[FPEnv] Add an option to disable strict float node mutating to an normal

float node

This patch add an option 'disable-strictnode-mutation' to prevent strict
node mutating to an normal node.
So we can make sure that the patch which sets strict-node as legal works
correctly.

Patch by Chen Liu(LiuChen3)

Differential Revision: https://reviews.llvm.org/D70226

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
index ac4c83e8148..2770d512c78 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
@@ -319,9 +319,9 @@ SDValue VectorLegalizer::LegalizeOp(SDValue Op) {
     // best approach, except in the case where the resulting strict (scalar)
     // operations would themselves use the fallback mutation to non-strict.
     // In that specific case, just do the fallback on the vector op.
-    if (Action == TargetLowering::Expand &&
+    if (Action == TargetLowering::Expand && !TLI.isStrictFPEnabled() &&
         TLI.getStrictFPOperationAction(Node->getOpcode(),
-                                       Node->getValueType(0))
+                                   Node->getValueType(0))
         == TargetLowering::Legal) {
       EVT EltVT = Node->getValueType(0).getVectorElementType();
       if (TLI.getOperationAction(Node->getOpcode(), EltVT)