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Type: Bug
Resolution: Fixed
Priority: P4
Fix Version/s: 9
Affects Version/s: 8u112, 9
Component/s: core-libs
Labels:
- noreg-build
- performance

Subcomponent:
java.lang
Resolved In Build:
b148
CPU:

ppc, aarch64, s390x
OS:

linux

Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-8183588	8u161	Gustavo Romero	P4	Resolved	Fixed	b01
JDK-8170873	8u152	Gustavo Romero	P4	Resolved	Fixed	b01
JDK-8192077	emb-8u161	Gustavo Romero	P4	Resolved	Fixed	b01

Currently fdlibm optimization is disabled for PPC64/s390x/aarch64, as a consequence StrictMath methods like, but not limited to, sin(), cos(), and tan() perform poor.

Switching on the O3 optimization on gcc can damage the precision of those methods, nonetheless it's possible to avoid that side effect and yet get the huge benefits from the -O3 optimization on PPC64/s390 if -ffp-contract=off is passed in addition to the -O3 optimization flag.

backported by

JDK-8170873 PPC64/aarch64: Poor StrictMath performance due to non-optimized compilation

Resolved

JDK-8183588 PPC64/s390x/aarch64: Poor StrictMath performance due to non-optimized compilation

Resolved

JDK-8192077 PPC64/s390x/aarch64: Poor StrictMath performance due to non-optimized compilation

Resolved

relates to

JDK-8210416 [linux] Poor StrictMath performance due to non-optimized compilation

Resolved

JDK-8210425 [x86] sharedRuntimeTrig/sharedRuntimeTrans compiled without optimization

Resolved

JDK-4947390 Improve compiler options compiling fdlibm

Closed

(1 relates to)

Assignee:: Gustavo Romero

Reporter:: Gustavo Romero

Votes:: 0 Vote for this issue

Watchers:: 5 Start watching this issue

Created:: 2016-11-21 14:38

Updated:: 2018-09-05 09:59

Resolved:: 2016-12-02 08:06

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