R600/SI: Print code size along with used register

[arsenm]

Summary

Only prints it in the comment. Doesn't emit the value in the binary since I don't know what to do for that

[arsenm]

r206336

lib/Target/R600/AMDGPUAsmPrinter.h

 class AMDGPUAsmPrinter : public AsmPrinter {
 private:
   struct SIProgramInfo {
-    SIProgramInfo() : NumSGPR(0), NumVGPR(0) {}
+    SIProgramInfo() :
+      CodeLen(0),
+      NumSGPR(0),
+      NumVGPR(0) {}
+
+    uint64_t CodeLen;
     unsigned NumSGPR;
     unsigned NumVGPR;
   };

lib/Target/R600/AMDGPUAsmPrinter.cpp

   const AMDGPUSubtarget &STM = TM.getSubtarget<AMDGPUSubtarget>();
   SIProgramInfo KernelInfo;
   if (STM.getGeneration() > AMDGPUSubtarget::NORTHERN_ISLANDS) {
-    findNumUsedRegistersSI(MF, KernelInfo.NumSGPR, KernelInfo.NumVGPR);
+    getSIProgramInfo(KernelInfo, MF);
     EmitProgramInfoSI(MF, KernelInfo);
   } else {
     EmitProgramInfoR600(MF);

                               SectionKind::getReadOnly());
     OutStreamer.SwitchSection(CommentSection);
 
-    if (STM.getGeneration() > AMDGPUSubtarget::NORTHERN_ISLANDS) {
+    if (STM.getGeneration() >= AMDGPUSubtarget::SOUTHERN_ISLANDS) {
       OutStreamer.emitRawComment(" Kernel info:", false);
+      OutStreamer.emitRawComment(" codeLenInByte = " + Twine(KernelInfo.CodeLen),
+                                 false);
       OutStreamer.emitRawComment(" NumSgprs: " + Twine(KernelInfo.NumSGPR),
                                  false);
       OutStreamer.emitRawComment(" NumVgprs: " + Twine(KernelInfo.NumVGPR),

   }
 }
 
-void AMDGPUAsmPrinter::findNumUsedRegistersSI(MachineFunction &MF,
-                                              unsigned &NumSGPR,
-                                              unsigned &NumVGPR) const {
+void AMDGPUAsmPrinter::getSIProgramInfo(SIProgramInfo &ProgInfo,
+                                        MachineFunction &MF) const {
+  uint64_t CodeSize = 0;
   unsigned MaxSGPR = 0;
   unsigned MaxVGPR = 0;
   bool VCCUsed = false;

                                                     I != E; ++I) {
       MachineInstr &MI = *I;
 
+      // TODO: CodeSize should account for multiple functions.
+      CodeSize += MI.getDesc().Size;
+
       unsigned numOperands = MI.getNumOperands();
       for (unsigned op_idx = 0; op_idx < numOperands; op_idx++) {
         MachineOperand &MO = MI.getOperand(op_idx);

   if (VCCUsed)
     MaxSGPR += 2;
 
-  NumSGPR = MaxSGPR;
-  NumVGPR = MaxVGPR;
-}
-
-void AMDGPUAsmPrinter::getSIProgramInfo(SIProgramInfo &Out,
-                                        MachineFunction &MF) const {
-  findNumUsedRegistersSI(MF, Out.NumSGPR, Out.NumVGPR);
+  ProgInfo.CodeLen = CodeSize;
+  ProgInfo.NumSGPR = MaxSGPR;
+  ProgInfo.NumVGPR = MaxVGPR;
 }
 
 void AMDGPUAsmPrinter::EmitProgramInfoSI(MachineFunction &MF,

   }
 
   OutStreamer.EmitIntValue(RsrcReg, 4);
+
+  // TODO: Emit code size.
   OutStreamer.EmitIntValue(S_00B028_VGPRS(KernelInfo.NumVGPR / 4) |
                            S_00B028_SGPRS(KernelInfo.NumSGPR / 8), 4);