[11u backport] RFR(M): 8213754: PPC64: Add Intrinsics for isDigit/isLowerCase/isUpperCase/isWhitespace

[Lindenmaier, Goetz]

Hi Gustavo, 

also this change looks good. 

Best regards,
  Goetz.

> -----Original Message-----
> From: Gustavo Romero <gromero at linux.vnet.ibm.com>
> Sent: Freitag, 18. Januar 2019 16:07
> To: hotspot-compiler-dev at openjdk.java.net; Lindenmaier, Goetz
> <goetz.lindenmaier at sap.com>; Doerr, Martin <martin.doerr at sap.com>;
> vladimir.kozlov at oracle.com; Roger Riggs <Roger.Riggs at oracle.com>
> Cc: Michihiro Horie <HORIE at jp.ibm.com>
> Subject: [11u backport] RFR(M): 8213754: PPC64: Add Intrinsics for
> isDigit/isLowerCase/isUpperCase/isWhitespace
> 
> Hi,
> 
> Could the following backport to 11u be reviewed, please?
> 
> Bug     : https://bugs.openjdk.java.net/browse/JDK-8213754
> Change  : http://hg.openjdk.java.net/jdk/jdk/rev/7384e00d5860
> Backport: http://cr.openjdk.java.net/~gromero/8213754_jdk11u/v1/
> 
> It adds 4 intrinsics that use instructions introduced by POWER9 in order to
> speed up methods isDigit, isLowerCase, isUpperCase, and isWhitespace.
> 
> The change is mostly PPC64-only but it does touch shared code, for
> instance, in order to adapt the methods in question to be properly
> intrinsified. It also needs an additional change [0], since one Graal
> test has to be adapted (a separated RFR to backport [0] was sent to [1]).
> 
> The change applies almost cleanly: only a small tweak is necessary because
> the hunk for ppc.ad file relies on some absent text in the 11u code around
> the change to be applied. That absent text is related to the Superword
> feature (a non-related feature), which is not backported yet to 11u.
> 
> This backport was tested on POWER8 and POWER9 and no regressions were
> observed.
> 
> This backport was also tested on x86_64 with
> ./test/hotspot/jtreg/compiler/{c1,c2,intrinsics} plus
> ./test/hotspot/jtreg/compiler/graalunit (with Graal compiler enabled) with
> change 8215317 [0] applied and no regressions were observed too.
> 
> Thank you.
> 
> Best regards,
> Gustavo
> 
> [0] http://cr.openjdk.java.net/~gromero/8215317_jdk11u/v1/
> [1] https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2019-
> January/032266.html