RFR: 8173472: AArch64: C1 comparisons with null only use 32-bit instructions (original) (raw)

David Holmes david.holmes at oracle.com
Wed Feb 1 12:34:11 UTC 2017

Hi Roland,

On 1/02/2017 7:32 PM, Roland Westrelin wrote:

Hi David,

Well that's what I'm questioning. Maybe one of the compiler folk (Roland?) can chime in. C1 was 32-bit only but there was a proprietary 64-bit version. I don't know if OpenJDK ever supported a 64-bit C1. The code would have to have been adapted for tiered compilation. Tiered runs 64-bit c1 so the code is well tested. Building a client only 64 bit VM is forbidden by the build scripts and is as far as I know considered unsupported but given how much testing it gets with tiered compilation, in practice, it's on par with 32 bit c1.

Thanks for clarifying that. So can you also clarify why int is used for Address even in 64-bit?

David

Roland.

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