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[Bug c/34389] -Wconversion produces wrong warning
- From: "manu at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 15 Feb 2008 16:53:23 -0000
- Subject: [Bug c/34389] -Wconversion produces wrong warning
- References: <bug-34389-5307@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #7 from manu at gcc dot gnu dot org 2008-02-15 16:53 -------
So fold_unary is transforming (T)(x & c) into (T)x & (T)c. Which is exactly the
opposite transformation that build_binary_op just performed! Weird...
So I see two options:
* Either teach fold_unary to avoid this particular transformation in this
particular case.
* Hack conversion_warning to realize that (short)((int)x & c) is the same as
(short)(x & c) if x is signed int and c fits in a signed int. Which will be
undoing the transformation once more (fourth? fifth time?). And I am not even
sure how to do this.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34389