2010-07-03 09:00:49 +08:00
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//===------- bswapsi2 - Implement bswapsi2 --------------------------------===//
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2009-09-12 09:23:48 +08:00
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//
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// The LLVM Compiler Infrastructure
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//
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2010-11-17 06:13:33 +08:00
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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2009-09-12 09:23:48 +08:00
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//
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//===----------------------------------------------------------------------===//
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2009-10-28 01:49:50 +08:00
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#include "../assembly.h"
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2009-09-12 09:23:48 +08:00
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//
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// extern uint32_t __bswapsi2(uint32_t);
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//
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2009-09-14 02:34:39 +08:00
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// Reverse all the bytes in a 32-bit integer.
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2009-09-12 09:23:48 +08:00
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//
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2010-07-04 05:47:50 +08:00
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.align 2
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2009-10-28 01:50:21 +08:00
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DEFINE_COMPILERRT_FUNCTION(__bswapsi2)
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2010-07-03 08:12:47 +08:00
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#if __ARM_ARCH_5TEJ__ || __ARM_ARCH_4T__
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2010-07-04 05:47:50 +08:00
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// before armv6 does not have "rev" instruction
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eor r1, r0, r0, ror #16
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bic r1, r1, #0xff0000
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mov r1, r1, lsr #8
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eor r0, r1, r0, ror #8
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2010-07-03 08:12:47 +08:00
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#else
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2010-07-04 05:47:50 +08:00
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rev r0, r0
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2010-07-03 08:12:47 +08:00
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#endif
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2010-07-04 05:47:50 +08:00
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bx lr
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