RFR(M): 8213134: AArch64: vector shift failed with MaxVectorSize=8

[Vladimir Kozlov]

Thank you, Yang, for running testing.
No more comments from me.

Vladimir

On 11/28/18 10:39 PM, Yang Zhang (Arm Technology China) wrote:
> Hi Vladimir
> 
> I run all the jtreg test(hotspot/langtools/jdk, compiler/c2/cr634086 is included). They are passed.
> 
> Regards
> Yang
> 
> -----Original Message-----
> From: Vladimir Kozlov <vladimir.kozlov at oracle.com>
> Sent: Thursday, November 29, 2018 2:13 AM
> To: Yang Zhang (Arm Technology China) <Yang.Zhang at arm.com>; Andrew Haley <aph at redhat.com>; hotspot-dev at openjdk.java.net
> Subject: Re: RFR(M): 8213134: AArch64: vector shift failed with MaxVectorSize=8
> 
> Looks good.
> 
> What testing you did?
> Unfortunately compiler/c2/cr634086 test is not part of tier1 testing and not executed by 'submit' repo testing. You need to run it.
> 
> Thanks,
> Vladimir
> 
> On 11/28/18 12:32 AM, Yang Zhang (Arm Technology China) wrote:
>> Hi Andrew, Vladimir
>>
>> I update the reviewers and remove the new assert in Matcher::vector_shift_count_ideal_reg(). Could you please help review again?
>>
>> http://cr.openjdk.java.net/~yzhang/8213134/webrev.02/
>>
>> Regards
>> Yang
>>
>> -----Original Message-----
>> From: Vladimir Kozlov <vladimir.kozlov at oracle.com>
>> Sent: Thursday, November 22, 2018 1:56 AM
>> To: Yang Zhang (Arm Technology China) <Yang.Zhang at arm.com>;
>> hotspot-dev at openjdk.java.net
>> Subject: Re: RFR(M): 8213134: AArch64: vector shift failed with
>> MaxVectorSize=8
>>
>> You are right. I think I was confused that you are not limiting MaxVectorSize but simple use min(16, MaxVectorSize).
>>
>> The assert is fine.
>>
>> Thanks,
>> Vladimir
>>
>> On 11/20/18 10:28 PM, Yang Zhang (Arm Technology China) wrote:
>>>
>>>> I don't see any checking or setting for MaxVectorSize in vm_version_aarch64.cpp.
>>>> In such case you will definitely hit your new assert Matcher::vector_shift_count_ideal_reg().
>>>> aarch64.ad code Matcher::vector_width_in_bytes() has limit vector size to 16 bytes. So using  MaxVectorSize > 16 will hit the assert.
>>>
>>> Matcher::vector_width_in_bytes() limits vector size to min(16, MaxVectorSize).
>>> Matcher::vector_shift_count_ideal_reg() assert(MaxVectorSize >= size,
>>> "Length isn't supported"); When MaxVectorSize is 8, size is 8.
>>> When MaxVectorSize is greater than or equal 16, size is 16.
>>> So (MaxVectorSize >= size) is always true.
>>>
>>> Test cases of cr6340864 are passed with or without this new  assert.
>>>
>>> Do I need to remove this new assert?
>>>
>>> Regards
>>> Yang
>>>
>>>
>>> On 11/18/18 11:53 PM, Yang Zhang (Arm Technology China) wrote:
>>>> Hi,
>>>>
>>>> When I implemented AArch64 NEON for Vector API (http://openjdk.java.net/jeps/338), I found an issue about vector shift. I have a patch which could fix this issue. Could anyone help to review this patch?
>>>>
>>>> Webrev: http://cr.openjdk.java.net/~yzhang/8213134/webrev.01/
>>>> JBS:  https://bugs.openjdk.java.net/browse/JDK-8213134
>>>>
>>>> This patch is verified both in jdk/jdk master and panama/vectorIntrinsics, and tests are passed.
>>>> Hotspt jtreg contains the following test cases that can cover all the patterns of vector shift.  But only default option "-XX:MaxVectorSize=64" is tested, so this issue isn't detected. Now I add "-XX:MaxVectorSize=8", "-XX:MaxVectorSize=16" and "-XX:MaxVectorSize=32" to these jtreg tests in this patch.
>>>> compiler/c2/cr6340864/TestByteVect.java
>>>> compiler/c2/cr6340864/TestIntVect.java
>>>> compiler/c2/cr6340864/TestShortVect.java
>>>> compiler/codegen/TestCharVect2.java
>>>>
>>>> Regards
>>>> Yang
>>>>
>>>>
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