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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163659 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/utils/TableGen/CodeGenRegisters.cpp b/utils/TableGen/CodeGenRegisters.cpp
index 931807ae44..f195b4e3fa 100644
--- a/utils/TableGen/CodeGenRegisters.cpp
+++ b/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)