In bottom-up mode, defer the materialization of local constant values.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103139 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 078e5fd..9cc6f1b 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -84,6 +84,17 @@
if (Reg != 0)
return Reg;
+ // In bottom-up mode, just create the virtual register which will be used
+ // to hold the value. It will be materialized later.
+ if (IsBottomUp) {
+ Reg = createResultReg(TLI.getRegClassFor(VT));
+ if (isa<Instruction>(V))
+ ValueMap[V] = Reg;
+ else
+ LocalValueMap[V] = Reg;
+ return Reg;
+ }
+
return materializeRegForValue(V, VT);
}