[TargetLowering][RISCV] Propagate fastmath flags for the vector operations emitted in expandVecReduce. (#85164)

We used the fastmath flags for any scalar ops created, but not vector.
2026-01-23 16:06:39 +08:00 · 2024-03-14 08:39:32 -07:00
parent 65c0143296
commit 23323e2837
2 changed files with 199 additions and 629 deletions
--- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -10694,7 +10694,7 @@ SDValue TargetLowering::expandVecReduce(SDNode *Node, SelectionDAG &DAG) const {

      SDValue Lo, Hi;
      std::tie(Lo, Hi) = DAG.SplitVector(Op, dl);
-      Op = DAG.getNode(BaseOpcode, dl, HalfVT, Lo, Hi);
+      Op = DAG.getNode(BaseOpcode, dl, HalfVT, Lo, Hi, Node->getFlags());
      VT = HalfVT;
    }
  }
--- a/llvm/test/CodeGen/RISCV/rvv/fixed-vectors-reduction-fp.ll
+++ b/llvm/test/CodeGen/RISCV/rvv/fixed-vectors-reduction-fp.ll