[riscv-port] RFR: 8279996: riscv: RVB: Add zeros/population count instructions [v2]

Feilong Jiang fjiang at openjdk.java.net
Fri Jan 14 07:09:24 UTC 2022


> This PR implements zeros and population count instructions: `clz`/`clzw`/`ctz`/`ctzw`/`cpop`/`cpopw`.
> 
> New C2 instructions are covered by the following JTREG tests:
> - test/hotspot/jtreg/compiler/codegen/Test6823354.java
> - test/hotspot/jtreg/compiler/codegen/Test7100757.java
> - test/hotspot/jtreg/compiler/codegen/Test8005033.java
> 
> Hotspot and jdk tier1 tests on QEMU (with UseRVB) are passed without new failures.

Feilong Jiang has updated the pull request incrementally with one additional commit since the last revision:

  update license to new year

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

Changes:
  - all: https://git.openjdk.java.net/riscv-port/pull/45/files
  - new: https://git.openjdk.java.net/riscv-port/pull/45/files/e8cd88e5..e4fb09d0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=riscv-port&pr=45&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=riscv-port&pr=45&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/riscv-port/pull/45.diff
  Fetch: git fetch https://git.openjdk.java.net/riscv-port pull/45/head:pull/45

PR: https://git.openjdk.java.net/riscv-port/pull/45


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