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Type: Bug
Resolution: Fixed
Priority: P3
Fix Version/s: hs14
Affects Version/s: 6
Component/s: hotspot
Labels:
- jdk7-b39

Subcomponent:
compiler
Resolved In Build:
b06
CPU:

x86, sparc
OS:

linux, solaris_9

Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-2177308	7	Tom Rodriguez	P3	Closed	Fixed	b39
JDK-2172782	6u14	Tom Rodriguez	P3	Resolved	Fixed	b01

While investigating the performance of HashMap.get(k) I noticed that in cases where the static type of k is available C2 isn't taking advantage of the information in making it's inline decisions for get. The problem is that Phis which are introduced for the join of a diamond aren't being eliminated aggressively during parsing when one of the paths is proved dead. Additionally unneeded loop phis are hiding the type k in the search loop, impairing the inlining of equals. Post parse inlining which remove the need for aggressive elimination of phis but for now we need a better strategy for simplification of phis.

backported by

JDK-2172782 Phis which are later unneeded are impairing our ability to inline based on static types

Resolved

JDK-2177308 Phis which are later unneeded are impairing our ability to inline based on static types

Closed

duplicates

JDK-6396953 Code runs slower after optimization when using server compiler

Closed

relates to

JDK-6750588 assert(lrg._area >= 0,"negative spill area") running NSK stmp0101 test

Closed

JDK-7024475 loop doesn't terminate when compiled

Closed

JDK-6805522 Server VM fails with assertion (block1->start() != block2->start(),"successors have unique bcis")

Closed

JDK-6850611 int / long arithmetic seems to be broken in 1.6.0_14 HotSpot Server VM (Win XP)

Closed

JDK-7044738 Loop unroll optimization causes incorrect result

Closed

JDK-6742111 split_flow_path can create irreducible loops

Closed

(4 relates to)

Assignee:: Tom Rodriguez

Reporter:: Tom Rodriguez

Votes:: 0 Vote for this issue

Watchers:: 0 Start watching this issue

Created:: 2006-02-10 09:21

Updated:: 2022-10-26 08:19

Resolved:: 2008-10-07 11:23

Imported:: 17/Sep/12 12:15 AM

Indexed:: 19/Jul/12 5:48 PM

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