GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/trusted-firmware/trusted-firmware-a-2.8/lib/compiler-rt/builtins/lshrdi3.c

@@ -0,0 +1,38 @@
+//===-- lshrdi3.c - Implement __lshrdi3 -----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __lshrdi3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: logical a >> b
+
+// Precondition:  0 <= b < bits_in_dword
+
+COMPILER_RT_ABI di_int __lshrdi3(di_int a, int b) {
+  const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT);
+  udwords input;
+  udwords result;
+  input.all = a;
+  if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */ {
+    result.s.high = 0;
+    result.s.low = input.s.high >> (b - bits_in_word);
+  } else /* 0 <= b < bits_in_word */ {
+    if (b == 0)
+      return a;
+    result.s.high = input.s.high >> b;
+    result.s.low = (input.s.high << (bits_in_word - b)) | (input.s.low >> b);
+  }
+  return result.all;
+}
+
+#if defined(__ARM_EABI__)
+COMPILER_RT_ALIAS(__lshrdi3, __aeabi_llsr)
+#endif