Integrated: 8309405: RISC-V: is_deopt may produce unaligned memory read

[Vladimir Kempik]

On Sat, 3 Jun 2023 12:34:20 GMT, Vladimir Kempik <vkempik at openjdk.org> wrote:

> Please review this simple fix, a continuation of JDK-8291550.
> 
> Doing some profiling for trp_lam event (misaligned load emulation) on fpga I've found some more misaligned loads, pretty rare but still happens.
> Here, is_deopt directly dereferences memory address, but with RVC enabled, a single 4-byte intruction could be 2-bytes, but not 4-bytes aligned.
> So is_deopt should use ld_instr to be on safe side.
> 
> Testing: tier1 on hifive clean.

This pull request has now been integrated.

Changeset: a02d8001
Author:    Vladimir Kempik <vkempik at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/a02d8001fa43b379bee3803cda06a15a64d99ac2
Stats:     1 line in 1 file changed: 0 ins; 0 del; 1 mod

8309405: RISC-V: is_deopt may produce unaligned memory read

Reviewed-by: fyang, luhenry

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PR: https://git.openjdk.org/jdk/pull/14299