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bswapsi2.S revision 1.1.1.3 
      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 
     12 	.syntax unified
     13 	.text
     14 #if __ARM_ARCH_ISA_THUMB == 2
     15 	.thumb
     16 #endif
     17 
     18 //
     19 // extern uint32_t __bswapsi2(uint32_t);
     20 //
     21 // Reverse all the bytes in a 32-bit integer.
     22 //
     23 	.p2align 2
     24 DEFINE_COMPILERRT_FUNCTION(__bswapsi2)
     25 #if __ARM_ARCH < 6
     26     // before armv6 does not have "rev" instruction
     27  	eor	r1, r0, r0, ror #16
     28  	bic	r1, r1, #0xff0000
     29  	mov	r1, r1, lsr #8
     30  	eor	r0, r1, r0, ror #8
     31 #else
     32     rev r0, r0
     33 #endif
     34     JMP(lr)
     35 END_COMPILERRT_FUNCTION(__bswapsi2)
     36