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Bug ID: 6873777 FPU control word optimization still performed with SSE
6873777 : FPU control word optimization still performed with SSE

Details
Type:
Bug
Submit Date:
2009-08-19
Status:
Resolved
Updated Date:
2010-04-02
Project Name:
JDK
Resolved Date:
2009-09-16
Component:
hotspot
OS:
solaris_9
Sub-Component:
compiler
CPU:
x86
Priority:
P4
Resolution:
Fixed
Affected Versions:
hs17
Fixed Versions:
hs17

Related Reports
Backport:
JDK-2183209 - FPU control word optimization still performed with SSE
Backport:
JDK-2189957 - FPU control word optimization still performed with SSE

Sub Tasks

Description
While looking at generated code for another reason, I noticed that C2 tries to do the 24 fpu optimization even when SSE is being used for floating point.  This creates at least a little overhead from the extra fldcw calls and is certainly useless.

Comments
EVALUATION

http://hg.openjdk.java.net/jdk7/hotspot-comp/hotspot/rev/cd18bd5e667c
2009-08-20


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