4684ddb6aa
- import libcxx - reduce targets to the one when compiled as a tools Change-Id: Iabb8427f80ff8e89463559a28bcb8b4f2bdbc496
37 lines
993 B
ArmAsm
37 lines
993 B
ArmAsm
//===------- bswapdi2 - Implement bswapdi2 --------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is dual licensed under the MIT and the University of Illinois Open
|
|
// Source Licenses. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "../assembly.h"
|
|
|
|
//
|
|
// extern uint64_t __bswapdi2(uint64_t);
|
|
//
|
|
// Reverse all the bytes in a 64-bit integer.
|
|
//
|
|
.align 2
|
|
DEFINE_COMPILERRT_FUNCTION(__bswapdi2)
|
|
#if __ARM_ARCH_5TEJ__ || __ARM_ARCH_4T__
|
|
// 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)
|
|
bx lr
|