[MCInstPrinter] Enable MCInstPrinter to change its behavior based on the

per-function subtarget.

Currently, code-gen passes the default or generic subtarget to the constructors
of MCInstPrinter subclasses (see LLVMTargetMachine::addPassesToEmitFile), which
enables some targets (AArch64, ARM, and X86) to change their instprinter's
behavior based on the subtarget feature bits. Since the backend can now use
different subtargets for each function, instprinter has to be changed to use the
per-function subtarget rather than the default subtarget.

This patch takes the first step towards enabling instprinter to change its
behavior based on the per-function subtarget. It adds a bit "PassSubtarget" to
AsmWriter which tells table-gen to pass a reference to MCSubtargetInfo to the
various print methods table-gen auto-generates. 

I will follow up with changes to instprinters of AArch64, ARM, and X86.

llvm-svn: 233411

2 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/Target/R600/InstPrinter/AMDGPUInstPrinter.cpp b/llvm/lib/Target/R600/InstPrinter/AMDGPUInstPrinter.cpp
index d62fd3f5949..d5898d6594e 100644
--- a/llvm/lib/Target/R600/InstPrinter/AMDGPUInstPrinter.cpp
+++ b/llvm/lib/Target/R600/InstPrinter/AMDGPUInstPrinter.cpp
@@ -20,7 +20,7 @@
 using namespace llvm;
 
 void AMDGPUInstPrinter::printInst(const MCInst *MI, raw_ostream &OS,
-                             StringRef Annot) {
+                                  StringRef Annot, const MCSubtargetInfo &STI) {
   OS.flush();
   printInstruction(MI, OS);
 
diff --git a/llvm/lib/Target/R600/InstPrinter/AMDGPUInstPrinter.h b/llvm/lib/Target/R600/InstPrinter/AMDGPUInstPrinter.h
index 52897185d8f..9633e4c0332 100644
--- a/llvm/lib/Target/R600/InstPrinter/AMDGPUInstPrinter.h
+++ b/llvm/lib/Target/R600/InstPrinter/AMDGPUInstPrinter.h
@@ -29,7 +29,8 @@ public:
   void printInstruction(const MCInst *MI, raw_ostream &O);
   static const char *getRegisterName(unsigned RegNo);
 
-  void printInst(const MCInst *MI, raw_ostream &O, StringRef Annot) override;
+  void printInst(const MCInst *MI, raw_ostream &O, StringRef Annot,
+                 const MCSubtargetInfo &STI) override;
 
 private:
   void printU8ImmOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O);