TableGen'erated MC lowering for simple pseudo-instructions.

This allows the (many) pseudo-instructions we have that map onto a single
real instruction to have their expansion during MC lowering handled
automatically instead of the current cumbersome manual expansion required.
These sorts of pseudos are common when an instruction is used in situations
that require different MachineInstr flags (isTerminator, isBranch, et. al.)
than the generic instruction description has. For example, using a move
to the PC to implement a branch.

llvm-svn: 134704

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/utils/TableGen/TableGen.cpp b/llvm/utils/TableGen/TableGen.cpp
index ce16c9a..e8eacb8 100644
--- a/llvm/utils/TableGen/TableGen.cpp
+++ b/llvm/utils/TableGen/TableGen.cpp
@@ -33,6 +33,7 @@
 #include "LLVMCConfigurationEmitter.h"
 #include "NeonEmitter.h"
 #include "OptParserEmitter.h"
+#include "PseudoLoweringEmitter.h"
 #include "Record.h"
 #include "RegisterInfoEmitter.h"
 #include "ARMDecoderEmitter.h"
@@ -59,6 +60,7 @@ enum ActionType {
   GenAsmMatcher,
   GenARMDecoder,
   GenDisassembler,
+  GenPseudoLowering,
   GenCallingConv,
   GenClangAttrClasses,
   GenClangAttrImpl,
@@ -106,6 +108,8 @@ namespace {
                                "Generate decoders for ARM/Thumb"),
                     clEnumValN(GenDisassembler, "gen-disassembler",
                                "Generate disassembler"),
+                    clEnumValN(GenPseudoLowering, "gen-pseudo-lowering",
+                               "Generate pseudo instruction lowering"),
                     clEnumValN(GenAsmMatcher, "gen-asm-matcher",
                                "Generate assembly instruction matcher"),
                     clEnumValN(GenDAGISel, "gen-dag-isel",
@@ -314,6 +318,9 @@ int main(int argc, char **argv) {
     case GenDisassembler:
       DisassemblerEmitter(Records).run(Out.os());
       break;
+    case GenPseudoLowering:
+      PseudoLoweringEmitter(Records).run(Out.os());
+      break;
     case GenOptParserDefs:
       OptParserEmitter(Records, true).run(Out.os());
       break;