Factor out FastISel's code for materializing constants and other values
in registers into a separate function to de-couple it from the
top-down-specific logic in getRegForValue.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102975 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/llvm/CodeGen/FastISel.h b/include/llvm/CodeGen/FastISel.h
index 2eb2df2..5a2b0e7 100644
--- a/include/llvm/CodeGen/FastISel.h
+++ b/include/llvm/CodeGen/FastISel.h
@@ -311,6 +311,11 @@
/// might result in multiple MBB's for one BB. As such, the start of the
/// BB might correspond to a different MBB than the end.
bool HandlePHINodesInSuccessorBlocks(const BasicBlock *LLVMBB);
+
+ /// materializeRegForValue - Helper for getRegForVale. This function is
+ /// called when the value isn't already available in a register and must
+ /// be materialized with new instructions.
+ unsigned materializeRegForValue(const Value *V, MVT VT);
};
}
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 49bfbff..b4c3833 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -84,6 +84,15 @@
if (Reg != 0)
return Reg;
+ return materializeRegForValue(V, VT);
+}
+
+/// materializeRegForValue - Helper for getRegForVale. This function is
+/// called when the value isn't already available in a register and must
+/// be materialized with new instructions.
+unsigned FastISel::materializeRegForValue(const Value *V, MVT VT) {
+ unsigned Reg = 0;
+
if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
if (CI->getValue().getActiveBits() <= 64)
Reg = FastEmit_i(VT, VT, ISD::Constant, CI->getZExtValue());
@@ -141,7 +150,7 @@
// Look up the value to see if we already have a register for it. We
// cache values defined by Instructions across blocks, and other values
// only locally. This is because Instructions already have the SSA
- // def-dominatess-use requirement enforced.
+ // def-dominates-use requirement enforced.
if (ValueMap.count(V))
return ValueMap[V];
return LocalValueMap[V];