[llvm] [AArch64][GlobalISel] Added support for neon right shifts (PR #170832)

[David Green via llvm-commits]

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@@ -1857,6 +1857,111 @@ bool AArch64LegalizerInfo::legalizeIntrinsic(LegalizerHelper &Helper,
     return LowerBinOp(TargetOpcode::G_SAVGFLOOR);
   case Intrinsic::aarch64_neon_srhadd:
     return LowerBinOp(TargetOpcode::G_SAVGCEIL);
+  case Intrinsic::aarch64_neon_sqshrn: {
+    if (!MRI.getType(MI.getOperand(0).getReg()).isVector())
+      return false;
+    // Create right shift instruction. Get v. register the output is written
+    // to
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davemgreen wrote:

I wasnt sure what "Get v. register the output is written to" meant here.

https://github.com/llvm/llvm-project/pull/170832