When building R-devel with gcc 5.2.0 (mingw-w64 v4) on Windows, make
check fails reg-tests-1b.R at the following check:
x <- c(1:2, NA)
sx <- sd(x)
!is.nan(sx)
Here 'sx' should be 'NA' but it is 'NaN'. It turns out this problem
only appears when the function is byte compiled with optimization
level 3:
mysd <- function (x, na.rm = FALSE)
sqrt(var(if (is.vector(x)) x else as.double(x), na.rm = na.rm))
mysd(x)
# [1] NA
compiler::cmpfun(mysd, list(optimize = 1L))(x)
# [1] NA
compiler::cmpfun(mysd, list(optimize = 2L))(x)
# [1] NA
compiler::cmpfun(mysd, list(optimize = 3L))(x)
# [1] NaN
The problem does not appear with gcc 5.2.0 on Debian, and also not
with gcc 4.9.3 on Windows. Where do I start debugging this? The
disassembled output from the compiled functions is here:
https://gist.github.com/jeroenooms/3206945a6db6680a9c5c
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