AArch64: Support for __builtin_arm_rbit() and __builtin_arm_rbit64().

__builtin_arm_rbit() and __builtin_arm_rbit64().

rdar://9283021

llvm-svn: 211060

clang/include/clang/Basic/BuiltinsAArch64.def

@@ -21,6 +21,10 @@ BUILTIN(__builtin_arm_ldrex, "v.", "t")
 BUILTIN(__builtin_arm_strex, "i.", "t")
 BUILTIN(__builtin_arm_clrex, "v", "")
 
+// Bit manipulation
+BUILTIN(__builtin_arm_rbit, "UiUi", "nc")
+BUILTIN(__builtin_arm_rbit64, "LUiLUi", "nc")
+
 // CRC32
 BUILTIN(__builtin_arm_crc32b, "UiUiUc", "nc")
 BUILTIN(__builtin_arm_crc32cb, "UiUiUc", "nc")

clang/lib/CodeGen/CGBuiltin.cpp

@@ -3763,6 +3763,21 @@ emitVectorWrappedScalar16Intrinsic(unsigned Int, SmallVectorImpl<Value*> &Ops,
 
 Value *CodeGenFunction::EmitAArch64BuiltinExpr(unsigned BuiltinID,
                                                const CallExpr *E) {
+  if (BuiltinID == AArch64::BI__builtin_arm_rbit) {
+    assert((getContext().getTypeSize(E->getType()) == 32) &&
+           "rbit of unusual size!");
+    llvm::Value *Arg = EmitScalarExpr(E->getArg(0));
+    return Builder.CreateCall(
+        CGM.getIntrinsic(Intrinsic::aarch64_rbit, Arg->getType()), Arg, "rbit");
+  }
+  if (BuiltinID == AArch64::BI__builtin_arm_rbit64) {
+    assert((getContext().getTypeSize(E->getType()) == 64) &&
+           "rbit of unusual size!");
+    llvm::Value *Arg = EmitScalarExpr(E->getArg(0));
+    return Builder.CreateCall(
+        CGM.getIntrinsic(Intrinsic::aarch64_rbit, Arg->getType()), Arg, "rbit");
+  }
+
   if (BuiltinID == AArch64::BI__clear_cache) {
     assert(E->getNumArgs() == 2 && "__clear_cache takes 2 arguments");
     const FunctionDecl *FD = E->getDirectCallee();

clang/test/CodeGen/builtins-arm64.c

@@ -4,3 +4,13 @@ void f0(void *a, void *b) {
 	__clear_cache(a,b);
 // CHECK: call {{.*}} @__clear_cache
 }
+
+// CHECK: call {{.*}} @llvm.aarch64.rbit.i32(i32 %a)
+void rbit(unsigned a) {
+  __builtin_arm_rbit(a);
+}
+
+// CHECK: call {{.*}} @llvm.aarch64.rbit.i64(i64 %a)
+void rbit64(unsigned long long a) {
+  __builtin_arm_rbit64(a);
+}