[Mesa-dev] [PATCH 1/3] R600: Emit used GPRs count

[Vincent Lejeune]

---
 lib/Target/R600/AMDGPUAsmPrinter.cpp | 35 +++++++++++++++++++++++++++++++++--
 lib/Target/R600/AMDGPUAsmPrinter.h   |  3 ++-
 2 files changed, 35 insertions(+), 3 deletions(-)

diff --git a/lib/Target/R600/AMDGPUAsmPrinter.cpp b/lib/Target/R600/AMDGPUAsmPrinter.cpp
index dacb033..580cfb4 100644
--- a/lib/Target/R600/AMDGPUAsmPrinter.cpp
+++ b/lib/Target/R600/AMDGPUAsmPrinter.cpp
@@ -21,6 +21,7 @@
 #include "AMDGPU.h"
 #include "SIMachineFunctionInfo.h"
 #include "SIRegisterInfo.h"
+#include "R600RegisterInfo.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Target/TargetLoweringObjectFile.h"
@@ -52,13 +53,43 @@ bool AMDGPUAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   }
   OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
   if (STM.device()->getGeneration() > AMDGPUDeviceInfo::HD6XXX) {
-    EmitProgramInfo(MF);
+    EmitProgramInfoSI(MF);
+  } else {
+    EmitProgramInfoR600(MF);
   }
   EmitFunctionBody();
   return false;
 }
 
-void AMDGPUAsmPrinter::EmitProgramInfo(MachineFunction &MF) {
+void AMDGPUAsmPrinter::EmitProgramInfoR600(MachineFunction &MF) {
+  unsigned MaxGPR = 0;
+  const R600RegisterInfo * RI =
+                static_cast<const R600RegisterInfo*>(TM.getRegisterInfo());
+
+  for (MachineFunction::iterator BB = MF.begin(), BB_E = MF.end();
+                                                  BB != BB_E; ++BB) {
+    MachineBasicBlock &MBB = *BB;
+    for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
+                                                    I != E; ++I) {
+      MachineInstr &MI = *I;
+      unsigned numOperands = MI.getNumOperands();
+      for (unsigned op_idx = 0; op_idx < numOperands; op_idx++) {
+        MachineOperand & MO = MI.getOperand(op_idx);
+        if (!MO.isReg())
+          continue;
+        unsigned HWReg = RI->getEncodingValue(MO.getReg()) & 0xff;
+
+        // Register with value > 127 aren't GPR
+        if (HWReg > 127)
+          continue;
+        MaxGPR = std::max(MaxGPR, HWReg);
+      }
+    }
+  }
+  OutStreamer.EmitIntValue(MaxGPR + 1, 4);
+}
+
+void AMDGPUAsmPrinter::EmitProgramInfoSI(MachineFunction &MF) {
   unsigned MaxSGPR = 0;
   unsigned MaxVGPR = 0;
   bool VCCUsed = false;
diff --git a/lib/Target/R600/AMDGPUAsmPrinter.h b/lib/Target/R600/AMDGPUAsmPrinter.h
index 3812282..f425ef4 100644
--- a/lib/Target/R600/AMDGPUAsmPrinter.h
+++ b/lib/Target/R600/AMDGPUAsmPrinter.h
@@ -33,7 +33,8 @@ public:
 
   /// \brief Emit register usage information so that the GPU driver
   /// can correctly setup the GPU state.
-  void EmitProgramInfo(MachineFunction &MF);
+  void EmitProgramInfoR600(MachineFunction &MF);
+  void EmitProgramInfoSI(MachineFunction &MF);
 
   /// Implemented in AMDGPUMCInstLower.cpp
   virtual void EmitInstruction(const MachineInstr *MI);
-- 
1.8.1.4