When `left == right` is known at code generation time, the operands are necessarily the same oop, so we can jump directly to `L_oops_equal`. This patch changes both x86 and aarch65 to do that.
I also considered emitting `equal_result` and returning early in that case. I decided not to do that because `LIR_OpSubstitutabilityCheck::emit_code()` still appends the slow-path stub after `emit_opSubstitutabilityCheck()` returns. An early return here would skip binding `op->stub()->continuation()`, leaving the appended stub with an unbound continuation label. --------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - 8386861: [lworld] emit_opSubstitutabilityCheck speedup Changes: https://git.openjdk.org/valhalla/pull/2628/files Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2628&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8386861 Stats: 18 lines in 2 files changed: 8 ins; 4 del; 6 mod Patch: https://git.openjdk.org/valhalla/pull/2628.diff Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2628/head:pull/2628 PR: https://git.openjdk.org/valhalla/pull/2628
