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[Bug c/41867] Translation time Floating Point precision is too small
- From: "tydeman at tybor dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 29 Oct 2009 19:27:28 -0000
- Subject: [Bug c/41867] Translation time Floating Point precision is too small
- References: <bug-41867-17245@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #2 from tydeman at tybor dot com 2009-10-29 19:27 -------
Compile options: -std=gnu99 -pedantic -H -fno-builtin -frounding-math
Since I take the gcc that comes with Fedora Core Linux 9 and 10, I have
no idea how GCC was configured.
The output shows that all the file scope (translation time) precisions
used were small (ULP is same magnitude as FLT_EPSILON), while all the
local scope (runtime) precisions used were large (ULP same magnitude as
LDBL_EPSILON). All six should be the same magnitude as LDBL_EPSILON for
this hardware.
None of the messages with 1:, 2:, 3:, 7:, 8:, 11:, or 12: should be printed
if things are done as per the C standard.
A large precision implies a small magnitude ULP value (closer to zero).
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41867