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Type: Enhancement
Resolution: Unresolved
Priority: P3
Fix Version/s: tbd
Affects Version/s: 18, 21, 22
Component/s: hotspot
Labels:
- c2
- oracle-triage-21
- performance
- tier1

Subcomponent:
compiler

In patterns like:

if (i >= 42) {
if (i < 10) {

the second test is not optimized out.
This is also related to ~~JDK-8272562~~ where a CastII optimizes to top on a branch that's never taken but optimized out.

duplicates

JDK-8324793 Fold simple range checks

Closed

relates to

JDK-8263252 Improve fold_compares c2 optimizations

Open

JDK-8211518 C2 should optimize if diamonds that feed into Phis merging the same value

In Progress

JDK-8321097 C2: Broken graph due to dying Cast nodes while control cannot be removed

Closed

JDK-8264879 Optimize out redundant ifs for constant test.

Open

JDK-8303970 C2 can not merge homogeneous adjacent two If

Open

JDK-8307768 Constant fold IfNode's based on domination information

Open

JDK-8325674 Constant fold across compares

Open

links to

Review(master) openjdk/jdk/14586

(3 relates to, 1 links to)

Assignee:: Roland Westrelin

Reporter:: Roland Westrelin

Votes:: 0 Vote for this issue

Watchers:: 8 Start watching this issue

Created:: 2021-10-13 00:48

Updated:: 2024-07-09 10:48

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