Revert "[ConstantFold] Fold tgamma and tgammaf when the input parameter is a constant value." (#114496)

Reverts #114065

Author: c8ef

llvm/lib/Analysis/ConstantFolding.cpp

@@ -57,7 +57,6 @@
 #include <cassert>
 #include <cerrno>
 #include <cfenv>
-#include <cfloat>
 #include <cmath>
 #include <cstdint>
 
@@ -1699,9 +1698,9 @@ bool llvm::canConstantFoldCallTo(const CallBase *Call, const Function *F) {
            Name == "sinh" || Name == "sinhf" ||
            Name == "sqrt" || Name == "sqrtf";
   case 't':
-    return Name == "tan" || Name == "tanf" || Name == "tanh" ||
-           Name == "tanhf" || Name == "trunc" || Name == "truncf" ||
-           Name == "tgamma" || Name == "tgammaf";
+    return Name == "tan" || Name == "tanf" ||
+           Name == "tanh" || Name == "tanhf" ||
+           Name == "trunc" || Name == "truncf";
   case '_':
     // Check for various function names that get used for the math functions
     // when the header files are preprocessed with the macro
@@ -2418,14 +2417,6 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
       if (TLI->has(Func))
         return ConstantFoldFP(erf, APF, Ty);
       break;
-    case LibFunc_tgamma:
-    case LibFunc_tgammaf:
-      // NOTE: These boundaries are somewhat conservative.
-      if (TLI->has(Func) &&
-          (Ty->isDoubleTy() && APF > APFloat(DBL_MIN) && APF < APFloat(171.0) ||
-           Ty->isFloatTy() && APF > APFloat(FLT_MIN) && APF < APFloat(35.0f)))
-        return ConstantFoldFP(tgamma, APF, Ty);
-      break;
     case LibFunc_nearbyint:
     case LibFunc_nearbyintf:
     case LibFunc_rint:
@@ -3638,10 +3629,6 @@ bool llvm::isMathLibCallNoop(const CallBase *Call,
       case LibFunc_sqrtf:
         return Op.isNaN() || Op.isZero() || !Op.isNegative();
 
-      case LibFunc_tgamma:
-      case LibFunc_tgammaf:
-        return true;
-
       // FIXME: Add more functions: sqrt_finite, atanh, expm1, log1p,
       // maybe others?
       default: