[LLVMbugs] [Bug 1721] Incorrect evaluation of expression containing bitfield items

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Tue Oct 2 21:21:35 PDT 2007


Chris Lattner <sabre at nondot.org> changed:

           What    |Removed                     |Added
                 CC|                            |neil at daikokuya.co.uk
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |

--- Comment #2 from Chris Lattner <sabre at nondot.org>  2007-10-02 23:21:34 ---
Actually, neil, some language lawyering would be appreciated in this case.  The
GCC tree in question does have the precision set to 33 bits for the PLUS_EXPR. 
Should we emit this as a i33 add?

  <plus_expr 0x4868de70
    type <integer_type 0x4868eb00 public unsigned DI
        size <integer_cst 0x48605930 constant invariant 64>
        unit size <integer_cst 0x48605960 constant invariant 8>
        align 64 symtab 1 alias set -1 precision 33 min <integer_cst 0x4868dc60
0> max <integer_cst 0x4868d240 8589934591>
        LLVM:  i64>

    arg 0 <var_decl 0x48692180 D.1343 type <integer_type 0x4868eb00>


I will investigate a bit more.


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