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[Bug middle-end/47379] fwprop1 generates bad codes for x32
- From: "hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 20 Jan 2011 23:28:36 +0000
- Subject: [Bug middle-end/47379] fwprop1 generates bad codes for x32
- Auto-submitted: auto-generated
- References: <bug-47379-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47379
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> 2011-01-20 23:28:32 UTC ---
When fwprop props subreg, it should check
1. If inner register is dead after use.
2. If subreg is used in multi-word operations.
3. If subreg is a paradoxical subreg.