[clang] [llvm] [RISCV][P-ext] Add packed saturation intrinsics (PR #224432)

[via llvm-commits]

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@@ -17628,6 +17635,23 @@ void RISCVTargetLowering::ReplaceNodeResults(SDNode *N,
       Results.push_back(DAG.getExtractSubvector(DL, VT, Res, 0));
       return;
     }
+    case Intrinsic::riscv_psati:
+    case Intrinsic::riscv_pusati: {
+      MVT VT = N->getSimpleValueType(0);
+      if (!Subtarget.is64Bit() || VT != MVT::v2i16)
+        return;
+
+      MVT WideVT = MVT::v4i16;
+      SDValue Rs1 =
+          widenPackedVectorWithZeros(DAG, DL, N->getOperand(1), WideVT);
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sihuan wrote:

We do not. They now use the shared undef widening a few cases above, which
also drops the zext.w on RV64.

https://github.com/llvm/llvm-project/pull/224432