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[Bug optimization/3507] appalling optimisation with sub/cmp on i386
- From: "kazu at cs dot umass dot edu" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 4 Jan 2004 08:26:42 -0000
- Subject: [Bug optimization/3507] appalling optimisation with sub/cmp on i386
- References: <20010701091600.3507.75773-quiet@bugs.debian.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From kazu at cs dot umass dot edu 2004-01-04 08:26 -------
Replacing a < b with (long) c < 0 sounds like a CSE type of work
but does not quite fit in the current framework of replacing
expensive expressions with cheaper equivalents that are already available.
That is, nobody has computed (long) c < 0 before, so it's not available.
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What |Removed |Added
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CC| |kazu at cs dot umass dot edu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3507