[llvm] [DAG] Support saturated truncate (PR #99418)

[Craig Topper via llvm-commits]

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@@ -16617,9 +16631,11 @@ static SDValue combineTruncToVnclip(SDNode *N, SelectionDAG &DAG,
 
   SDValue Val;
   unsigned ClipOpc;
-  if ((Val = DetectUSatPattern(Src)))
+
+  Val = N->getOperand(0);
+  if (N->getOpcode() == RISCVISD::TRUNCATE_VECTOR_VL_USAT)
     ClipOpc = RISCVISD::VNCLIPU_VL;
-  else if ((Val = DetectSSatPattern(Src)))
+  else if (N->getOpcode() == RISCVISD::TRUNCATE_VECTOR_VL_SSAT)
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topperc wrote:

Nevermind. It's not the same because VNCLIP has a shift amount.

https://github.com/llvm/llvm-project/pull/99418