llvm-project.git/llvm/test/CodeGen/ARM/alias_align.ll, branch users/nico/python-2 Unnamed repository; edit this file 'description' to name the repository. [ARM] Convert some tests to opaque pointers (NFC) 2022-12-19T11:45:35+00:00 Nikita Popov npopov@redhat.com 2022-12-19T11:44:09+00:00 bed1c7f061aa12417aa081e334afdba45767b938 






[DAGCombine] Fix alignment for offset loads/stores
2018-06-21T08:30:07+00:00

David Green
david.green@arm.com

2018-06-21T08:30:07+00:00

a465188500672de18918b8c5c36366622429a5ce

The alignment parameter to getExtLoad is treated as a base alignment,
not the alignment of the load (base + offset). When we infer a better
alignment for a Ptr we need to ensure that it applies to the base to
prevent the alignment on the load from being wrong.

This fixes a bug where the alignment could then be used to incorrectly
prove noalias between a load and a store, leading to a miscompile.

Differential Revision: https://reviews.llvm.org/D48029

llvm-svn: 335210





The alignment parameter to getExtLoad is treated as a base alignment,
not the alignment of the load (base + offset). When we infer a better
alignment for a Ptr we need to ensure that it applies to the base to
prevent the alignment on the load from being wrong.

This fixes a bug where the alignment could then be used to incorrectly
prove noalias between a load and a store, leading to a miscompile.

Differential Revision: https://reviews.llvm.org/D48029

llvm-svn: 335210