1 files changed, 43 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/arm/bswapdi2.S b/contrib/llvm-project/compiler-rt/lib/builtins/arm/bswapdi2.S
new file mode 100644
index 000000000000..271df8bd6ad0
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/arm/bswapdi2.S
@@ -0,0 +1,43 @@
+//===------- bswapdi2 - Implement bswapdi2 --------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "../assembly.h"
+
+	.syntax unified
+	.text
+	DEFINE_CODE_STATE
+
+//
+// extern uint64_t __bswapdi2(uint64_t);
+//
+// Reverse all the bytes in a 64-bit integer.
+//
+	.p2align 2
+DEFINE_COMPILERRT_FUNCTION(__bswapdi2)
+#if __ARM_ARCH < 6
+    // before armv6 does not have "rev" instruction
+    // r2 = rev(r0)
+    eor r2, r0, r0, ror #16
+    bic r2, r2, #0xff0000
+    mov r2, r2, lsr #8
+    eor r2, r2, r0, ror #8
+    // r0 = rev(r1)
+    eor r0, r1, r1, ror #16
+    bic r0, r0, #0xff0000
+    mov r0, r0, lsr #8
+    eor r0, r0, r1, ror #8
+#else
+    rev r2, r0  // r2 = rev(r0)
+    rev r0, r1  // r0 = rev(r1)
+#endif
+    mov r1, r2  // r1 = r2 = rev(r0)
+    JMP(lr)
+END_COMPILERRT_FUNCTION(__bswapdi2)
+
+NO_EXEC_STACK_DIRECTIVE
+