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[Bug tree-optimization/21048] [4.1 Regression] use of poisoned ggc memory causes cpu2000 build failures
- From: "dje at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 15 Apr 2005 23:54:10 -0000
- Subject: [Bug tree-optimization/21048] [4.1 Regression] use of poisoned ggc memory causes cpu2000 build failures
- References: <20050415182741.21048.janis@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From dje at gcc dot gnu dot org 2005-04-15 23:54 -------
debug_immediate_uses() does not seem right after the reciprocal transformation:
BEFORE
D.478_11 : --> single use.
x_14 = D.478_11 / pretmp.3_54;
pretmp.3_54 : -->2 uses.
x_14 = D.478_11 / pretmp.3_54;
D.479_13 = pretmp.3_54;
AFTER
D.478_11 : -->2 uses.
x_14 = D.478_11 * reciptmp.7_42;
x_14 = D.478_11 / pretmp.3_54;
reciptmp.7_42 : --> single use.
x_14 = D.478_11 * reciptmp.7_42;
pretmp.3_54 : -->3 uses.
reciptmp.7_42 = 1.0e+0 / pretmp.3_54;
x_14 = D.478_11 / pretmp.3_54;
D.479_13 = pretmp.3_54;
Why are the original division stmts still present? If the immediate uses still
exist in the list but the statements were overwritten, that might cause problems.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21048