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Re: [avr-gcc-list] Re: AVR byte swap optimization
From: |
Shaun Jackman |
Subject: |
Re: [avr-gcc-list] Re: AVR byte swap optimization |
Date: |
Mon, 18 Dec 2006 14:57:07 -0700 |
On 12/18/06, Anton Erasmus <address@hidden> wrote:
Hi,
Not a macro, but the following seems to generate reasonable code.
...
Thanks Anton,
I came to the same conclusion.
Cheers,
Shaun
static inline uint16_t bswap_16_inline(uint16_t x)
{
union {
uint16_t x;
struct {
uint8_t a;
uint8_t b;
} s;
} in, out;
in.x = x;
out.s.a = in.s.b;
out.s.b = in.s.a;
return out.x;
}
static inline uint32_t bswap_32_inline(uint32_t x)
{
union {
uint32_t x;
struct {
uint8_t a;
uint8_t b;
uint8_t c;
uint8_t d;
} s;
} in, out;
in.x = x;
out.s.a = in.s.d;
out.s.b = in.s.c;
out.s.c = in.s.b;
out.s.d = in.s.a;
return out.x;
}