[Bug c/30527] New: Use of input/output operands in __asm__ templates not fully documented

[davmac at davmac dot org]

It seems that I can use "%k0" (rather than just "%0") in an asm template to
force the (register) operand to "long" size (i.e. a value in %al referenced as
%k0 comes out as %eax in the generated assembly).

This doesn't seem to be documented anywhere. I presume there may be other such
character prefixes which have similar functions.


-- 
           Summary: Use of input/output operands in __asm__ templates not
                    fully documented
           Product: gcc
           Version: 4.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: davmac at davmac dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30527