RFR (trivial): 8219519: Remove linux_sparc.ad and linux_aarch64.ad

[Magnus Ihse Bursie]

On 2019-02-27 03:25, Jie Fu wrote:
> Hi Tobias,
>
> Thanks a lot for your review.
>
> It's a bit difficult for me to test this patch since I don't have a 
> sparc or arm machine.
> I've analyzed the adlc processing logic in 
> make/hotspot/gensrc/GensrcAdlc.gmk finding that ad-files under 
> ./src/hotspot/os_cpu/$(HOTSPOT_TARGET_OS)_$(HOTSPOT_TARGET_CPU_ARCH) 
> are optional.
What do you mean by "optional"? The build code does this:

##############################################################################
   # Concatenate all ad source files into a single file, which will be 
fed to
   # adlc.

...

   AD_SRC_FILES := $(call uniq, $(wildcard $(foreach d, $(AD_SRC_ROOTS), \
       $d/cpu/$(HOTSPOT_TARGET_CPU_ARCH)/$(HOTSPOT_TARGET_CPU).ad \
$d/cpu/$(HOTSPOT_TARGET_CPU_ARCH)/$(HOTSPOT_TARGET_CPU_ARCH).ad \
$d/os_cpu/$(HOTSPOT_TARGET_OS)_$(HOTSPOT_TARGET_CPU_ARCH)/$(HOTSPOT_TARGET_OS)_$(HOTSPOT_TARGET_CPU_ARCH).ad 
\
     )))

so it will definitely pick up both those files and use it in creating 
the concatenated ad file.

That being said, maybe this is not the correct behavior.

I see that the linux_sparc.ad file is essentially empty, so you can 
probably remove that. The aarch64 file otoh seems to contain valid code. 
I would not presume that you can just remove it!

/Magnus

> Since both linux_sparc.ad and linux_aarch64.ad are useless for the 
> generation of C2, it would be better to remove them.
>
> I'll try my best to test it.
>
> By the way, I really appreciate If someone with sparc or aarch64 
> development environment could help to verify this change.
> Thanks in advance.
>
> Best regards,
> Jie
>
>
> On 2019/2/27 上午12:51, Tobias Hartmann wrote:
>> Hi Jie,
>>
>> this looks good to me assuming that you have tested the change on 
>> these platforms.
>>
>> Best regards,
>> Tobias
>>
>> On 21.02.19 10:35, Jie Fu wrote:
>>> Hi all,
>>>
>>> The following two source files are useless for the generation of C2 
>>> and should be removed.
>>>   1) ./src/hotspot/os_cpu/linux_sparc/linux_sparc.ad
>>>   2) ./src/hotspot/os_cpu/linux_aarch64/linux_aarch64.ad
>>>
>>> Bug:    https://bugs.openjdk.java.net/browse/JDK-8219519
>>> Webrev: http://cr.openjdk.java.net/~jiefu/8219519/webrev.00/
>>>
>>> Could you please review it?
>>> Thanks a lot.
>>>
>>> Best regards,
>>> Jie
>>>
>>>
>