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4 Commits

Author SHA1 Message Date
Sanjay Patel f90728c322 [InstCombine] don't assume 'inbounds' for bitcast deref or null pointer in non-default address space 
Follow-up to D68244 to account for a corner case discussed in:
https://bugs.llvm.org/show_bug.cgi?id=43501

Add one more restriction: if the pointer is deref-or-null and in a non-default
(non-zero) address space, we can't assume inbounds.

Differential Revision: https://reviews.llvm.org/D68706

llvm-svn: 374728
 2019-10-13 17:19:08 +00:00
Sanjay Patel 0845ac7331 [InstCombine] add another test for gep inbounds; NFC 
llvm-svn: 374190
 2019-10-09 17:52:26 +00:00
Sanjay Patel c38881a6b7 [InstCombine] don't assume 'inbounds' for bitcast pointer to GEP transform (PR43501) 
https://bugs.llvm.org/show_bug.cgi?id=43501
We can't declare a GEP 'inbounds' in general. But we may salvage that information if
we have known dereferenceable bytes on the source pointer.

Differential Revision: https://reviews.llvm.org/D68244

llvm-svn: 373847
 2019-10-06 13:08:08 +00:00
Sanjay Patel dd2d1a168f [InstCombine] add tests for loads of bitcasted vector pointer; NFC 
llvm-svn: 362703
 2019-06-06 13:18:20 +00:00