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[Bug rtl-optimization/31944] [4.1/4.2/4.3 Regression] Endless loop while building a 64-bit 2.6.20 kernel
- From: "steven at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 9 Jan 2008 22:46:43 -0000
- Subject: [Bug rtl-optimization/31944] [4.1/4.2/4.3 Regression] Endless loop while building a 64-bit 2.6.20 kernel
- References: <bug-31944-8932@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot 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