On 10/27/2014 12:50 AM, Zhenqiang Chen wrote:
> Good point. It is not ccmp special. It is cbranchcc4 related. If I
> understand correct, without cbranchcc4, we need put the result to a tmp
> register and generate additional compares, which is not good for
> performance.
It won't be an additional
> -Original Message-
> From: Richard Henderson [mailto:r...@redhat.com]
> Sent: Sunday, October 12, 2014 5:40 AM
> To: Zhenqiang Chen; gcc-patches@gcc.gnu.org
> Subject: Re: [Ping] [PATCH, 10/10] aarch64: Handle ccmp in ifcvt to make
it
> work with cmov
>
>
On 09/22/2014 11:46 PM, Zhenqiang Chen wrote:
> @@ -2375,10 +2387,21 @@ noce_get_condition (rtx_insn *jump, rtx_insn
> **earliest, bool then_else_reversed
>return cond;
> }
>
> + /* For conditional compare, set ALLOW_CC_MODE to TRUE. */
> + if (targetm.gen_ccmp_first)
> +{
>
10/10] aarch64: Handle ccmp in ifcvt to make it work
> with cmov
>
> Andrew,
>
> Thanks for the input. Patch is updated with your codes. In addition, add
> "cstorecc4" and 4 test cases. So it can optimized the following example
>
> int foo (int a, int b)
> {
&
Andrew,
Thanks for the input. Patch is updated with your codes. In addition,
add "cstorecc4" and 4 test cases. So it can optimized the following
example
int foo (int a, int b)
{
return a > 0 && b < 7;
}
to:
cmpw0, wzr
ccmpw1, #6, #9, gt
csetw0, le
Bootstrap and no make
> On Jun 23, 2014, at 12:37 AM, Zhenqiang Chen
> wrote:
>
>> On 23 June 2014 15:09, Andrew Pinski wrote:
>> On Mon, Jun 23, 2014 at 12:01 AM, Zhenqiang Chen
>> wrote:
>>> Hi,
>>>
>>> The patch enhances ifcvt to handle conditional compare instruction
>>> (ccmp) to make it work with cmov. For
On 23 June 2014 15:09, Andrew Pinski wrote:
> On Mon, Jun 23, 2014 at 12:01 AM, Zhenqiang Chen
> wrote:
>> Hi,
>>
>> The patch enhances ifcvt to handle conditional compare instruction
>> (ccmp) to make it work with cmov. For ccmp, ALLOW_CC_MODE is set to
>> TRUE when calling canonicalize_conditio
On Mon, Jun 23, 2014 at 12:09 AM, Andrew Pinski wrote:
> On Mon, Jun 23, 2014 at 12:01 AM, Zhenqiang Chen
> wrote:
>> Hi,
>>
>> The patch enhances ifcvt to handle conditional compare instruction
>> (ccmp) to make it work with cmov. For ccmp, ALLOW_CC_MODE is set to
>> TRUE when calling canonicali
On Mon, Jun 23, 2014 at 12:01 AM, Zhenqiang Chen
wrote:
> Hi,
>
> The patch enhances ifcvt to handle conditional compare instruction
> (ccmp) to make it work with cmov. For ccmp, ALLOW_CC_MODE is set to
> TRUE when calling canonicalize_condition. And the backend does not
> need to generate additio
Hi,
The patch enhances ifcvt to handle conditional compare instruction
(ccmp) to make it work with cmov. For ccmp, ALLOW_CC_MODE is set to
TRUE when calling canonicalize_condition. And the backend does not
need to generate additional "compare (CC, 0)" for it.
Bootstrap and no check regression on
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