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From: kabal@ECE.McGill.CA To: gcc-gnats@gcc.gnu.org Subject: other/8484: gcc 3.2: log(0) => NaN ; -(Inf) => NaN; should return -Inf Date: Wed, 06 Nov 2002 13:06:00 -0000 [thread overview] Message-ID: <20021106210100.31168.qmail@sources.redhat.com> (raw) >Number: 8484 >Category: other >Synopsis: gcc 3.2: log(0) => NaN ; -(Inf) => NaN; should return -Inf >Confidential: no >Severity: non-critical >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Wed Nov 06 13:06:04 PST 2002 >Closed-Date: >Last-Modified: >Originator: Peter Kabal >Release: gcc version 3.2 20020818 (prerelease) >Organization: >Environment: Cygwin under Windows XP pro >Description: Tests show that log(0) returns NaN and negating Inf also gives NaN. Under previous 2.9x versions of gcc, these would both return -Inf. >How-To-Repeat: gcc tInf.c -o tInf.exe >Fix: >Release-Note: >Audit-Trail: >Unformatted: ----gnatsweb-attachment---- Content-Type: text/plain; name="tInf.c" Content-Disposition: inline; filename="tInf.c" #include <math.h> int main (int argc, const char *argv[]) { double dv; dv = -sqrt(1.0) / 0.0; printf ("-sqrt(1) = %g\n", dv); dv = log (0.0); printf ("log(0) = %g\n", dv); return 0; }
next reply other threads:[~2002-11-06 21:06 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-11-06 13:06 kabal [this message] 2002-11-07 22:06 Tim Prince
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