diff --git a/src/compiler/enums.h b/src/compiler/enums.h
index a87a76342..aa740c77f 100644
--- a/src/compiler/enums.h
+++ b/src/compiler/enums.h
@@ -762,6 +762,7 @@ typedef enum
 	BUILTIN_MEMCOPY,
 	BUILTIN_MEMSET,
 	BUILTIN_SYSCALL,
+	BUILTIN_SYSCLOCK,
 	BUILTIN_NONE,
 	NUMBER_OF_BUILTINS = BUILTIN_NONE,
 } BuiltinFunction;
diff --git a/src/compiler/llvm_codegen.c b/src/compiler/llvm_codegen.c
index 9336e0d0b..89e2fd688 100644
--- a/src/compiler/llvm_codegen.c
+++ b/src/compiler/llvm_codegen.c
@@ -617,6 +617,8 @@ void llvm_codegen_setup()
 	intrinsic_id.umax = lookup_intrinsic("llvm.umax");
 	intrinsic_id.umin = lookup_intrinsic("llvm.umin");
 
+	intrinsic_id.readcyclecounter = lookup_intrinsic("llvm.readcyclecounter");
+
 	intrinsic_id.memset = lookup_intrinsic("llvm.memset");
 	intrinsic_id.memcpy = lookup_intrinsic("llvm.memcpy");
 
diff --git a/src/compiler/llvm_codegen_expr.c b/src/compiler/llvm_codegen_expr.c
index e5ed6b582..db9079de3 100644
--- a/src/compiler/llvm_codegen_expr.c
+++ b/src/compiler/llvm_codegen_expr.c
@@ -4154,6 +4154,7 @@ static void llvm_emit_intrinsic_expr(GenContext *c, unsigned intrinsic, BEValue
 	{
 		call_args = 1;
 		call_type[0] = llvm_get_type(c, expr->type);
+		if (intrinsic == intrinsic_id.readcyclecounter) call_args = 0;
 	}
 	else if (intrinsic == intrinsic_id.memcpy)
 	{
@@ -4344,6 +4345,8 @@ unsigned llvm_get_intrinsic(BuiltinFunction func)
 		case BUILTIN_UNREACHABLE:
 		case BUILTIN_STACKTRACE:
 			UNREACHABLE
+		case BUILTIN_SYSCLOCK:
+			return intrinsic_id.readcyclecounter;
 		case BUILTIN_TRAP:
 			return intrinsic_id.trap;
 		case BUILTIN_CEIL:
diff --git a/src/compiler/llvm_codegen_internal.h b/src/compiler/llvm_codegen_internal.h
index 445b517c2..79c4f13de 100644
--- a/src/compiler/llvm_codegen_internal.h
+++ b/src/compiler/llvm_codegen_internal.h
@@ -178,6 +178,7 @@ typedef struct
 	unsigned lifetime_end;
 	unsigned memcpy;
 	unsigned memset;
+	unsigned readcyclecounter;
 } LLVMIntrinsics;
 
 extern LLVMIntrinsics intrinsic_id;
diff --git a/src/compiler/sema_expr.c b/src/compiler/sema_expr.c
index d67aec8d6..746843389 100644
--- a/src/compiler/sema_expr.c
+++ b/src/compiler/sema_expr.c
@@ -2293,6 +2293,7 @@ static inline unsigned builtin_expected_args(BuiltinFunction func)
 		case BUILTIN_UNREACHABLE:
 		case BUILTIN_TRAP:
 		case BUILTIN_STACKTRACE:
+		case BUILTIN_SYSCLOCK:
 			return 0;
 		case BUILTIN_SYSCALL:
 		case BUILTIN_CEIL:
@@ -2454,6 +2455,9 @@ static inline bool sema_expr_analyse_builtin_call(SemaContext *context, Expr *ex
 		case BUILTIN_TRAP:
 			rtype = type_void;
 			break;
+		case BUILTIN_SYSCLOCK:
+			rtype = type_ulong;
+			break;
 		case BUILTIN_SYSCALL:
 			if (arg_count > 7)
 			{
diff --git a/src/compiler/symtab.c b/src/compiler/symtab.c
index d98ee9bba..5212329d6 100644
--- a/src/compiler/symtab.c
+++ b/src/compiler/symtab.c
@@ -177,6 +177,7 @@ void symtab_init(uint32_t capacity)
 	kw_mainstub = KW_DEF("_$mainstub");
 
 	builtin_list[BUILTIN_TRAP] = KW_DEF("trap");
+	builtin_list[BUILTIN_SYSCLOCK] = KW_DEF("sysclock");
 	builtin_list[BUILTIN_UNREACHABLE] = KW_DEF("unreachable");
 	builtin_list[BUILTIN_STACKTRACE] = KW_DEF("stacktrace");
 	builtin_list[BUILTIN_CEIL] = KW_DEF("ceil");