On Mon, Apr 22, 2013 at 11:22 AM, Chanho Min <chanho.min@xxxxxxx> wrote:
+#define HTYPE const u8*
+
+#ifdef __BIG_ENDIAN
+#define LZ4_NBCOMMONBYTES(val) (__builtin_clz(val) >> 3)
+#else
+#define LZ4_NBCOMMONBYTES(val) (__builtin_ctz(val) >> 3)
+#endif
It seems at least m68k and sparc don't have the __builtin_clz() functions:
m68k-allmodconfig (http://kisskb.ellerman.id.au/kisskb/buildresult/8572593/):
ERROR: "__clzsi2" [lib/lz4/lz4hc_compress.ko] undefined!
ERROR: "__clzsi2" [lib/lz4/lz4_compress.ko] undefined!
gcc seems to define __builtin_clz as __clzsi2 in some architecture.
But, kernel doesn't link libgcc.a.
If kernel should use gcc's built-in function without libgcc.a,
do we need to port __clzsi2 to 'arch/*/lib/*'?
That's another option.
So far no one used __builtin_c[lt]z in generic code. We always used
__fls and __ffs.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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