RFR: JDK-8331732 : [PPC64] Unify and optimize code which converts != 0 to 1 [v12]

[Suchismith Roy]

On Fri, 28 Jun 2024 15:36:41 GMT, Amit Kumar <amitkumar at openjdk.org> wrote:

> Things you may consider:
> 
> 1. `is_64bit` also could be set to a default value; i.e. by default make it `true`;
> 2. I can see that `R0` is used temp register consistently, maybe make it default;

1.  I am not sure if we have a defined default behaviour for it. We are doing the appropriate behaviour based on the version check.So by definition it does not sound to me like there is a default behaviour. 
2. Yes R0 is used, but i think we should have the flexibility to use any register. Making it to R0 default is sounding like R0 is defined just for this, which is not true. 
@TheRealMDoerr  to comment further.

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PR Comment: https://git.openjdk.org/jdk/pull/19886#issuecomment-2197210289