| Current Path : /usr/src/contrib/compiler-rt/lib/arm/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/contrib/compiler-rt/lib/arm/bswapdi2.S |
//===------- 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