[llvm-branch-commits] [llvm] [AMDGPU] Codegen support for constrained multi-dword sloads (PR #96163)

[Christudasan Devadasan via llvm-branch-commits]

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@@ -867,13 +867,104 @@ def SMRDBufferImm   : ComplexPattern<iPTR, 1, "SelectSMRDBufferImm">;
 def SMRDBufferImm32 : ComplexPattern<iPTR, 1, "SelectSMRDBufferImm32">;
 def SMRDBufferSgprImm : ComplexPattern<iPTR, 2, "SelectSMRDBufferSgprImm">;
 
+class SMRDAlignedLoadPat<PatFrag Op> : PatFrag <(ops node:$ptr), (Op node:$ptr), [{
+  // Returns true if it is a naturally aligned multi-dword load.
+  LoadSDNode *Ld = cast<LoadSDNode>(N);
+  unsigned Size = Ld->getMemoryVT().getStoreSize();
+  return (Size <= 4) || (Ld->getAlign().value() >= PowerOf2Ceil(Size));
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cdevadas wrote:

Isn't it 12 >= 16 or 16 >=16?
The PowerOf2Ceil intends to catch the first case where the specified Align is smaller than its natural alignment.

https://github.com/llvm/llvm-project/pull/96163