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[Bug target/42498] GCC can't use smull to compute int * int --> long long
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 31 Dec 2009 15:30:52 -0000
- Subject: [Bug target/42498] GCC can't use smull to compute int * int --> long long
- References: <bug-42498-17659@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #3 from rguenth at gcc dot gnu dot org 2009-12-31 15:30 -------
This is because widening multiplication is not detected if there are
more-than-once used sub-expressions.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42498