[AMDGPU] Set fcanonicalize to Legal for f32,f64

Author: dominik-steenken

llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp

@@ -423,6 +423,11 @@ AMDGPUTargetLowering::AMDGPUTargetLowering(const TargetMachine &TM,
   setOperationAction({ISD::FLOG10, ISD::FLOG, ISD::FEXP, ISD::FEXP10}, MVT::f16,
                      Custom);
 
+  setOperationAction(ISD::FCANONICALIZE, {MVT::f32, MVT::f64}, Legal);
+  if (Subtarget->has16BitInsts()) {
+    setOperationAction(ISD::FCANONICALIZE, MVT::f16, Legal);
+  }
+
   // FIXME: These IS_FPCLASS vector fp types are marked custom so it reaches
   // scalarization code. Can be removed when IS_FPCLASS expand isn't called by
   // default unless marked custom/legal.