[Bug rtl-optimization/31944] [4.1/4.2/4.3 Regression] Endless loop while building a 64-bit 2.6.20 kernel

["steven at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #21 from steven at gcc dot gnu dot org  2008-01-09 22:46 -------
at cse.c:5418:
        elt = insert (dest, sets[i].src_elt,
                      sets[i].dest_hash, GET_MODE (dest));

dest = (reg:DI 66 [ type.0+-4 ])
sets[i].src_elt->exp = (sign_extend:DI (reg:SI 72 [ type ]))
sets[i].dest_hash = 5

and REG_QTY(66) == 5 so everything is OK up to this point.

Later on, REG_QTY(66) is changed.  This means that the original hash of 5 also
changes (the HASH of a reg is its QTY number plus a constant).


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31944

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