[AMDGPU][MC] Fix for Bug 30829 + LIT tests

Added code to check constant bus restrictions for VOP formats (only one SGPR value or literal-constant may be used by the instruction).
Note that the same checks are performed by SIInstrInfo::verifyInstruction (used by lowering code).
Added LIT tests.

llvm-svn: 296873

2 files changed, 23 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
index cdcc0f08177..de0fda4be6f 100644
--- a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
@@ -547,6 +547,25 @@ unsigned getMCReg(unsigned Reg, const MCSubtargetInfo &STI) {
   return Reg;
 }
 
+unsigned mc2PseudoReg(unsigned Reg) {
+  switch (Reg) {
+  case AMDGPU::FLAT_SCR_ci:
+  case AMDGPU::FLAT_SCR_vi:
+    return FLAT_SCR;
+
+  case AMDGPU::FLAT_SCR_LO_ci:
+  case AMDGPU::FLAT_SCR_LO_vi:
+    return AMDGPU::FLAT_SCR_LO;
+
+  case AMDGPU::FLAT_SCR_HI_ci:
+  case AMDGPU::FLAT_SCR_HI_vi:
+    return AMDGPU::FLAT_SCR_HI;
+
+  default:
+    return Reg;
+  }
+}
+
 bool isSISrcOperand(const MCInstrDesc &Desc, unsigned OpNo) {
   assert(OpNo < Desc.NumOperands);
   unsigned OpType = Desc.OpInfo[OpNo].OperandType;
diff --git a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h
index c20a2093755..96171562ebe 100644
--- a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h
+++ b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h
@@ -263,6 +263,10 @@ bool isVI(const MCSubtargetInfo &STI);
 /// \p STI otherwise return \p Reg.
 unsigned getMCReg(unsigned Reg, const MCSubtargetInfo &STI);
 
+/// \brief Convert hardware register \p Reg to a pseudo register
+LLVM_READNONE
+unsigned mc2PseudoReg(unsigned Reg);
+
 /// \brief Can this operand also contain immediate values?
 bool isSISrcOperand(const MCInstrDesc &Desc, unsigned OpNo);