Hi, On Wed, 31 Aug 2005, Knut Petersen wrote:
> +static inline void __fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, + > u32 s_pitch, u32 height) > +{ > + int i, j; > + > + if (likely(s_pitch==1)) > + for(i=0; i < height; i++) > + dst[d_pitch*i] = src[i]; > + else if (s_pitch==2) > + for(i=0; i < height; i++) { > + *(u16 *)dst = ((u16 *)src)[i]; > + dst += d_pitch; > + } > + else { > + d_pitch -= s_pitch; > + for (i = height; i--; ) { > + for (j = 0; j < s_pitch; j++) > + *dst++ = *src++; > + dst += d_pitch; > + } > + } > +} Why did you add the multiply back? You have now 3 slightly different variants of the same, which isn't really an improvement. In my example I showed you how to generate the first and last version from the same source. If you also want to optimize for other sizes, you might want to always inline the function, if the function call overhead is the largest part anyway, the special case for 2 bytes might not be needed anymore. BTW this version saves another condition: static inline void __fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height) { int i, j; d_pitch -= s_pitch; i = height; do { /* s_pitch is a few bytes at the most, memcpy is suboptimal */ j = s_pitch; do *dst++ = *src++; while (--j > 0); dst += d_pitch; } while (--i > 0); } bye, Roman - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/