http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47581
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
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CC| |matz at gcc dot gnu.org
--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> 2011-02-02 15:05:10
UTC ---
(In reply to comment #8)
> For this tescase, gcc 4.4 generates the most efficient code
> while 4.5/4.6 become worse and worse:
>
> [hjl@gnu-6 gcc]$ cat x.i
> unsigned mulh(unsigned a, unsigned b)
> {
> unsigned long long l __attribute__ ((aligned(32)))
> =((unsigned long long)a * (unsigned long long)b) >> 32;
> return l;
> }
This is caused by revision 146817:
http://gcc.gnu.org/ml/gcc-cvs/2009-04/msg01459.html
