[rustc.git] / src / libcompiler_builtins / compiler-rt / lib / builtins / arm / bswapsi2.S

//===------- bswapsi2 - Implement bswapsi2 --------------------------------===//
//
//                     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"

	.syntax unified
	.text
	DEFINE_CODE_STATE

//
// extern uint32_t __bswapsi2(uint32_t);
//
// Reverse all the bytes in a 32-bit integer.
//
	.p2align 2
DEFINE_COMPILERRT_FUNCTION(__bswapsi2)
#if __ARM_ARCH < 6
    // before armv6 does not have "rev" instruction
 	eor	r1, r0, r0, ror #16
 	bic	r1, r1, #0xff0000
 	mov	r1, r1, lsr #8
 	eor	r0, r1, r0, ror #8
#else
    rev r0, r0
#endif
    JMP(lr)
END_COMPILERRT_FUNCTION(__bswapsi2)

NO_EXEC_STACK_DIRECTIVE
Commit	Line	Data
1a4d82fc JJ	1	//===------- bswapsi2 - Implement bswapsi2 --------------------------------===//
	2	//
	3	// The LLVM Compiler Infrastructure
	4	//
	5	// This file is dual licensed under the MIT and the University of Illinois Open
	6	// Source Licenses. See LICENSE.TXT for details.
	7	//
	8	//===----------------------------------------------------------------------===//
	9
	10	#include "../assembly.h"
	11
92a42be0 SL	12	.syntax unified
92a42be0 SL	13	.text
2c00a5a8	14	DEFINE_CODE_STATE
92a42be0	15
1a4d82fc JJ	16	//
	17	// extern uint32_t __bswapsi2(uint32_t);
	18	//
	19	// Reverse all the bytes in a 32-bit integer.
	20	//
92a42be0	21	.p2align 2
1a4d82fc JJ	22	DEFINE_COMPILERRT_FUNCTION(__bswapsi2)
	23	#if __ARM_ARCH < 6
	24	// before armv6 does not have "rev" instruction
	25	eor r1, r0, r0, ror #16
	26	bic r1, r1, #0xff0000
	27	mov r1, r1, lsr #8
	28	eor r0, r1, r0, ror #8
	29	#else
	30	rev r0, r0
	31	#endif
	32	JMP(lr)
	33	END_COMPILERRT_FUNCTION(__bswapsi2)
3157f602 XL	34
	35	NO_EXEC_STACK_DIRECTIVE
	36