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From: "kazu at cs dot umass dot edu" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/15458] New: Combine ~ and ^. Date: Sun, 16 May 2004 01:55:00 -0000 [thread overview] Message-ID: <20040515121800.15458.kazu@cs.umass.edu> (raw) unsigned int xornot (unsigned int a) { unsigned int b = a ^ 0xffff; unsigned int c = ~b; return c; } unsigned int notxor (unsigned int a) { unsigned int b = ~a; unsigned int c = b ^ 0xffff; return c; } The last tree-ssa form looks like: ;; Function xornot (xornot) xornot (a) { unsigned int c; unsigned int b; <bb 0>: b_2 = a_1 ^ 65535; c_3 = ~b_2; return c_3; } ;; Function notxor (notxor) notxor (a) { unsigned int c; unsigned int b; <bb 0>: b_2 = ~a_1; c_3 = b_2 ^ 65535; return c_3; } -- Summary: Combine ~ and ^. Product: gcc Version: 3.5.0 Status: UNCONFIRMED Keywords: pessimizes-code Severity: enhancement Priority: P2 Component: tree-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: kazu at cs dot umass dot edu CC: gcc-bugs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15458
next reply other threads:[~2004-05-15 12:18 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2004-05-16 1:55 kazu at cs dot umass dot edu [this message] 2004-05-16 10:02 ` [Bug tree-optimization/15458] " pinskia at gcc dot gnu dot org 2004-05-16 10:49 ` pinskia at gcc dot gnu dot org 2004-05-17 18:53 ` pinskia at gcc dot gnu dot org 2004-06-02 21:14 ` pinskia at gcc dot gnu dot org
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