[Bug target/36079] New: cld instruction is not emitted anymore.

["ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

This bug is opened to track the issue with cld insn.

gcc-4.3.0 does not emit cld instruction anymore in front of string instruction.
Due to this, OSes that does not clear direction flag in task switch can enter
exception handler with D flag set. This is ABI violation since ABI requires D
flag to be cleared on function entry.

Proposed patch (with a lot of follow-up discussion) is here:

http://gcc.gnu.org/ml/gcc-patches/2008-03/msg00417.html

and further discussion here:

http://gcc.gnu.org/ml/gcc-patches/2008-04/msg02026.html


-- 
           Summary: cld instruction is not emitted anymore.
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ubizjak at gmail dot com
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36079