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avutil/libm: fix isnan compatibility hack

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Commit 14ea4151d7 had a bug in that the
conversion of the uint64_t result to an int (the return signature) would
lead to implementation defined behavior, and in this case simply
returned 0 for NAN. A fix via AND'ing the result with 1 does the trick,
simply by ensuring a 0 or 1 return value.

Patch tested with FATE on x86-64, GNU/Linux by forcing the compatibility
code via an ifdef hack suggested by Michael.

Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
This commit is contained in:
Ganesh Ajjanagadde 2015-11-24 21:29:35 -05:00
parent 4f99308ed3
commit 29af74e4e3
1 changed files with 1 additions and 1 deletions
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libavutil/libm.h
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@ -123,7 +123,7 @@ static av_always_inline av_const int avpriv_isnan(double x)
uint64_t v = av_double2int(x); uint64_t v = av_double2int(x);
if ((v & 0x7ff0000000000000) != 0x7ff0000000000000) if ((v & 0x7ff0000000000000) != 0x7ff0000000000000)
return 0; return 0;
return v & 0x000fffffffffffff; return (v & 0x000fffffffffffff) && 1;
} }
#define isnan(x) \ #define isnan(x) \