XCore target: change to Sched::Source

This sidesteps a bug in PrescheduleNodesWithMultipleUses() which
does not check if callResources will be affected by the transformation.

llvm-svn: 190299

llvm/lib/Target/XCore/XCoreISelLowering.cpp

@@ -79,7 +79,7 @@ XCoreTargetLowering::XCoreTargetLowering(XCoreTargetMachine &XTM)
 
   setStackPointerRegisterToSaveRestore(XCore::SP);
 
-  setSchedulingPreference(Sched::RegPressure);
+  setSchedulingPreference(Sched::Source);
 
   // Use i32 for setcc operations results (slt, sgt, ...).
   setBooleanContents(ZeroOrOneBooleanContent);

llvm/test/CodeGen/XCore/shedulingPreference.ll

@@ -0,0 +1,25 @@
+; RUN: llc < %s -march=xcore
+
+define void @f( ) {
+entry:
+
+  switch i32 undef, label %default [
+    i32 0, label %start
+  ]
+
+start:
+  br label %end
+
+default:
+  %arg = fadd double undef, undef
+  %res = call double @f2(i32 undef, double %arg, double undef)
+  br label %end
+
+end:
+  %unused = phi double [ %res, %default ], [ undef, %start ]
+
+  unreachable
+}
+
+declare double @f2(i32, double, double)
+