[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 #79369.

Author: shiltian

llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h

@@ -107,14 +107,6 @@ class AMDGPUDAGToDAGISel : public SelectionDAGISel {
   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 isInlineImmediate64(int64_t Imm) const {
     return AMDGPU::isInlinableLiteral64(Imm, Subtarget->hasInv2PiInlineImm());
   }

llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp

@@ -5746,14 +5746,6 @@ 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());
 }

llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h

@@ -353,8 +353,6 @@ 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 APFloat &Imm) const;
 

llvm/lib/Target/AMDGPU/SIInstrInfo.td

@@ -797,14 +797,6 @@ 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);
 }]>;