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-rw-r--r--lib/compiler-rt/builtins/lshrdi3.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/lib/compiler-rt/builtins/lshrdi3.c b/lib/compiler-rt/builtins/lshrdi3.c
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+++ b/lib/compiler-rt/builtins/lshrdi3.c
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+//===-- 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