[AMDGPU][llvm-mc] s_getreg/setreg* - Add hwreg(...) syntax.

Added hwreg(reg[,offset,width]) syntax.
Default offset = 0, default width = 32.
Possibility to specify 16-bit immediate kept.
Added out-of-range checks.
Disassembling is always to hwreg(...) format.
Tests updated/added.

Differential Revision: http://reviews.llvm.org/D19329

llvm-svn: 267410

1 files changed, 14 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/InstPrinter/AMDGPUInstPrinter.cpp b/llvm/lib/Target/AMDGPU/InstPrinter/AMDGPUInstPrinter.cpp
index 0bdff1af82c..e02bc90e89c 100644
--- a/llvm/lib/Target/AMDGPU/InstPrinter/AMDGPUInstPrinter.cpp
+++ b/llvm/lib/Target/AMDGPU/InstPrinter/AMDGPUInstPrinter.cpp
@@ -760,4 +760,18 @@ void AMDGPUInstPrinter::printWaitFlag(const MCInst *MI, unsigned OpNo,
   }
 }
 
+void AMDGPUInstPrinter::printHwreg(const MCInst *MI, unsigned OpNo,
+                                   raw_ostream &O) {
+  unsigned SImm16 = MI->getOperand(OpNo).getImm();
+  const unsigned HwRegCode = SImm16 & 0x3F;
+  const unsigned Offset = (SImm16 >> 6) & 0x1f;
+  const unsigned Width = ((SImm16 >> 11) & 0x1F) + 1;
+
+  if (Width == 32 && Offset == 0) {
+    O << "hwreg(" << HwRegCode << ')';
+  } else {
+    O << "hwreg(" << HwRegCode << ", " << Offset << ", " << Width << ')';
+  }
+}
+
 #include "AMDGPUGenAsmWriter.inc"