> -Original Message-
> From: gcc-ow...@gcc.gnu.org [mailto:gcc-ow...@gcc.gnu.org] On Behalf Of
> Richard Guenther
> Sent: Tuesday, February 21, 2012 6:19 PM
> To: Jiangning Liu
> Cc: gcc@gcc.gnu.org
> Subject: Re: A problem about loop store motion
>
> On Tue, Feb 21, 2012 at 10:57 AM, Ji
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On Tue, Feb 21, 2012 at 1:27 AM, Richard Guenther
wrote:
> On Mon, Feb 20, 2012 at 11:19 PM, Ulrich Weigand wrote:
>> Hello,
>>
>> we've noticed that the loop optimizer sometimes inserts weirdly
>> inefficient code to compute the value of an induction variable
>> at the end of the loop.
>>
>> As
On Tue, Feb 21, 2012 at 04:50:58PM +0100, erotavlas_tu...@libero.it wrote:
> Nobody can answer to my question?
You can configure gcc not to use futexes in libgomp (--disable-linux-futex),
but the default is to use them for performance reasons.
Jakub
On 02/21/2012 03:18 PM, 嘉谟 wrote:
> I do a experiments to check how gcc pass the arguments.
> here is the code
>
> #include
> int main(int argc , char *argv[]){
> int a=3;
> int b=3;
> int c=3;
> printf("%d %d\n",++a+c,a+c);
> printf("%d %d\n",++b,b);
>
I do a experiments to check how gcc pass the arguments.
here is the code
#include
int main(int argc , char *argv[]){
int a=3;
int b=3;
int c=3;
printf("%d %d\n",++a+c,a+c);
printf("%d %d\n",++b,b);
return 0;
}
the anwer is
8 7
4 4
the piece of as
Nobody can answer to my question?
Thank you
Salvatore Frandina
erotavlas_tu...@libero.it writes:
> I read in the manual of GCC the following line:
> // new intrinsic header file, it should be included before
> using any IA-32/x86-64 intrinsics.
> What does it mean? I have to explicitly include this library in my code if I
> want to use the intrinsic functi
Hi,
I read in the manual of GCC the following line:
// new intrinsic header file, it should be included before using
any IA-32/x86-64 intrinsics.
What does it mean? I have to explicitly include this library in my code if I
want to use the intrinsic functions like ssex or mcrc32 etc.
Thank you
Konstantin Vladimirov writes:
> What one must use in custom backend to suppress frame pointer usage by
> default?
>
> Frame pointer is mentioned in ELIMINABLE_REGS:
>
> #define ELIMINABLE_REGS \
> { \
> {ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
> {ARG_POINTER_REGN
Hi,
What one must use in custom backend to suppress frame pointer usage by default?
Frame pointer is mentioned in ELIMINABLE_REGS:
#define ELIMINABLE_REGS \
{ \
{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
{ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \
{FRAME_POIN
On Tue, Feb 21, 2012 at 10:57 AM, Jiangning Liu wrote:
>
>
>> -Original Message-
>> From: Richard Guenther [mailto:richard.guent...@gmail.com]
>> Sent: Tuesday, February 21, 2012 5:40 PM
>> To: Jiangning Liu
>> Cc: gcc@gcc.gnu.org
>> Subject: Re: A problem about loop store motion
>>
>> On
> -Original Message-
> From: Richard Guenther [mailto:richard.guent...@gmail.com]
> Sent: Tuesday, February 21, 2012 5:40 PM
> To: Jiangning Liu
> Cc: gcc@gcc.gnu.org
> Subject: Re: A problem about loop store motion
>
> On Tue, Feb 21, 2012 at 9:54 AM, Jiangning Liu
> wrote:
> >> The ME
On Tue, Feb 21, 2012 at 9:54 AM, Jiangning Liu wrote:
>> The MEM form is more "canonical", so the loop SM machinery to detect
>> equality should be adjusted accordingly. Alternatively you can teach
>> PRE insertion to strip off the MEM if possible (though
>> fold_stmt_inplace should
>> arelady do
On Mon, Feb 20, 2012 at 11:19 PM, Ulrich Weigand wrote:
> Hello,
>
> we've noticed that the loop optimizer sometimes inserts weirdly
> inefficient code to compute the value of an induction variable
> at the end of the loop.
>
> As a test case stripped down to the core of the problem, consider:
>
>
> The MEM form is more "canonical", so the loop SM machinery to detect
> equality should be adjusted accordingly. Alternatively you can teach
> PRE insertion to strip off the MEM if possible (though
> fold_stmt_inplace should
> arelady do this if possible).
Richard,
Thank you! You are right. I n
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