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
