[LLVMbugs] [Bug 14741] Inline Assembly does not honor the =A output constraint

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Jan 2 08:50:28 PST 2013


Eli Friedman <sharparrow1 at yahoo.com> changed:

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

--- Comment #9 from Eli Friedman <sharparrow1 at yahoo.com> 2013-01-02 10:50:28 CST ---
On x86-64, if the operand to "=A" is a 64-bit integer, it is held entirely in
RAX.  So your inline asm not only fails to correctly clobber RDX, it won't do
what you expect.  (Blindly reusing inline assembly written for x86-32 is not a
good idea.)

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