[Bug c/40503] New: DEC_EVAL_METHOD not match operators

[Bug c/40503] New: DEC_EVAL_METHOD not match operators

[tydeman at tybor dot com]

It appears that decimal floating-point (DFP) constants and the operators "+"
and "-" are done to type (as if DEC_EVAL_METHOD were 0), but that the operators
"*" and "/" are done as if _Decimal128 (as if DEC_EVAL_METHOD were 2) -- this
is in gcc 4.4.0.  In gcc 4.3.2, everything was done as if to type
(DEC_EVAL_METHOD were 0).  This in on Intel Pentium 4 with Fedora Core Linux
11.


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           Summary: DEC_EVAL_METHOD not match operators
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tydeman at tybor dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40503

[Bug target/40503] DEC_EVAL_METHOD not match operators

[hjl dot tools at gmail dot com]

------- Comment #1 from hjl dot tools at gmail dot com  2009-06-25 00:15 -------
Can you provide a testcase?


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hjl dot tools at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40503

[Bug target/40503] DEC_EVAL_METHOD not match operators

[tydeman at tybor dot com]

------- Comment #2 from tydeman at tybor dot com  2009-06-26 05:57 -------
Created an attachment (id=18073)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18073&action=view)
Find precision of *, /, +, -, ==


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40503

[Bug target/40503] DEC_EVAL_METHOD not match operators

[tydeman at tybor dot com]

------- Comment #3 from tydeman at tybor dot com  2009-10-20 06:25 -------
In 4.4.1, it appears that the type of the LHS in LHS = RHS determines how the
RHS
is evaluated.  If the RHS involves only _Decimal32 types, then the RHS will be
evaluated to the type of the LHS (_Decimal32, 64, or 128).  That behavoiur is
not
what C99 wants.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40503