Manuel LÃpez-IbÃÃez - (try 2) [4.3] making a few real functions work with dfp (original) (raw)

This is the mail archive of the gcc-patches@gcc.gnu.orgmailing list for the GCC project.

• From: "Manuel LÃpez-IbÃÃez"
• To: "Ben Elliston"
• Cc: gcc-patches
• Date: Thu, 30 Nov 2006 00:45:39 +0000
• Subject: (try 2) [4.3] making a few real functions work with dfp

It seems you didn't like my patch. No problem, I have another. :-)

So again, this patch makes exact_real_truncate() and real_isinteger() handle dfp values correctly.

In order to do so, it compares decimal floating point for equality in value instead of bitwise identity. No normalisation is performed in this patch. Still, I am not sure this is more correct that normalising, since here NaN, infinite and signed zeroes are not handled in the same way as with real_identical. But I have run out of ideas, and without this I cannot implement support for dfp in the new Wconversion option.

Bootstrapped and tested with --enable-languages=all --enable-decimal-float for trunk revision 119259 on i686-pc-linux-gnu

2006-11-30 Manuel Lopez-Ibanez manu@gcc.gnu.org

• real.c (exact_real_truncate): Use REAL_VALUES_EQUAL to compare decimal floating point values instead of real_identical since dfp values are not normalised by design. (real_isinteger): Likewise.

Attachment:wcoercion-6-decimal-float-part1-try2.diff
Description: Text document