21 May
2014
21 May
'14
4:37 a.m.
Rajat Singh wrote:
One more question. Can I get the reference of global variable in terms of offset from some register like a5 ( for example like move.l 8(%a5),%d0) instead of direct memory address or variable name ? 80000130: 7005 moveq #5,%d0 80000132: 23c0 8000 21ec movel %d0,800021ec <VAR1>
move.l %d0,I move.l VAR1,I
What you mean by get? Gpc supports inline assemby, so you can compute offset using inline assembly. How variable are accessed is left to optimizer. You will get different code if you say request position independent code (-fpic flag) but that affect all code and has speed penalty. If your "variable" is something in memory that may move, then use pointer to access it.
--
Waldek Hebisch
hebisch@math.uni.wroc.pl