On 04/26/2017 04:46 PM, luke-tier...@uiowa.edu wrote:
Thanks for the report. Fixed in R_devel with r72631; I'll port to R-patched later today or tomorrow.
Thanks!
The default setting and how to get the current settings are documented in the Details section of the enableJIT help page at the end of the paragraph for enableJIT.
Indeed. Sorry for missing that (I was playing with several versions of R and probably looked at the enableJIT man page in the wrong R). H.
Best, luke On Wed, 26 Apr 2017, Hervé Pagès wrote:Hi, I'm running into a case where byte-compilation changes the semantic of a function. This is with R 3.4.0: foo <- function(x) { TRUE && x } foo(c(a=FALSE)) # [1] FALSE # OK foo(c(a=TRUE)) # [1] TRUE # OK foo(c(a=FALSE)) # a # ???? # FALSE The 3rd call returned a result that it different from the 1st call! After scratching my head for a while, I found out that there is a lot going on: 1) When calling foo the first 2 times, the function is not byte-compiled so is behaving as expected. 2) However after the 2nd call, the function gets automatically compiled. This seems to be a new feature in R 3.4.0 but you'll have to grep the NEWS file to find out (search for JIT). The man page for cmpfun/enableJIT nicely explains the JIT levels but I couldn't find anywhere that the level is set to 3 by default. I don't even know how one is supposed to get the current level. Calling enableJIT() to change the level returns a value, and this value might look like the previous level, but this is undocumented and it returns 0 instead of 3 the 1st time I call it anyway. 3) There is some bug in the byte-compiler that seems to make it treat `&&` like if it were `&` when compiling foo. Cheers, H. > sessionInfo() R version 3.4.0 (2017-04-21) Platform: x86_64-pc-linux-gnu (64-bit) Running under: Ubuntu 16.04.2 LTS Matrix products: default BLAS: /home/biocbuild/bbs-3.5-bioc/R/lib/libRblas.so LAPACK: /home/biocbuild/bbs-3.5-bioc/R/lib/libRlapack.so locale: [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C [3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8 [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 [7] LC_PAPER=en_US.UTF-8 LC_NAME=C [9] LC_ADDRESS=C LC_TELEPHONE=C [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C attached base packages: [1] stats graphics grDevices utils datasets methods base loaded via a namespace (and not attached): [1] compiler_3.4.0
-- Hervé Pagès Program in Computational Biology Division of Public Health Sciences Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N, M1-B514 P.O. Box 19024 Seattle, WA 98109-1024 E-mail: hpa...@fredhutch.org Phone: (206) 667-5791 Fax: (206) 667-1319 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
