[llvm] [AMDGPU] Treat GEP offsets as signed in AMDGPUPromoteAlloca (PR #157682)

[Jay Foad via llvm-commits]

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@@ -443,9 +443,10 @@ static Value *GEPToVectorIndex(GetElementPtrInst *GEP, AllocaInst *Alloca,
     return nullptr;
 
   APInt IndexQuot;
-  uint64_t Rem;
-  APInt::udivrem(ConstOffset, VecElemSize, IndexQuot, Rem);
-  if (Rem != 0)
+  APInt Rem;
+  APInt::sdivrem(ConstOffset, APInt(ConstOffset.getBitWidth(), VecElemSize),
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jayfoad wrote:

I think you could still use the form of sdivrem that takes an int64_t dividor, right? Here and below.

https://github.com/llvm/llvm-project/pull/157682