[Bug sanitizer/55975] asan does not work with 46 bit address space on PowerPC64

[kcc at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55975

--- Comment #25 from Kostya Serebryany <kcc at gcc dot gnu.org> 2013-01-23 12:21:51 UTC ---
So, what is our decision? 

Are we just doing 
-  static const uptr kHighMemEnd = 0x00000fffffffffffUL;
+  static const uptr kHighMemEnd = 0x00003fffffffffffUL;
, leaving SHADOW_OFFSET=(1ULL << 41)
and using ADD instead of OR when applying SHADOW_OFFSET? 

This seems to work on my ppc box (44-bit) with LLVM
(I've changed it to use ADD on PPC)