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target-arm: A64: add support for 1-src RBIT insn

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This adds support for the C5.6.147 RBIT instruction.

Signed-off-by: Alexander Graf <agraf@suse.de>
[claudio: adapted to new decoder, use bswap64,
          make RBIT part standalone from the rest of the patch,
	  splitting REV into a separate patch]
Signed-off-by: Claudio Fontana <claudio.fontana@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Alexander Graf 2013-12-17 19:42:35 +00:00 • committed by Peter Maydell
parent 680ead216e
commit 82e14b02a2
3 changed files with 39 additions and 0 deletions
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18
target-arm/helper-a64.c
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@ -49,3 +49,21 @@ uint64_t HELPER(clz64)(uint64_t x)
{
return clz64(x);
}
uint64_t HELPER(rbit64)(uint64_t x)
{
/* assign the correct byte position */
x = bswap64(x);
/* assign the correct nibble position */
x = ((x & 0xf0f0f0f0f0f0f0f0ULL) >> 4)
| ((x & 0x0f0f0f0f0f0f0f0fULL) << 4);
/* assign the correct bit position */
x = ((x & 0x8888888888888888ULL) >> 3)
| ((x & 0x4444444444444444ULL) >> 1)
| ((x & 0x2222222222222222ULL) << 1)
| ((x & 0x1111111111111111ULL) << 3);
return x;
}