There are two instructs for DecodeNKlass in C2, and the difference is only that which temporary register operand is used by them, xheapbase, t0 or t1. It's too complicated and the effect is almost invisible. So we just simplify the pattern by using a temporary register from the register allocation. ------------- Commit messages: - 8278192: riscv: remove unnecessary instruct of DecodeNKlass in C2 Changes: https://git.openjdk.java.net/riscv-port/pull/22/files Webrev: https://webrevs.openjdk.java.net/?repo=riscv-port&pr=22&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8278192 Stats: 51 lines in 3 files changed: 3 ins; 30 del; 18 mod Patch: https://git.openjdk.java.net/riscv-port/pull/22.diff Fetch: git fetch https://git.openjdk.java.net/riscv-port pull/22/head:pull/22 PR: https://git.openjdk.java.net/riscv-port/pull/22