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[Bug tree-optimization/32309] Unnecessary conversion from short to unsigend short breaks vectorization
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 12 Jun 2007 17:36:50 -0000
- Subject: [Bug tree-optimization/32309] Unnecessary conversion from short to unsigend short breaks vectorization
- References: <bug-32309-14687@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #3 from pinskia at gcc dot gnu dot org 2007-06-12 17:36 -------
>Do you mean that short_var + short_var is defined as
> (short)((unsigned short)short_var + (unsigned short)short_var)?
Kinda, because it is really defined by the C standard as:
(short)((int)short_var + (int)short_var)
And then GCC's middle-end optimizes it to:
(short)((unsigned short)short_var + (unsigned short)short_var)
*** This bug has been marked as a duplicate of 26128 ***
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |DUPLICATE
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32309