RFR: 8344355: Register corruption in MacroAssembler::lookup_secondary_supers_table_var: x86-64 only [v2]

[Andrew Haley]

On Wed, 27 Nov 2024 03:10:58 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

> Doesn't `-XX:UseSSE=2` achieve exactly that on x86-64?

Mmm, but x86 so many overlapping architecture changes over the years it's impossible to test every combination of them.

What would be good, though, would be to run tests on whatever the minimum architecture is that we support. I don't think we have any equivalent of  what GCC calls -march=x86-64, "a generic CPU with 64-bit extensions, but it looks like -XX:UseSSE=2 means Opteron aka k8, which "supersets MMX, SSE, SSE2, 3DNow!, and enhanced 3DNow!" and is our minimum CPU.

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PR Review Comment: https://git.openjdk.org/jdk/pull/22365#discussion_r1860380119