RFR: 8301697: [s390] Optimized-build is broken

[Aleksey Shipilev]

On Fri, 3 Feb 2023 04:47:32 GMT, Amit Kumar <duke at openjdk.org> wrote:

> As title states optimized build is broken with GCC-9.4.0 and After my code changes build is now again successful. I've done testing for optimised, release, fastdebug, slowdebug on s390 and they're successful with these code changes.

I was confused a bit about this, because my own S390X optimized builds build fine:
https://builds.shipilev.net/openjdk-jdk/build-logs/build-openjdk-jdk-linux-s390x-server-optimized-gcc10-glibc2.31.log

So, current code is supposed to build fine. I think it is arguably correct to protect the asserts with `ASSERT`/`DEBUG` rather than `PRODUCT`, which would hide them in the optimized builds. But I look at the original issue, and the optimized build is actually failing on the assert, which is why my (cross-compiled) builds are fine! See:


A fatal error has been detected by the Java Runtime Environment:

 Internal Error (src/hotspot/cpu/s390/macroAssembler_s390.cpp:5498), pid=3076078, tid=3076083
 guarantee(false) failed: Z assembly code requires stop: killed Z_R14 


So, this change only hides the issue, not fixes it? If so, I don't think this is a good way to solve the issue.
I suggest you `git bisect` and identify which change introduced this failure, and work from there.

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PR: https://git.openjdk.org/jdk/pull/12400