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ARM: Use own lj_bswap(). Reduce min. req. version of GCC to 4.2.

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This commit is contained in:
Mike Pall 2011-04-28 12:33:31 +02:00
parent 5d096dcfde
commit 0b606061db
3 changed files with 30 additions and 4 deletions
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4
doc/install.html
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@ -123,8 +123,8 @@ operating system, CPU and compilers:
</tr>
<tr class="odd">
<td class="compatcpu">ARM</td>
<td class="compatos">GCC 4.3+</td>
<td class="compatos">GCC 4.3+</td>
<td class="compatos">GCC 4.2+</td>
<td class="compatos">GCC 4.2+</td>
<td class="compatos compatno">&nbsp;</td>
<td class="compatos compatno">&nbsp;</td>
</tr>

6
src/lj_arch.h
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@ -173,7 +173,11 @@
#if __GNUC__ < 4
#error "Need at least GCC 4.0 or newer"
#endif
#elif LJ_TARGET_ARM || LJ_TARGET_PPC
#elif LJ_TARGET_ARM
#if (__GNUC__ < 4) || ((__GNUC__ == 4) && __GNUC_MINOR__ < 2)
#error "Need at least GCC 4.2 or newer"
#endif
#elif LJ_TARGET_PPC
#if (__GNUC__ < 4) || ((__GNUC__ == 4) && __GNUC_MINOR__ < 3)
#error "Need at least GCC 4.3 or newer"
#endif

24
src/lj_def.h
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@ -131,7 +131,29 @@ static LJ_AINLINE uint32_t lj_fls(uint32_t x)
#define lj_fls(x) ((uint32_t)(__builtin_clz(x)^31))
#endif
#if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
#if defined(__arm__)
static LJ_AINLINE uint32_t lj_bswap(uint32_t x)
{
uint32_t r;
#if __ARM_ARCH_6__ || __ARM_ARCH_6J__ || __ARM_ARCH_6T2__ || __ARM_ARCH_6Z__ ||\
__ARM_ARCH_7__ || __ARM_ARCH_7A__ || __ARM_ARCH_7R__
__asm__("rev %0, %1" : "=r" (r) : "r" (x));
return r;
#else
#ifdef __thumb__
r = x ^ lj_ror(x, 16);
#else
__asm__("eor %0, %1, %1, ror #16" : "=r" (r) : "r" (x));
#endif
return ((r & 0xff00ffffu) >> 8) ^ lj_ror(x, 8);
#endif
}
static LJ_AINLINE uint64_t lj_bswap64(uint64_t x)
{
return ((uint64_t)lj_bswap((uint32_t)x)<<32) | lj_bswap((uint32_t)(x>>32));
}
#elif (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
static LJ_AINLINE uint32_t lj_bswap(uint32_t x)
{
return (uint32_t)__builtin_bswap32((int32_t)x);