middle-end/5840: inline asm: register output parameter overlaps with indirect output parameter

[rth@gcc.gnu.org]

Synopsis: inline asm: register output parameter overlaps with indirect output parameter

State-Changed-From-To: open->closed
State-Changed-By: rth
State-Changed-When: Thu Apr  4 03:22:00 2002
State-Changed-Why:
    This code is incorrect.  If an output is generated
    before all inputs (including output addresses) are
    consumed, one must add an early-clobber marker: "&".
    
    The constraints for m_sbb must be written
    
      : "=&r" ( *pd ), "=&q" ( *pnc ), "=g" ( *pnf )

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