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//===------- bswapsi2 - Implement bswapsi2 --------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "../assembly.h"
//
// extern uint32_t __bswapsi2(uint32_t);
//
// Reverse all the bytes in a 32-bit integer.
//
.align 2
DEFINE_COMPILERRT_FUNCTION(__bswapsi2)
#if __ARM_ARCH_5TEJ__ || __ARM_ARCH_4T__
// before armv6 does not have "rev" instruction
mov r1, #0xff00
and r2, r1, r0, lsr #8
and r1, r1, r0
orr r2, r2, r0, lsr #24
orr r2, r2, r0, lsl #24
orr r0, r2, r1, lsl #8
#else
rev r0, r0 // reverse bytes in parameter and put into result register
#endif
bx lr
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