[llvm] [LLVM] treat `@llvm.ssub.sat` the same as `@llvm.aarch64.neon.sqsub` (PR #140454)

[Folkert de Vries via llvm-commits]

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@@ -1795,6 +1795,14 @@ bool AArch64LegalizerInfo::legalizeIntrinsic(LegalizerHelper &Helper,
     MI.eraseFromParent();
     return true;
   }
+  case Intrinsic::aarch64_neon_sqadd:
+    return LowerBinOp(TargetOpcode::G_SADDSAT);
+  case Intrinsic::aarch64_neon_sqsub:
+    return LowerBinOp(TargetOpcode::G_SSUBSAT);
+  case Intrinsic::aarch64_neon_uqadd:
+    return LowerBinOp(TargetOpcode::G_UADDSAT);
+  case Intrinsic::aarch64_neon_uqsub:
+    return LowerBinOp(TargetOpcode::G_USUBSAT);
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folkertdev wrote:

is this what you meant? Is anything else needed here?

https://github.com/llvm/llvm-project/pull/140454