[AMDGPU] Remove unused functions for checking 16-bit inline literals

This patch removes unused functions that check if an immediate is a 16-bit inline
literals. This serves as prime patches to fix llvm#79369.

Author: shiltian

llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp

@@ -327,7 +327,7 @@ bool AMDGPUDAGToDAGISel::isInlineImmediate(const SDNode *N) const {
     return TII->isInlineConstant(C->getAPIntValue());
 
   if (const ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N))
-    return TII->isInlineConstant(C->getValueAPF().bitcastToAPInt());
+    return TII->isInlineConstant(C->getValueAPF());
 
   return false;
 }

llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h

@@ -105,18 +105,11 @@ class AMDGPUDAGToDAGISel : public SelectionDAGISel {
 
 private:
   std::pair<SDValue, SDValue> foldFrameIndex(SDValue N) const;
-  bool isInlineImmediate(const SDNode *N) const;
-
-  bool isInlineImmediate16(int64_t Imm) const {
-    return AMDGPU::isInlinableLiteral16(Imm, Subtarget->hasInv2PiInlineImm());
-  }
 
-  bool isInlineImmediate32(int64_t Imm) const {
-    return AMDGPU::isInlinableLiteral32(Imm, Subtarget->hasInv2PiInlineImm());
-  }
+  bool isInlineImmediate(const SDNode *N) const;
 
-  bool isInlineImmediate64(int64_t Imm) const {
-    return AMDGPU::isInlinableLiteral64(Imm, Subtarget->hasInv2PiInlineImm());
+  bool isInlineImmediate(const APInt &Imm) const {
+    return Subtarget->getInstrInfo()->isInlineConstant(Imm);
   }
 
   bool isInlineImmediate(const APFloat &Imm) const {

llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp

@@ -5746,16 +5746,8 @@ void AMDGPUInstructionSelector::renderFPPow2ToExponent(MachineInstrBuilder &MIB,
   MIB.addImm(ExpVal);
 }
 
-bool AMDGPUInstructionSelector::isInlineImmediate16(int64_t Imm) const {
-  return AMDGPU::isInlinableLiteral16(Imm, STI.hasInv2PiInlineImm());
-}
-
-bool AMDGPUInstructionSelector::isInlineImmediate32(int64_t Imm) const {
-  return AMDGPU::isInlinableLiteral32(Imm, STI.hasInv2PiInlineImm());
-}
-
-bool AMDGPUInstructionSelector::isInlineImmediate64(int64_t Imm) const {
-  return AMDGPU::isInlinableLiteral64(Imm, STI.hasInv2PiInlineImm());
+bool AMDGPUInstructionSelector::isInlineImmediate(const APInt &Imm) const {
+  return TII.isInlineConstant(Imm);
 }
 
 bool AMDGPUInstructionSelector::isInlineImmediate(const APFloat &Imm) const {

llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h

@@ -353,9 +353,7 @@ class AMDGPUInstructionSelector final : public InstructionSelector {
   void renderFPPow2ToExponent(MachineInstrBuilder &MIB, const MachineInstr &MI,
                               int OpIdx) const;
 
-  bool isInlineImmediate16(int64_t Imm) const;
-  bool isInlineImmediate32(int64_t Imm) const;
-  bool isInlineImmediate64(int64_t Imm) const;
+  bool isInlineImmediate(const APInt &Imm) const;
   bool isInlineImmediate(const APFloat &Imm) const;
 
   // Returns true if TargetOpcode::G_AND MachineInstr `MI`'s masking of the

llvm/lib/Target/AMDGPU/SIInstrInfo.td

@@ -797,16 +797,8 @@ def i64imm_32bit : ImmLeaf<i64, [{
   return (Imm & 0xffffffffULL) == static_cast<uint64_t>(Imm);
 }]>;
 
-def InlineImm16 : ImmLeaf<i16, [{
-  return isInlineImmediate16(Imm);
-}]>;
-
-def InlineImm32 : ImmLeaf<i32, [{
-  return isInlineImmediate32(Imm);
-}]>;
-
 def InlineImm64 : ImmLeaf<i64, [{
-  return isInlineImmediate64(Imm);
+  return isInlineImmediate(APInt(64, static_cast<uint64_t>(Imm)));
 }]>;
 
 def InlineImmFP32 : FPImmLeaf<f32, [{