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@@ -8,24 +8,25 @@
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static __inline__ __u32 ___arch__swab32(__u32 x)
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{
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-#ifdef CONFIG_X86_BSWAP
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__asm__("bswap %0" : "=r" (x) : "0" (x));
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-#else
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- __asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */
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- "rorl $16,%0\n\t" /* swap words */
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- "xchgb %b0,%h0" /* swap higher bytes */
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- :"=q" (x)
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- : "0" (x));
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-#endif
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+
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return x;
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}
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+#define _constant_swab16(x) ((__u16)( \
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+ (((__u16)(x) & (__u16)0x00ffU) << 8) | \
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+ (((__u16)(x) & (__u16)0xff00U) >> 8)))
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+
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static __inline__ __u16 ___arch__swab16(__u16 x)
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{
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+#if CONFIG_IS_ENABLED(X86_64)
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+ return _constant_swab16(x);
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+#else
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__asm__("xchgb %b0,%h0" /* swap bytes */ \
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: "=q" (x) \
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: "0" (x)); \
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return x;
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+#endif
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}
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#define __arch__swab32(x) ___arch__swab32(x)
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