[PATCH] D24053: [WebAssembly] Disable folding of GA+reg into load/store constant offsets

[Derek Schuff via llvm-commits]

dschuff created this revision.
dschuff added a reviewer: sunfish.
dschuff added a subscriber: llvm-commits.
Herald added subscribers: dschuff, jfb.

If the register has a negative value then unsigned overflow will occur;
this case is sometimes even created intentionally by LSR. For now
disable GA+reg folding. Fixes PR29127

https://reviews.llvm.org/D24053

Files:
  lib/Target/WebAssembly/WebAssemblyInstrMemory.td
  test/CodeGen/WebAssembly/address-offsets.ll
  test/CodeGen/WebAssembly/negative-base-reg.ll

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