This has the look of an over-zealous optimizer that doesn't understand
how 32-bit integer arithmetic works. It is possible to define a flag
to force using doubles to check for integer addition overflow if that
is needed for the compiler used here.
luke
On Wed, 23 Apr 2014, Erich Neuwirth wrote:
Some more strange things:
2000000000L+200000000L
[1] -2094967296
2000000000L*2L
[1] NA
2147483647L+2147483647L
[1] -2
(2147483647 = 2^31-1)
So this looks like an integer overflow is not caught for addition, but it is
for multiplication
This is my R version:
sessionInfo()
R version 3.1.0 (2014-04-10)
Platform: x86_64-apple-darwin13.1.0 (64-bit)
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
--
Luke Tierney
Chair, Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: [email protected]
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
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