RFR: 8269122: The use of "extern const" for Register definitions generates poor code [v3]

[Andrew Haley]

> Register definitions in HotSpot are declared as "extern const"
> for ancient-historical reasons. We should stop doing that: it would
> make the assembler significantly faster and smaller, improving both
> bootstrap time and compilation speed.
> 
> This change shaves 2% off the size of the text section of libjvm.so on AArch64.

Andrew Haley has updated the pull request incrementally with one additional commit since the last revision:

  Update copyright

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4554/files
  - new: https://git.openjdk.java.net/jdk/pull/4554/files/0f6396c0..621c25be

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4554&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4554&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4554.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4554/head:pull/4554

PR: https://git.openjdk.java.net/jdk/pull/4554