Hello, hackers! While I was searching for a function which checks doubles for infinity, I discovered a function "isinf" in a file src/port/isinf.c where one of three versions returns different value for "-inf" ("1" instead of "-1") comparing to the other two.
It seems concrete values (not just "if isinf(...)") are checked only in float.c in float4out and float8out, but I am going to check for concrete values in my another patch. For systems with HAVE_FPCLASS the function returns the same result for both "+inf" and "-inf". I can't test it on my WS, but I found only one man page where system header file "ieeefp.h" must be included for ability to use "fpclass" function. I guess nothing will be broken if that version of the function returns the same results for input values as the other two. Proposed patch makes that behavior. P.S.: Should the patch be added to the next CF? https://docs.oracle.com/cd/E36784_01/html/E36874/fpclass-3c.html -- Best regards, Vitaly Burovoy
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