[llvm] [AArch64] Use LD1/ST1 in strict-align mode (PR #211513)

[Oliver Stannard via llvm-commits]

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@@ -3153,6 +3157,15 @@ bool AArch64TargetLowering::allowsMisalignedMemoryAccesses(
       return true;
   }
 
+  // For NEON, we can use LD1/ST1 when the alignment is less than the size of
+  // the vector, but greater than or equal to the size of the elements.
+  if (Subtarget->requiresStrictAlign() && VT.isFixedLengthVector() &&
+      (VT.getSizeInBits() == 64 || VT.getSizeInBits() == 128)) {
+    unsigned ElementSizeBits = VT.getScalarSizeInBits();
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ostannard wrote:

Done

https://github.com/llvm/llvm-project/pull/211513