[AArch64][Clang] Fixed to use __builtin_roundeven

Change-Id: Ibfe830cf69e3ea10f68f651e5a5d507769792496

Author: Blue-Dot

clang/include/clang/Basic/BuiltinsAArch64.def

@@ -110,10 +110,6 @@ BUILTIN(__builtin_arm_tcommit, "v", "n")
 BUILTIN(__builtin_arm_tcancel, "vWUIi", "n")
 BUILTIN(__builtin_arm_ttest, "WUi", "nc")
 
-// Floating point round to integral intrinsics
-BUILTIN(__builtin_arm_rintn, "dd", "g")
-BUILTIN(__builtin_arm_rintnf, "ff", "g")
-
 // Armv8.5-A FP rounding intrinsics
 TARGET_BUILTIN(__builtin_arm_rint32zf, "ff", "", "v8.5a")
 TARGET_BUILTIN(__builtin_arm_rint32z, "dd", "", "v8.5a")

clang/lib/CodeGen/CGBuiltin.cpp

@@ -10219,13 +10219,6 @@ Value *CodeGenFunction::EmitAArch64BuiltinExpr(unsigned BuiltinID,
                               "cls");
   }
 
-  if (BuiltinID == clang::AArch64::BI__builtin_arm_rintn ||
-      BuiltinID == clang::AArch64::BI__builtin_arm_rintnf) {
-    llvm::Value *Arg = EmitScalarExpr(E->getArg(0));
-    return Builder.CreateCall(
-        CGM.getIntrinsic(Intrinsic::roundeven, Arg->getType()), Arg, "rintn");
-  }
-
   if (BuiltinID == clang::AArch64::BI__builtin_arm_rint32zf ||
       BuiltinID == clang::AArch64::BI__builtin_arm_rint32z) {
     llvm::Value *Arg = EmitScalarExpr(E->getArg(0));

clang/lib/Headers/arm_acle.h

@@ -598,12 +598,12 @@ __smusdx(int16x2_t __a, int16x2_t __b) {
   (defined(__ARM_64BIT_STATE) && __ARM_64BIT_STATE)
 static __inline__ double __attribute__((__always_inline__, __nodebug__))
 __rintn(double __a) {
-  return __builtin_arm_rintn(__a);
+  return __builtin_roundeven(__a);
 }
 
 static __inline__ float __attribute__((__always_inline__, __nodebug__))
 __rintnf(float __a) {
-  return __builtin_arm_rintnf(__a);
+  return __builtin_roundevenf(__a);
 }
 #endif