[JDK-8269574] C2: Avoid redundant uncommon traps in GraphKit::builtin_throw() for JVMTI exception events - Java Bug System

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Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-8271720	17.0.2	Richard Reingruber	P4	Resolved	Fixed	b01
JDK-8271818	17.0.1	Richard Reingruber	P4	Resolved	Fixed	b05
JDK-8298926	11.0.19-oracle	Tobias Hartmann	P4	Resolved	Fixed	b01
JDK-8274042	11.0.14	Richard Reingruber	P4	Resolved	Fixed	b01

The conditional uncommon trap near the entry of GraphKit::builtin_throw() at
L534 [1] is redundant if the unconditional uncommon trap at L649 is also generated.

The trap at [1] should be generated only if it is known that the trap at [2] is not reached.

[1] https://github.com/openjdk/jdk/blob/561a3a5077a573c88ba94cb7f7412dfc4c97aa91/src/hotspot/share/opto/graphKit.cpp#L534
[2] https://github.com/openjdk/jdk/blob/561a3a5077a573c88ba94cb7f7412dfc4c97aa91/src/hotspot/share/opto/graphKit.cpp#L649

backported by

JDK-8271720 C2: Avoid redundant uncommon traps in GraphKit::builtin_throw() for JVMTI exception events

JDK-8271818 C2: Avoid redundant uncommon traps in GraphKit::builtin_throw() for JVMTI exception events

JDK-8274042 C2: Avoid redundant uncommon traps in GraphKit::builtin_throw() for JVMTI exception events

JDK-8298926 C2: Avoid redundant uncommon traps in GraphKit::builtin_throw() for JVMTI exception events

relates to

JDK-8274982 Add a test for 8269574.

links to

Commit openjdk/jdk11u-dev/9accd6be

Commit openjdk/jdk17u/a575f5c0

Commit openjdk/jdk/72530ef6

Review openjdk/jdk11u-dev/350

Review openjdk/jdk17u/5

Review openjdk/jdk/4623

(6 links to)