R600: rework handling of the constants

Remove Cxxx registers, add new special register - "ALU_CONST" and new
operand for each alu src - "sel". ALU_CONST is used to designate that the
new operand contains the value to override src.sel, src.kc_bank, src.chan
for constants in the driver.

Patch by: Vadim Girlin

Vincent Lejeune:
  - Use pointers for constants
  - Fold CONST_ADDRESS when possible

Tom Stellard:
  - Give CONSTANT_BUFFER_0 its own address space
  - Use integer types for constant loads

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
llvm-svn: 173222

2 files changed, 25 insertions, 0 deletions

diff --git a/llvm/lib/Target/R600/InstPrinter/AMDGPUInstPrinter.cpp b/llvm/lib/Target/R600/InstPrinter/AMDGPUInstPrinter.cpp
index e6c550b5ac4..e76c6c86757 100644
--- a/llvm/lib/Target/R600/InstPrinter/AMDGPUInstPrinter.cpp
+++ b/llvm/lib/Target/R600/InstPrinter/AMDGPUInstPrinter.cpp
@@ -129,4 +129,28 @@ void AMDGPUInstPrinter::printWrite(const MCInst *MI, unsigned OpNo,
   }
 }
 
+void AMDGPUInstPrinter::printSel(const MCInst *MI, unsigned OpNo,
+                                  raw_ostream &O) {
+  const char * chans = "XYZW";
+  int sel = MI->getOperand(OpNo).getImm();
+
+  int chan = sel & 3;
+  sel >>= 2;
+
+  if (sel >= 512) {
+    sel -= 512;
+    int cb = sel >> 12;
+    sel &= 4095;
+    O << cb << "[" << sel << "]";
+  } else if (sel >= 448) {
+    sel -= 448;
+    O << sel;
+  } else if (sel >= 0){
+    O << sel;
+  }
+
+  if (sel >= 0)
+    O << "." << chans[chan];
+}
+
 #include "AMDGPUGenAsmWriter.inc"
diff --git a/llvm/lib/Target/R600/InstPrinter/AMDGPUInstPrinter.h b/llvm/lib/Target/R600/InstPrinter/AMDGPUInstPrinter.h
index 96e0e46f8a6..e775c4c82e7 100644
--- a/llvm/lib/Target/R600/InstPrinter/AMDGPUInstPrinter.h
+++ b/llvm/lib/Target/R600/InstPrinter/AMDGPUInstPrinter.h
@@ -45,6 +45,7 @@ private:
   void printUpdateExecMask(const MCInst *MI, unsigned OpNo, raw_ostream &O);
   void printUpdatePred(const MCInst *MI, unsigned OpNo, raw_ostream &O);
   void printWrite(const MCInst *MI, unsigned OpNo, raw_ostream &O);
+  void printSel(const MCInst *MI, unsigned OpNo, raw_ostream &O);
 };
 
 } // End namespace llvm