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llvm-project/compiler-rt/lib/builtins/arm/bswapdi2.S

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Marginally smaller implementations of bswap for ARMv4, ARMv5 that avoid the need to establish a frame llvm-svn: 107555
2010-07-03 09:00:49 +08:00
//===------- bswapdi2 - Implement bswapdi2 --------------------------------===//
add comparison functions for ARM llvm-svn: 81597
2009-09-12 09:23:48 +08:00
//
// The LLVM Compiler Infrastructure
//
license change llvm-svn: 119397
2010-11-17 06:13:33 +08:00
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
add comparison functions for ARM llvm-svn: 81597
2009-09-12 09:23:48 +08:00
//
//===----------------------------------------------------------------------===//
Add assembly.h for use in .S files. llvm-svn: 85263
2009-10-28 01:49:50 +08:00
#include "../assembly.h"
add comparison functions for ARM llvm-svn: 81597
2009-09-12 09:23:48 +08:00
compiler-rt: whitespace and uniformity for arm Make the whitespace a bit more uniform in the various assembly routines. This also makes the assembly files a bit more uniform on the ARM side by explicitly stating that it is using the unified syntax and that the contents of the code is in the text section (or segment). No functional change. llvm-svn: 209985
2014-06-01 12:07:03 +08:00
.syntax unified
.text
compiler-rt: prefer thumb over ARM When possible, use Thumb or Thumb-2 over ARM instructions. This is particularly important for pure-Thumb environments (e.g. Windows on ARM). Although, it is possible to conditionalise this for that target specifically, this is available on most newer ARM CPUs, and the code remains compatible with older CPUs with no adverse effects. It therefore feels better to always prefer Thumb when possible. llvm-svn: 211032
2014-06-17 00:05:24 +08:00
#if __ARM_ARCH_ISA_THUMB == 2
.thumb
#endif
compiler-rt: whitespace and uniformity for arm Make the whitespace a bit more uniform in the various assembly routines. This also makes the assembly files a bit more uniform on the ARM side by explicitly stating that it is using the unified syntax and that the contents of the code is in the text section (or segment). No functional change. llvm-svn: 209985
2014-06-01 12:07:03 +08:00
add comparison functions for ARM llvm-svn: 81597
2009-09-12 09:23:48 +08:00
//
// extern uint64_t __bswapdi2(uint64_t);
//
// Reverse all the bytes in a 64-bit integer.
//
compiler-rt: whitespace and uniformity for arm Make the whitespace a bit more uniform in the various assembly routines. This also makes the assembly files a bit more uniform on the ARM side by explicitly stating that it is using the unified syntax and that the contents of the code is in the text section (or segment). No functional change. llvm-svn: 209985
2014-06-01 12:07:03 +08:00
.p2align 2
builtins: rework use of DEFINE_COMPILERRT_THUMB_FUNCTION This is simply to help clarity of the code. The functions are built as thumb only if Thumb2 is available (__ARM_ARCH_ISA_THUMB == 2). Sink the selection into the location of the definition and make DEFINE_COMPILERRT_THUMB_FUNCTION always define a thumb function while DEFINE_COMPILERRT_FUNCTION always selects the default. Since the .thumb_func directive is always available (at least on Linux, Windows, and BSD), sinking the macro right into the macro works just as well. No functional change intended. llvm-svn: 219182
2014-10-07 10:39:13 +08:00
#if __ARM_ARCH_ISA_THUMB == 2
Fix the armv7 thumb builtins on darwin The arm builtins converted into thumb in r213481 are not working on darwin. On apple platforms, .thumb_func directive is required to generated correct symbols for thumb functions. <rdar://problem/18523605> llvm-svn: 219040
2014-10-04 08:18:59 +08:00
DEFINE_COMPILERRT_THUMB_FUNCTION(__bswapdi2)
builtins: rework use of DEFINE_COMPILERRT_THUMB_FUNCTION This is simply to help clarity of the code. The functions are built as thumb only if Thumb2 is available (__ARM_ARCH_ISA_THUMB == 2). Sink the selection into the location of the definition and make DEFINE_COMPILERRT_THUMB_FUNCTION always define a thumb function while DEFINE_COMPILERRT_FUNCTION always selects the default. Since the .thumb_func directive is always available (at least on Linux, Windows, and BSD), sinking the macro right into the macro works just as well. No functional change intended. llvm-svn: 219182
2014-10-07 10:39:13 +08:00
#else
DEFINE_COMPILERRT_FUNCTION(__bswapdi2)
#endif
Support ARMv4 in the remaining non-VFP routines. llvm-svn: 200397
2014-01-29 21:54:54 +08:00
#if __ARM_ARCH < 6
Further cleanup of ARM bswap implementations, thanks to John Tytgat llvm-svn: 107576
2010-07-04 05:47:50 +08:00
// 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
ARM before armv6 did not supprt 'rev' instruction llvm-svn: 107548
2010-07-03 08:12:47 +08:00
#else
Further cleanup of ARM bswap implementations, thanks to John Tytgat llvm-svn: 107576
2010-07-04 05:47:50 +08:00
rev r2, r0 // r2 = rev(r0)
rev r0, r1 // r0 = rev(r1)
ARM before armv6 did not supprt 'rev' instruction llvm-svn: 107548
2010-07-03 08:12:47 +08:00
#endif
Further cleanup of ARM bswap implementations, thanks to John Tytgat llvm-svn: 107576
2010-07-04 05:47:50 +08:00
mov r1, r2 // r1 = r2 = rev(r0)
Support ARMv4 in the remaining non-VFP routines. llvm-svn: 200397
2014-01-29 21:54:54 +08:00
JMP(lr)
Mechanically add end-of-function markers. llvm-svn: 200005
2014-01-24 22:33:42 +08:00
END_COMPILERRT_FUNCTION(__bswapdi2)