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sign_ext.h: use G_GINT64_CONSTANT(), add sample for alternative method of sign extension. 

Alternative method looks much nicer in dissasembly.

svn path=/trunk/; revision=54202
This commit is contained in:
Jakub Zawadzki 2013-12-17 22:16:06 +00:00
parent e6d09c1634
commit ff2a5847b9
1 changed files with 12 additions and 2 deletions
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14
wsutil/sign_ext.h
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@ -41,10 +41,20 @@ ws_sign_ext32(guint32 val, int no_of_bits)
static inline guint64
ws_sign_ext64(guint64 val, int no_of_bits)
{
if (val & (1LL << (no_of_bits-1)))
val |= (-1 << no_of_bits);
if (val & (G_GINT64_CONSTANT(1) << (no_of_bits-1)))
val |= (G_GINT64_CONSTANT(-1) << no_of_bits);
return val;
} _U_
/*
static inline guint64
ws_sign_ext64(guint64 val, int no_of_bits)
{
gint64 sval = (val << (64 - no_of_bits));
return (guint64) (sval >> (64 - no_of_bits));
}
*/
#endif /* __WSUTIL_SIGN_EXT_H__ */