[Bug rtl-optimization/17236] inefficient code for long long multiply on x86

[bonzini at gnu dot org]

------- Comment #12 from bonzini at gnu dot org  2007-12-18 16:01 -------
The problem in comment #11 is that GCC generates a widening multiply, and
cannot remove the DImode operations until after register allocation (!).  While
the root cause is a deficiency in RTL-level DCE, I suggest filing a separate
bug, because it could also be fixed on the tree-level.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17236