RFR: 8269122: The use of "extern const" for Register definitions generates poor code [v2]

[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:

  Support enum name_type_Enumvalue for legacy platforms.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4554/files
  - new: https://git.openjdk.java.net/jdk/pull/4554/files/680d735e..0f6396c0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4554&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4554&range=00-01

  Stats: 2 lines in 1 file changed: 1 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