Compute a map from register names to registers, rather than scanning the list of registers every time we want to look up a register by name.

llvm-svn: 163659

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/utils/TableGen/CodeGenRegisters.cpp b/llvm/utils/TableGen/CodeGenRegisters.cpp
index 931807ae44b..f195b4e3fa9 100644
--- a/llvm/utils/TableGen/CodeGenRegisters.cpp
+++ b/llvm/utils/TableGen/CodeGenRegisters.cpp
@@ -993,6 +993,12 @@ CodeGenRegBank::CodeGenRegBank(RecordKeeper &Records) {
   for (unsigned i = 0, e = Registers.size(); i != e; ++i)
     Registers[i]->buildObjectGraph(*this);
 
+  // Compute register name map.
+  for (unsigned i = 0, e = Registers.size(); i != e; ++i)
+    RegistersByName.GetOrCreateValue(
+                       Registers[i]->TheDef->getValueAsString("AsmName"),
+                       Registers[i]);
+
   // Precompute all sub-register maps.
   // This will create Composite entries for all inferred sub-register indices.
   for (unsigned i = 0, e = Registers.size(); i != e; ++i)