On Tue, 7 Mar 2023 00:19:03 GMT, Sandhya Viswanathan <sviswanat...@openjdk.org> 
wrote:

> For x86 32-bit also things are consistent across. Only the SharedRuntime 
> optimization doesnt happen for x86 32bit as StubRoutines::hf2f() and 
> StubRoutines::f2hf() are set as null. The fallback is handled correctly in 
> interpreter, c1, and c2.

Correct, it is consistent.  Only optimization to calculate constant value 
during compile time is skipped. C2 will generate HW instruction for `ConvF2HF` 
node as if its input was not constant. That is it.

It is possible to add similar Stub routines  for AArch64 and RISC-V to be 
called from C2 but I am not expert in those platforms so I skipped them.

-------------

PR: https://git.openjdk.org/jdk/pull/12869

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