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[Bug tree-optimization/41577] Broken code with -O -ftree-vrp
- 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: 5 Oct 2009 12:03:10 -0000
- Subject: [Bug tree-optimization/41577] Broken code with -O -ftree-vrp
- References: <bug-41577-16469@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #7 from rguenth at gcc dot gnu dot org 2009-10-05 12:03 -------
A fix is to write
uint32 res = ((uint32)(uint16)(cpu->gprs[12] >> 16)
* (uint32)(uint16)(cpu->gprs[16] >> 16));
instead to force the multiplication in an unsigned type.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41577