broken inline exp in glibc/x86??!
On Tue, 9 Jul 2002, RenE J.V. Bertin wrote:
I read the following in acinclude.m4: ## R_PROG_CC_FLAG_D__NO_MATH_INLINES ## --------------------------- ## In current glibc, inline version [x86] of exp is broken. ## We fix this by adding '-D__NO_MATH_INLINES' to R_XTRA_CFLAGS rather ## than AC_DEFINE(__NO_MATH_INLINES) as the former also takes care of ## compiling C code for add-on packages. Is this documented anywhere (where?), e.g. what is broken, which glibc versions are implicated, etc? If not, could anyone please tell me what is the matter -- I to use exp(), and I reckon that gcc will by default use the inline version!
I think that the problem was exp(-Inf) giving NaN rather than 0, but trying to reproduce it with gcc 2.95.4 I can only make it happen with -ffast-math, not with the -O flags. So it may be version-specific, or I may have misremembered -thomas -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._