[AMDGPU] Remove unused VGPRSingleUseHintInsts feature (#109769)

Author: ScottEgerton

llvm/docs/AMDGPUUsage.rst

@@ -611,9 +611,7 @@ Generic processor code objects are versioned. See :ref:`amdgpu-generic-processor
                                                                                                 - ``gfx1152``
 
                                                                                                 SALU floating point instructions
-                                                                                                and single-use VGPR hint
-                                                                                                instructions are not available
-                                                                                                on:
+                                                                                                are not available on:
 
                                                                                                 - ``gfx1150``
                                                                                                 - ``gfx1151``

llvm/lib/Target/AMDGPU/AMDGPU.h

@@ -405,9 +405,6 @@ extern char &SIModeRegisterID;
 void initializeAMDGPUInsertDelayAluPass(PassRegistry &);
 extern char &AMDGPUInsertDelayAluID;
 
-void initializeAMDGPUInsertSingleUseVDSTPass(PassRegistry &);
-extern char &AMDGPUInsertSingleUseVDSTID;
-
 void initializeSIInsertHardClausesPass(PassRegistry &);
 extern char &SIInsertHardClausesID;
 

llvm/lib/Target/AMDGPU/AMDGPU.td

@@ -929,12 +929,6 @@ def FeatureSALUFloatInsts : SubtargetFeature<"salu-float",
   "Has SALU floating point instructions"
 >;
 
-def FeatureVGPRSingleUseHintInsts : SubtargetFeature<"vgpr-singleuse-hint",
-  "HasVGPRSingleUseHintInsts",
-  "true",
-  "Has single-use VGPR hint instructions"
->;
-
 def FeaturePseudoScalarTrans : SubtargetFeature<"pseudo-scalar-trans",
   "HasPseudoScalarTrans",
   "true",
@@ -1615,22 +1609,19 @@ def FeatureISAVersion11_5_0 : FeatureSet<
   !listconcat(FeatureISAVersion11_Common.Features,
     [FeatureSALUFloatInsts,
      FeatureDPPSrc1SGPR,
-     FeatureVGPRSingleUseHintInsts,
      FeatureRequiredExportPriority])>;
 
 def FeatureISAVersion11_5_1 : FeatureSet<
   !listconcat(FeatureISAVersion11_Common.Features,
     [FeatureSALUFloatInsts,
      FeatureDPPSrc1SGPR,
-     FeatureVGPRSingleUseHintInsts,
      Feature1_5xVGPRs,
      FeatureRequiredExportPriority])>;
 
 def FeatureISAVersion11_5_2 : FeatureSet<
   !listconcat(FeatureISAVersion11_Common.Features,
     [FeatureSALUFloatInsts,
      FeatureDPPSrc1SGPR,
-     FeatureVGPRSingleUseHintInsts,
      FeatureRequiredExportPriority])>;
 
 def FeatureISAVersion12 : FeatureSet<
@@ -1663,7 +1654,6 @@ def FeatureISAVersion12 : FeatureSet<
    FeatureSALUFloatInsts,
    FeaturePseudoScalarTrans,
    FeatureHasRestrictedSOffset,
-   FeatureVGPRSingleUseHintInsts,
    FeatureScalarDwordx3Loads,
    FeatureDPPSrc1SGPR,
    FeatureMaxHardClauseLength32,
@@ -2271,9 +2261,6 @@ def HasNotMADIntraFwdBug : Predicate<"!Subtarget->hasMADIntraFwdBug()">;
 def HasSALUFloatInsts : Predicate<"Subtarget->hasSALUFloatInsts()">,
   AssemblerPredicate<(all_of FeatureSALUFloatInsts)>;
 
-def HasVGPRSingleUseHintInsts : Predicate<"Subtarget->hasVGPRSingleUseHintInsts()">,
-  AssemblerPredicate<(all_of FeatureVGPRSingleUseHintInsts)>;
-
 def HasPseudoScalarTrans : Predicate<"Subtarget->hasPseudoScalarTrans()">,
   AssemblerPredicate<(all_of FeaturePseudoScalarTrans)>;
 

llvm/lib/Target/AMDGPU/AMDGPUInsertSingleUseVDST.cpp

@@ -311,12 +311,6 @@ static cl::opt<bool> EnableSIModeRegisterPass(
   cl::init(true),
   cl::Hidden);
 
-// Enable GFX11.5+ s_singleuse_vdst insertion
-static cl::opt<bool>
-    EnableInsertSingleUseVDST("amdgpu-enable-single-use-vdst",
-                              cl::desc("Enable s_singleuse_vdst insertion"),
-                              cl::init(false), cl::Hidden);
-
 // Enable GFX11+ s_delay_alu insertion
 static cl::opt<bool>
     EnableInsertDelayAlu("amdgpu-enable-delay-alu",
@@ -450,7 +444,6 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAMDGPUTarget() {
   initializeAMDGPURewriteUndefForPHILegacyPass(*PR);
   initializeAMDGPUUnifyMetadataPass(*PR);
   initializeSIAnnotateControlFlowLegacyPass(*PR);
-  initializeAMDGPUInsertSingleUseVDSTPass(*PR);
   initializeAMDGPUInsertDelayAluPass(*PR);
   initializeSIInsertHardClausesPass(*PR);
   initializeSIInsertWaitcntsPass(*PR);
@@ -1518,9 +1511,6 @@ void GCNPassConfig::addPreEmitPass() {
   // cases.
   addPass(&PostRAHazardRecognizerID);
 
-  if (isPassEnabled(EnableInsertSingleUseVDST, CodeGenOptLevel::Less))
-    addPass(&AMDGPUInsertSingleUseVDSTID);
-
   if (isPassEnabled(EnableInsertDelayAlu, CodeGenOptLevel::Less))
     addPass(&AMDGPUInsertDelayAluID);
 

llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

@@ -81,7 +81,6 @@ add_llvm_target(AMDGPUCodeGen
   AMDGPUMCInstLower.cpp
   AMDGPUMemoryUtils.cpp
   AMDGPUIGroupLP.cpp
-  AMDGPUInsertSingleUseVDST.cpp
   AMDGPUMarkLastScratchLoad.cpp
   AMDGPUMIRFormatter.cpp
   AMDGPUOpenCLEnqueuedBlockLowering.cpp

llvm/lib/Target/AMDGPU/CMakeLists.txt

@@ -215,7 +215,6 @@ class GCNSubtarget final : public AMDGPUGenSubtargetInfo,
   bool HasPackedTID = false;
   bool ScalarizeGlobal = false;
   bool HasSALUFloatInsts = false;
-  bool HasVGPRSingleUseHintInsts = false;
   bool HasPseudoScalarTrans = false;
   bool HasRestrictedSOffset = false;
 
@@ -1280,8 +1279,6 @@ class GCNSubtarget final : public AMDGPUGenSubtargetInfo,
 
   bool hasSALUFloatInsts() const { return HasSALUFloatInsts; }
 
-  bool hasVGPRSingleUseHintInsts() const { return HasVGPRSingleUseHintInsts; }
-
   bool hasPseudoScalarTrans() const { return HasPseudoScalarTrans; }
 
   bool hasRestrictedSOffset() const { return HasRestrictedSOffset; }

llvm/lib/Target/AMDGPU/GCNSubtarget.h

@@ -2409,8 +2409,6 @@ class VOPProfile <list<ValueType> _ArgVT, bit _EnableClamp = 0> {
   field bit EnableClamp = _EnableClamp;
   field bit IsTrue16 = 0;
   field bit IsRealTrue16 = 0;
-  field bit IsInvalidSingleUseConsumer = 0;
-  field bit IsInvalidSingleUseProducer = 0;
 
   field ValueType DstVT = ArgVT[0];
   field ValueType Src0VT = ArgVT[1];