[llvm] [AMDGPU] Remove unused functions for checking 16-bit inline literals (PR #81282)

[Shilei Tian via llvm-commits]

https://github.com/shiltian created https://github.com/llvm/llvm-project/pull/81282

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


>From cc19406c259bc48a6610d87b9a9c8f4ca9e4cab3 Mon Sep 17 00:00:00 2001
From: Shilei Tian <i at tianshilei.me>
Date: Fri, 9 Feb 2024 12:24:03 -0500
Subject: [PATCH] [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.
---
 llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h          | 4 ----
 llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp | 4 ----
 llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h   | 1 -
 llvm/lib/Target/AMDGPU/SIInstrInfo.td                | 4 ----
 4 files changed, 13 deletions(-)

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h b/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h
index 3b42d88df0c246..6f743c8f4ad62b 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h
@@ -107,10 +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());
   }
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp b/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
index 5657880279962b..d4e9aaf4bce46b 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
@@ -5746,10 +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());
 }
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h b/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
index ef7630f137aca6..afd88055faaeb0 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
@@ -353,7 +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;
diff --git a/llvm/lib/Target/AMDGPU/SIInstrInfo.td b/llvm/lib/Target/AMDGPU/SIInstrInfo.td
index 22599773d562cb..5569c6b1ad9af5 100644
--- a/llvm/lib/Target/AMDGPU/SIInstrInfo.td
+++ b/llvm/lib/Target/AMDGPU/SIInstrInfo.td
@@ -797,10 +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);
 }]>;