[Bug middle-end/42344] [4.5 Regression] ICE in rs6000.md with ipa-sra for 252.eon

[amodra at gmail dot com]

------- Comment #4 from amodra at gmail dot com  2010-01-28 00:17 -------
I haven't looked in detail at this yet, but why are we getting nonlocal
sibcalls at all for sysv?  rs6000_function_ok_for_sibcall says we shouldn't. 
I'm not sure why the nonlocal sibcall patterns even accept DEFAULT_ABI ==
ABI_V4.

Incidentally, the reason why we can't do a nonlocal sibcall when using secure
plt is that pic_offset_table_rtx (got pointer reg, r30) needs to be live as a
pic plt call stub uses r30.  Since that register is non-volatile it can't be
live for the tail call.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42344