[llvm] [AArch64][GlobalISel] Legalize G_STORE for v4s8 vector (PR #82498)

[Amara Emerson via llvm-commits]

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@@ -1599,6 +1602,18 @@ bool AArch64LegalizerInfo::legalizeLoadStore(
   Register ValReg = MI.getOperand(0).getReg();
   const LLT ValTy = MRI.getType(ValReg);
 
+  // G_STORE v4s8, ptr => s32 = G_BITCAST v4s8
+  //                      G_STORE s32, ptr
+  if (ValTy.isVector() && ValTy.getNumElements() == 4 &&
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aemerson wrote:

If you're just checking for a specific type you can do `if (ValTy == LLT::fixed_vector(4, 8))`

https://github.com/llvm/llvm-project/pull/82498