https://bugs.kde.org/show_bug.cgi?id=356392
Bug ID: 356392
Summary: FPU control word not updated on FYL2X with ST(0) = 0
Product: valgrind
Version: unspecified
Platform: RedHat RPMs
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: vex
Assignee: [email protected]
Reporter: [email protected]
Created attachment 95936
--> https://bugs.kde.org/attachment.cgi?id=95936&action=edit
t.s
x86_64 FC23, with valgrind installed from FC repo.
$ valgrind --version
valgrind-3.11.0
$ uname -a
Linux localhost.localdomain 4.2.5-300.fc23.x86_64 #1 SMP Tue Oct 27
04:29:56 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
See the attached test case. Expected output:
control_word=3804 result=0.000000
Actual output:
control_word=3800 result=0.000000
Evidently the #Z flag isn't set. This trips up the Math.pow() implementation
in the V8 JavaScript engine. I haven't checked other instructions.
Apologies if this has been reported before. I did a search but I didn't find
any bug reports that looked exactly like this issue.
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