Revert "[DXIL] Add radians intrinsic (#110616)"

This reverts commit 1e75d08.

Author: bogner

llvm/include/llvm/IR/IntrinsicsDirectX.td

@@ -86,5 +86,4 @@ def int_dx_rsqrt  : DefaultAttrsIntrinsic<[llvm_anyfloat_ty], [LLVMMatchType<0>]
 def int_dx_wave_is_first_lane : DefaultAttrsIntrinsic<[llvm_i1_ty], [], [IntrConvergent]>;
 def int_dx_sign : DefaultAttrsIntrinsic<[LLVMScalarOrSameVectorWidth<0, llvm_i32_ty>], [llvm_any_ty], [IntrNoMem]>;
 def int_dx_step : DefaultAttrsIntrinsic<[LLVMMatchType<0>], [llvm_anyfloat_ty, LLVMMatchType<0>], [IntrNoMem]>;
-def int_dx_radians : DefaultAttrsIntrinsic<[llvm_anyfloat_ty], [LLVMMatchType<0>], [IntrNoMem]>;
 }

llvm/lib/Target/DirectX/DXILIntrinsicExpansion.cpp

@@ -64,7 +64,6 @@ static bool isIntrinsicExpansion(Function &F) {
   case Intrinsic::dx_udot:
   case Intrinsic::dx_sign:
   case Intrinsic::dx_step:
-  case Intrinsic::dx_radians:
     return true;
   }
   return false;
@@ -443,14 +442,6 @@ static Value *expandStepIntrinsic(CallInst *Orig) {
   return Builder.CreateSelect(Cond, Zero, One);
 }
 
-static Value *expandRadiansIntrinsic(CallInst *Orig) {
-  Value *X = Orig->getOperand(0);
-  Type *Ty = X->getType();
-  IRBuilder<> Builder(Orig);
-  Value *PiOver180 = ConstantFP::get(Ty, llvm::numbers::pi / 180.0);
-  return Builder.CreateFMul(X, PiOver180);
-}
-
 static Intrinsic::ID getMaxForClamp(Type *ElemTy,
                                     Intrinsic::ID ClampIntrinsic) {
   if (ClampIntrinsic == Intrinsic::dx_uclamp)
@@ -570,9 +561,6 @@ static bool expandIntrinsic(Function &F, CallInst *Orig) {
     break;
   case Intrinsic::dx_step:
     Result = expandStepIntrinsic(Orig);
-  case Intrinsic::dx_radians:
-    Result = expandRadiansIntrinsic(Orig);
-    break;
   }
   if (Result) {
     Orig->replaceAllUsesWith(Result);