[llvm-c][Disassembler] Add an option to print latency information in

disassembled output alongside the instructions.
E.g., on a vector shuffle operation with a memory operand, disassembled
outputs are:
* Without the option:
    vpshufd $-0x79, (%rsp), %xmm0
    
* With the option:
    vpshufd $-0x79, (%rsp), %xmm0   ## Latency: 5

The printed latency is extracted from the schedule model available in the
disassembler context. Thus, this option has no effect if there is not a
scheduling model for the target.
This boils down to one may need to specify the CPU string, so that this
option could have an effect.

Note: Latency < 2 are not printed.

This part of <rdar://problem/14687488>.

llvm-svn: 191859

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/MC/MCDisassembler/Disassembler.h b/llvm/lib/MC/MCDisassembler/Disassembler.h
index 6eb59d0c57b..05c92dff17c 100644
--- a/llvm/lib/MC/MCDisassembler/Disassembler.h
+++ b/llvm/lib/MC/MCDisassembler/Disassembler.h
@@ -73,6 +73,8 @@ private:
   llvm::OwningPtr<const llvm::MCDisassembler> DisAsm;
   // The instruction printer for the target architecture.
   llvm::OwningPtr<llvm::MCInstPrinter> IP;
+  // The options used to set up the disassembler.
+  uint64_t Options;
 
 public:
   // Comment stream and backing vector.
@@ -90,6 +92,7 @@ public:
                     MCInstPrinter *iP) : TripleName(tripleName),
                     DisInfo(disInfo), TagType(tagType), GetOpInfo(getOpInfo),
                     SymbolLookUp(symbolLookUp), TheTarget(theTarget),
+                    Options(0),
                     CommentStream(CommentsToEmit) {
     MAI.reset(mAI);
     MRI.reset(mRI);
@@ -114,6 +117,8 @@ public:
   const MCSubtargetInfo *getSubtargetInfo() const { return MSI.get(); }
   MCInstPrinter *getIP() { return IP.get(); }
   void setIP(MCInstPrinter *NewIP) { IP.reset(NewIP); }
+  uint64_t getOptions() const { return Options; }
+  void addOptions(uint64_t Options) { this->Options |= Options; }
 };
 
 } // namespace llvm