[LLVMbugs] [Bug 5768] Invalid codegen for shifts

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Sat Dec 12 13:13:04 PST 2009


Eli Friedman <sharparrow1 at yahoo.com> changed:

           What    |Removed                     |Added
                 CC|                            |sharparrow1 at yahoo.com
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID

--- Comment #1 from Eli Friedman <sharparrow1 at yahoo.com>  2009-12-12 15:13:03 ---
C99 6.5.7p3: "The integer promotions are performed on each of the operands." 
The extensions are required by the standard.

The optimizers can't remove them because "lshr i8 %a, %cnt" is undefined if
%cnt is in the range 8-15.

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