Integrated: 8255579: x86: Use cmpq(Register, Address) in safepoint_poll

[Aleksey Shipilev]

On Thu, 29 Oct 2020 08:14:27 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> JDK-8253180 added a new block in `safepoint_poll` that uses broken `cmpq` (JDK-8255550): it effectively does the comparison with operands swapped. It makes sense to use the non-broken `cmpq`, as to avoid changing the condition code and thus making the code less understandable. See the discussion in #910. 
> 
> Testing:
>   - [x] `tier1` with Z (some SA tests fail, and some other fail with OOME -- seem to be expected/problem-listed)

This pull request has now been integrated.

Changeset: 4b20e460
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/4b20e460
Stats:     1 line in 1 file changed: 0 ins; 0 del; 1 mod

8255579: x86: Use cmpq(Register,Address) in safepoint_poll

Reviewed-by: eosterlund, zgu

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PR: https://git.openjdk.java.net/jdk/pull/924