RFR: 8361702: C2: assert(is_dominator(compute_early_ctrl(limit, limit_ctrl), pre_end)) failed: node pinned on loop exit test? [v3]
Roland Westrelin
roland at openjdk.org
Fri Jul 25 14:58:47 UTC 2025
> A node in a pre loop only has uses out of the loop dominated by the
> loop exit. `PhaseIdealLoop::try_sink_out_of_loop()` sets its control
> to the loop exit projection. A range check in the main loop has this
> node as input (through a chain of some other nodes). Range check
> elimination needs to update the exit condition of the pre loop with an
> expression that depends on the node pinned on its exit: that's
> impossible and the assert fires. This is a variant of 8314024 (this
> one was for a node with uses out of the pre loop on multiple paths). I
> propose the same fix: leave the node with control in the pre loop in
> this case.
Roland Westrelin has updated the pull request incrementally with one additional commit since the last revision:
Update src/hotspot/share/opto/loopopts.cpp
Co-authored-by: Christian Hagedorn <christian.hagedorn at oracle.com>
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/26424/files
- new: https://git.openjdk.org/jdk/pull/26424/files/2140c98d..1b658c4b
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=26424&range=02
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=26424&range=01-02
Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
Patch: https://git.openjdk.org/jdk/pull/26424.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/26424/head:pull/26424
PR: https://git.openjdk.org/jdk/pull/26424
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