[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 #24 from Kostya Serebryany <kcc at gcc dot gnu.org> 2013-01-21 
09:11:22 UTC ---

I've tried adding the offset instead of OR-ing it and got 2%-5% slowdown and

same code size increase on SPEC on x86_64 (using fresh clang -02). 

So, yes, if we want to keep the shadow offset 2^41 on PPC, we need to add the

offset, while still OR-ing it on other architectures. 



It's sad we can't use zero base on PPC.