Machine-Level Implementation

Author: linuxrocks123

llvm/lib/Target/AMDGPU/AMDGPU.h

@@ -39,6 +39,7 @@ FunctionPass *createSIAnnotateControlFlowLegacyPass();
 FunctionPass *createSIFoldOperandsLegacyPass();
 FunctionPass *createSIPeepholeSDWALegacyPass();
 FunctionPass *createSILowerI1CopiesLegacyPass();
+FunctionPass *createSISAbs16FixupLegacyPass();
 FunctionPass *createSIShrinkInstructionsLegacyPass();
 FunctionPass *createSILoadStoreOptimizerLegacyPass();
 FunctionPass *createSIWholeQuadModeLegacyPass();
@@ -93,6 +94,13 @@ class SILowerI1CopiesPass : public PassInfoMixin<SILowerI1CopiesPass> {
                         MachineFunctionAnalysisManager &MFAM);
 };
 
+class SISAbs16FixupPass : public PassInfoMixin<SISAbs16FixupPass> {
+public:
+  SISAbs16FixupPass() = default;
+  PreservedAnalyses run(MachineFunction &MF,
+                        MachineFunctionAnalysisManager &MFAM);
+};
+
 void initializeAMDGPUDAGToDAGISelLegacyPass(PassRegistry &);
 
 void initializeAMDGPUAlwaysInlinePass(PassRegistry&);
@@ -197,6 +205,9 @@ extern char &SILowerWWMCopiesLegacyID;
 void initializeSILowerI1CopiesLegacyPass(PassRegistry &);
 extern char &SILowerI1CopiesLegacyID;
 
+void initializeSISAbs16FixupLegacyPass(PassRegistry &);
+extern char &SISAbs16FixupLegacyID;
+
 void initializeAMDGPUGlobalISelDivergenceLoweringPass(PassRegistry &);
 extern char &AMDGPUGlobalISelDivergenceLoweringID;
 

llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

@@ -551,6 +551,7 @@ extern "C" LLVM_ABI LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAMDGPUTarget() {
   initializeAMDGPUPrepareAGPRAllocLegacyPass(*PR);
   initializeGCNDPPCombineLegacyPass(*PR);
   initializeSILowerI1CopiesLegacyPass(*PR);
+  initializeSISAbs16FixupLegacyPass(*PR);
   initializeAMDGPUGlobalISelDivergenceLoweringPass(*PR);
   initializeAMDGPURegBankSelectPass(*PR);
   initializeAMDGPURegBankLegalizePass(*PR);
@@ -1517,6 +1518,7 @@ bool GCNPassConfig::addInstSelector() {
   AMDGPUPassConfig::addInstSelector();
   addPass(&SIFixSGPRCopiesLegacyID);
   addPass(createSILowerI1CopiesLegacyPass());
+  addPass(createSISAbs16FixupLegacyPass());
   return false;
 }
 
@@ -2209,6 +2211,7 @@ Error AMDGPUCodeGenPassBuilder::addInstSelector(AddMachinePass &addPass) const {
   addPass(AMDGPUISelDAGToDAGPass(TM));
   addPass(SIFixSGPRCopiesPass());
   addPass(SILowerI1CopiesPass());
+  addPass(SISAbs16FixupPass());
   return Error::success();
 }
 

llvm/lib/Target/AMDGPU/CMakeLists.txt

@@ -185,6 +185,7 @@ add_llvm_target(AMDGPUCodeGen
   SIPreEmitPeephole.cpp
   SIProgramInfo.cpp
   SIRegisterInfo.cpp
+  SISAbs16Fixup.cpp
   SIShrinkInstructions.cpp
   SIWholeQuadMode.cpp