gets extracted with a BIT_FIELD_REF but the bitpos ther
2013/8/12 Terry Guo :
>
>
>> -Original Message-
>> From: Ilya Enkovich [mailto:enkovich@gmail.com]
>> Sent: Monday, August 12, 2013 4:37 PM
>> To: Terry Guo
>> Cc: GCC Development
>> Subject: Re: How to specify multiple OSDIRNAME suffixes for multilib
>> (Multilib usage with MPX)?
>>
>>
>>> On 09.08.13 at 19:03, "H.J. Lu" wrote:
> On Fri, Aug 9, 2013 at 12:08 AM, Jan Beulich wrote:
> On 08.08.13 at 18:01, "H.J. Lu" wrote:
>>> On Thu, Aug 8, 2013 at 12:19 AM, Jan Beulich wrote:
>>> On 08.08.13 at 02:33, "H.J. Lu" wrote:
> We use the .gnu_attribute directive to reco
On Mon, Aug 05, 2013 at 12:55:15PM -0400, Steven Rostedt wrote:
> [ sent to both Linux kernel mailing list and to gcc list ]
>
Let me hijack this thread for something related...
I've been wanting to 'abuse' static_key/asm-goto to sort-of JIT
if-forest functions like perf_prepare_sample() and per
> -Original Message-
> From: Ilya Enkovich [mailto:enkovich@gmail.com]
> Sent: Monday, August 12, 2013 4:37 PM
> To: Terry Guo
> Cc: GCC Development
> Subject: Re: How to specify multiple OSDIRNAME suffixes for multilib
> (Multilib usage with MPX)?
>
> Hi Terry,
>
> Thanks a lot for
Hi Terry,
Thanks a lot for your reply! I suppose I have to introduce some new
option like MULTILIB_COMPATIBLE to produce additional search locations
for libraries. Does it sound reasonable? Any advice on implementation?
Thanks,
Ilya
2013/8/12 Terry Guo :
>
>
>> -Original Message-
>> From
On 08/12/2013 05:22 AM, sravan megan wrote:
> Anyone please help me to get out of this issue
It's hard for anyone to do that because we don't have your code.
Did you step through insn-output.c with GDB when compiling your
test case? What happened?
Andrew.
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