[llvm] 5692a0c - [DAG] visitFP_TO_SINT/FP_TO_UINT - use FoldConstantArithmetic to attempt to constant fold

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2024-10-17T12:50:09+01:00
New Revision: 5692a0c6f846f9b1bacd445f4adedadf66c558ea

URL: https://github.com/llvm/llvm-project/commit/5692a0c6f846f9b1bacd445f4adedadf66c558ea
DIFF: https://github.com/llvm/llvm-project/commit/5692a0c6f846f9b1bacd445f4adedadf66c558ea.diff

LOG: [DAG] visitFP_TO_SINT/FP_TO_UINT - use FoldConstantArithmetic to attempt to constant fold

Don't rely on isConstantFPBuildVectorOrConstantFP followed by getNode() will constant fold - FoldConstantArithmetic will do all of this for us.

Cleanup for #112682

Added: 
    

Modified: 
    llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

Removed: 
    


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diff  --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index ff1ee01b8e43e4..8efa74a3ea7260 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -18128,8 +18128,8 @@ SDValue DAGCombiner::visitFP_TO_SINT(SDNode *N) {
     return DAG.getUNDEF(VT);
 
   // fold (fp_to_sint c1fp) -> c1
-  if (DAG.isConstantFPBuildVectorOrConstantFP(N0))
-    return DAG.getNode(ISD::FP_TO_SINT, DL, VT, N0);
+  if (SDValue C = DAG.FoldConstantArithmetic(ISD::FP_TO_SINT, DL, VT, {N0}))
+    return C;
 
   return FoldIntToFPToInt(N, DL, DAG);
 }
@@ -18144,8 +18144,8 @@ SDValue DAGCombiner::visitFP_TO_UINT(SDNode *N) {
     return DAG.getUNDEF(VT);
 
   // fold (fp_to_uint c1fp) -> c1
-  if (DAG.isConstantFPBuildVectorOrConstantFP(N0))
-    return DAG.getNode(ISD::FP_TO_UINT, DL, VT, N0);
+  if (SDValue C = DAG.FoldConstantArithmetic(ISD::FP_TO_UINT, DL, VT, {N0}))
+    return C;
 
   return FoldIntToFPToInt(N, DL, DAG);
 }