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Author SHA1 Message Date
Clement Courbet 83ded5d323 re-land "[AA] Teach BasicAA to recognize basic GEP range information." 
Now that PR52104 is fixed.
 2021-10-11 10:04:22 +02:00
Clement Courbet ff41fc07b1 Revert "[AA] Teach BasicAA to recognize basic GEP range information." 
We have found a miscompile with this change, reverting while working on a
reproducer.

This reverts commit 455b60ccfb.
 2021-10-06 16:49:10 +02:00
Clement Courbet 455b60ccfb [AA] Teach BasicAA to recognize basic GEP range information. 
The information can be implicit (from `ValueTracking`) or explicit.

This implements the backend part of the following RFC
https://groups.google.com/g/llvm-dev/c/T9o51zB1JY.

We still need to settle on how to best represent the information in the
IR, but this is a separate discussion.

Differential Revision: https://reviews.llvm.org/D109746
 2021-09-30 08:29:32 +02:00