[llvm] r227987 - R600/SI: Determine target-specific encoding of READLANE and WRITELANE early v2

[Marek Olsak]

Author: mareko
Date: Tue Feb  3 11:37:57 2015
New Revision: 227987

URL: http://llvm.org/viewvc/llvm-project?rev=227987&view=rev
Log:
R600/SI: Determine target-specific encoding of READLANE and WRITELANE early v2

These are VOP2 on SI and VOP3 on VI, and their pseudos are neither, which can
be a problem. In order to make isVOP2 and isVOP3 queries behave as expected,
the encoding must be determined first.

This doesn't fix any known issue, but better safe than sorry.

v2: add and use getMCOpcodeFromPseudo

Tested-by: Michel Dänzer <michel.daenzer at amd.com>

Modified:
    llvm/trunk/lib/Target/R600/AMDGPUInstrInfo.h
    llvm/trunk/lib/Target/R600/SIRegisterInfo.cpp

Modified: llvm/trunk/lib/Target/R600/AMDGPUInstrInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/R600/AMDGPUInstrInfo.h?rev=227987&r1=227986&r2=227987&view=diff
==============================================================================
--- llvm/trunk/lib/Target/R600/AMDGPUInstrInfo.h (original)
+++ llvm/trunk/lib/Target/R600/AMDGPUInstrInfo.h Tue Feb  3 11:37:57 2015
@@ -140,6 +140,12 @@ public:
   /// not exist. If Opcode is not a pseudo instruction, this is identity.
   int pseudoToMCOpcode(int Opcode) const;
 
+  /// \brief Return the descriptor of the target-specific machine instruction
+  /// that corresponds to the specified pseudo or native opcode.
+  const MCInstrDesc &getMCOpcodeFromPseudo(unsigned Opcode) const {
+    return get(pseudoToMCOpcode(Opcode));
+  }
+
 //===---------------------------------------------------------------------===//
 // Pure virtual funtions to be implemented by sub-classes.
 //===---------------------------------------------------------------------===//

Modified: llvm/trunk/lib/Target/R600/SIRegisterInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/R600/SIRegisterInfo.cpp?rev=227987&r1=227986&r2=227987&view=diff
==============================================================================
--- llvm/trunk/lib/Target/R600/SIRegisterInfo.cpp (original)
+++ llvm/trunk/lib/Target/R600/SIRegisterInfo.cpp Tue Feb  3 11:37:57 2015
@@ -204,7 +204,9 @@ void SIRegisterInfo::eliminateFrameIndex
            Ctx.emitError("Ran out of VGPRs for spilling SGPR");
         }
 
-        BuildMI(*MBB, MI, DL, TII->get(AMDGPU::V_WRITELANE_B32), Spill.VGPR)
+        BuildMI(*MBB, MI, DL,
+                TII->getMCOpcodeFromPseudo(AMDGPU::V_WRITELANE_B32),
+                Spill.VGPR)
                 .addReg(SubReg)
                 .addImm(Spill.Lane);
 
@@ -236,7 +238,9 @@ void SIRegisterInfo::eliminateFrameIndex
         if (isM0)
           SubReg = RS->scavengeRegister(&AMDGPU::SGPR_32RegClass, MI, 0);
 
-        BuildMI(*MBB, MI, DL, TII->get(AMDGPU::V_READLANE_B32), SubReg)
+        BuildMI(*MBB, MI, DL,
+                TII->getMCOpcodeFromPseudo(AMDGPU::V_READLANE_B32),
+                SubReg)
                 .addReg(Spill.VGPR)
                 .addImm(Spill.Lane)
                 .addReg(MI->getOperand(0).getReg(), RegState::ImplicitDefine);