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Re: bitrotate
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From: |
Paolo Bonzini |
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Subject: |
Re: bitrotate |
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Date: |
Thu, 28 Aug 2008 17:32:00 +0200 |
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User-agent: |
Thunderbird 2.0.0.16 (Macintosh/20080707) |
> +#define rotl32(x,n) \
> + ((((x) << ((uint16_t)(n))) | ((x) >> (32 - (uint16_t)(n)))) & 0xFFFFFFFF)
> +#define rotr32(x,n) \
> + ((((x) >> ((uint16_t)(n))) | ((x) << (32 - (uint16_t)(n)))) & 0xFFFFFFFF)
> +#define rotl16(x,n) \
> + ((((x) << ((uint16_t)(n))) | ((x) >> (16 - (uint16_t)(n)))) & 0xFFFF)
> +#define rotr16(x,n) \
> + ((((x) >> ((uint16_t)(n))) | ((x) << (16 - (uint16_t)(n)))) & 0xFFFF)
If you don't cast x to uint32_t or uint16_t the compiler won't be able
to recognize the rotate pattern.
Paolo