[ConstantFold] Don't mention irrelevant opcodes (NFCI)

This is folding an icmp, so fptrunc, fpext, uitofp, sitofp cannot
appear here at all. Also drop the explicit checks for trunc, fptoui,
fptosi, which can appear, but are just some random subset of opcodes
that are not handled by this code.

1 files changed, 1 insertions, 10 deletions

diff --git a/llvm/lib/IR/ConstantFold.cpp b/llvm/lib/IR/ConstantFold.cpp
index 151bd0c..1d77857 100644
--- a/llvm/lib/IR/ConstantFold.cpp
+++ b/llvm/lib/IR/ConstantFold.cpp
@@ -1243,22 +1243,13 @@ static ICmpInst::Predicate evaluateICmpRelation(Constant *V1, Constant *V2,
     Constant *CE1Op0 = CE1->getOperand(0);
 
     switch (CE1->getOpcode()) {
-    case Instruction::Trunc:
-    case Instruction::FPTrunc:
-    case Instruction::FPExt:
-    case Instruction::FPToUI:
-    case Instruction::FPToSI:
-      break; // We can't evaluate floating point casts or truncations.
-
     case Instruction::BitCast:
       // If this is a global value cast, check to see if the RHS is also a
       // GlobalValue.
       if (const GlobalValue *GV = dyn_cast<GlobalValue>(CE1Op0))
         if (const GlobalValue *GV2 = dyn_cast<GlobalValue>(V2))
           return areGlobalsPotentiallyEqual(GV, GV2);
-      [[fallthrough]];
-    case Instruction::UIToFP:
-    case Instruction::SIToFP:
+
       // We can't evaluate floating point casts or truncations.
       if (CE1Op0->getType()->isFPOrFPVectorTy())
         break;