[SelectionDAGBuilder] Fuse inline asm input operand loops passes. NFCI.

llvm-svn: 352053

1 files changed, 9 insertions, 13 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 8c17162c86d..f22ca4b55c3 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -7605,19 +7605,6 @@ void SelectionDAGBuilder::visitInlineAsm(ImmutableCallSite CS) {
 
   }
 
-  // Third pass - Loop over all of the operands, assigning virtual or physregs
-  // to register class operands.
-  for (SDISelAsmOperandInfo &OpInfo : ConstraintOperands) {
-    SDISelAsmOperandInfo &RefOpInfo =
-        OpInfo.isMatchingInputConstraint()
-            ? ConstraintOperands[OpInfo.getMatchedOperand()]
-            : OpInfo;
-
-    if (RefOpInfo.ConstraintType == TargetLowering::C_Register ||
-        RefOpInfo.ConstraintType == TargetLowering::C_RegisterClass)
-      GetRegistersForValue(DAG, getCurSDLoc(), OpInfo, RefOpInfo);
-  }
-
   // AsmNodeOperands - The operands for the ISD::INLINEASM node.
   std::vector<SDValue> AsmNodeOperands;
   AsmNodeOperands.push_back(SDValue());  // reserve space for input chain
@@ -7635,7 +7622,16 @@ void SelectionDAGBuilder::visitInlineAsm(ImmutableCallSite CS) {
   AsmNodeOperands.push_back(DAG.getTargetConstant(
       ExtraInfo.get(), getCurSDLoc(), TLI.getPointerTy(DAG.getDataLayout())));
 
+  // Third pass: Loop over operands to prepare DAG-level operands.. As part of
+  // this, assign virtual and physical registers for inputs and otput.
   for (SDISelAsmOperandInfo &OpInfo : ConstraintOperands) {
+    // Assign Registers.
+    SDISelAsmOperandInfo &RefOpInfo =
+        OpInfo.isMatchingInputConstraint()
+            ? ConstraintOperands[OpInfo.getMatchedOperand()]
+            : OpInfo;
+    GetRegistersForValue(DAG, getCurSDLoc(), OpInfo, RefOpInfo);
+
     switch (OpInfo.Type) {
     case InlineAsm::isOutput:
       if (OpInfo.ConstraintType != TargetLowering::C_RegisterClass &&